72 results about "Caprock" patented technology

The present invention discloses a method for overall exploration of a mature exploration area of oil-rich sags, the method including the following steps: building an area-wide seismic sequence framework for a study area based on uniform 3D seismic data of the study area; determining the spatial distribution characteristics of sedimentary reservoirs in the study area by sequence based on the area-wide seismic sequence framework; grading source rocks in the study area by sequence based on the area-wide seismic sequence framework: counting the spatial distribution characteristics of caprocks in the study area; determining a transporting system for the study area based on the unified 3D seismic data of the study area; classifying potential trap areas in the study area based on the spatial distribution characteristics of the sedimentary reservoirs and the spatial distribution characteristics of the caprocks; and deploying the overall exploration of the study area based on the classification of the potential trap areas, grading of the source rocks and the transporting system of the study area.

The invention discloses a method for evaluating the sealing capacity of an oil and gas field reservoir serving as a CO2 storage body at the middle and later periods of oil and gas field exploitation. According to the method, to overcome the defects of the prior art and solve the problems existing in the prior art, based on deep geological research of the storage body, the difference between the reservoir and an overlying strata is considered, a geology evaluating mark set is established and corresponds to log response characteristics, and then the problems existing in CO2 storage evaluation are solved within the oil field spreading range. The method for evaluating the CO2 geological storage body is based on geology evaluating marks and the log response characteristics and comprises the steps of (1) researching various geology evaluating mark parameters of the reservoir and the overlying strata of the geological storage body, (2) establishing the corresponding relation between the geology evaluating marks and the log response characteristics, (3) analyzing the main difference between the reservoir and the overlying strata on lithology and physical property and the cause of the difference, and (4) establishing the technological standard and method for evaluating the CO2 geological storage body of a certain oil field.

The invention relates to a method and device for predicting the favorable distribution and growth range of a conventional tight sandstone gas reservoir. The method includes: determining the main controlling factors of the conventional tight sandstone gas reservoir in a research area, wherein the main controlling factors include a hydrocarbon kitchen, a palaeohigh, a favorable sedimentary facies belt and a regional caprock, with the hydrocarbon kitchen, the palaeohigh, the favorable sedimentary facies belt and the regional caprock appearing sequentially from the bottom up at a reservoir forming position; determining the reservoir controlling scopes of the main controlling factors; drawing a target stratum porosity planar graph; and taking the region with a porosity of less than 12% as the force balance boundary to perform restriction, superimposing the reservoir controlling scopes of the main controlling factors of the conventional tight sandstone gas reservoir on the target stratum porosity planar graph, thus obtaining the overlapping region as the most favorable growth range of the conventional tight sandstone gas reservoir. The technical scheme provided by the invention can acquire the favorable distribution and growth range of the conventional tight sandstone gas reservoir more objectively and accurately, and is of great guiding significance to exploration of conventional tight sandstone gas.

The invention discloses a high-pressure nuclear magnetic resonance CO2 geological storage model test system. A load control system is connected with a sample visualization observation system through a pipeline. A fluid control system is connected with a core holding unit in the sample visualization observation system through a fluid injection pipeline. An axial pressure sensor and a confining pressure sensor in a data collecting and processing system are installed on a pipeline connecting an axial pressure pump in the load control system with the core holding unit and a pipeline connecting a confining pressure pump in the load control system with the core holding unit respectively. A left water pressure sensor and a right water pressure sensor in the data collecting and processing system are installed on a pipeline connecting a left salt water injection pump in the fluid control system with the core holding unit and a pipeline connecting a right salt water injection pump in the fluid control system with the core holding unit respectively. An injection air pressure sensor and a flow meter in the data collecting and processing system are installed on a pipeline connecting a CO2 injection pump in the fluid control system with the core holding unit. By means of the high-pressure nuclear magnetic resonance CO2 geological storage model test system, the transport law of CO2 in reservoirs and cap rock on the conditions of different temperatures, different vertical stresses and different horizontal stresses and the deformation and fracture law of the reservoirs and the cap rock are researched.

Methods and an alarming system for long-term carbon dioxide sequestration in a geologic reservoir are described. The geologic reservoir may be a water filled sandstone reservoir or a carbonate reservoir. A reservoir model is constructed to show the effects of varying injection pressures, the number of injection wells, the arrangement of injection wells, the boundary conditions and sizes of the reservoir on caprock uplift, fracture formation and fracture reactivation. The alarming system generates an alarm when caprock uplift that surpasses a threshold is detected. The injection pressures and the number of injection wells operating may be varied in response to the alarm.

A cementless downhole completion system including an annular barrier with a tubular metal part being mounted as part of a first well tubular metal structure arranged in a borehole in a formation and the annular barrier is arranged opposite an impermeable cap layer in the formation. A downhole completion system for completing a well having a top, comprising a formation comprising a cap layer, a borehole extending through the cap layer to provide an inner cap layer face and, a first well tubular metal structure arranged in the borehole comprising a first annular barrier and a second annular barrier. In the expanded position, the expandable tubular of the first annular barrier overlaps the cap layer and the expandable tubular of the second annular barrier overlaps the cap layer.

The invention particularly relates to a device and a method for monitoring leakage of a carbon dioxide geological storage cap layer. The device for monitoring leakage of the carbon dioxide geologicalstorage cap layer comprises a monitoring well, a carbon dioxide gas capturing device and an isotope mass spectrum analyzer, wherein a gas collecting port is formed in a well mouth of the monitoring well; the monitoring well is positioned in a main stress concentration area of the cap layer, a reservoir fracture development area, a high point position of a geological structure and a well site wherea gas injection well is positioned; the carbon dioxide gas capturing device is connected with the gas collecting port and is used for capturing carbon dioxide gas collected by the gas collecting port; and the isotope mass spectrum analyzer is used for analyzing contents of carbon isotopes 13C and 12C in the carbon dioxide captured by the gas collecting port without gas injection and after gas injection. According to the device and the method, the sign that the carbon dioxide breaks through the cap layer and leaks upwards can be accurately, timely and effectively found, possible leakage pathsof the carbon dioxide in the reservoir are monitored, and safety early warning is given when the carbon dioxide does not leak to the shallow earth surface.

The invention discloses a CO<2> geological storage method and a CO<2> geological storage system. The method comprises the following steps that a CO<2> reservoir stratum and a cover layer are determined according to a geological environment; a CO<2> injection well and a salt water extraction well are excavated, and the CO<2> injection well and the salt water production well both communicate with the CO<2> reservoir stratum; CO<2> is injected into the CO<2> reservoir stratum through the CO<2> injection well, meanwhile, salt water in the CO<2> reservoir stratum is extracted through the salt water extraction well, the pressure of the CO<2> reservoir stratum is reduced, and the pore available space of the CO<2> reservoir stratum is increased; and the CO<2> is stored in the CO<2> reservoir stratum in a sealed mode; According to the method, the salt water extraction well is excavated while the CO<2> injection well is excavated, CO<2> is injected into the CO<2> reservoir stratum through the CO<2> injection well, and meanwhile salt water in the CO<2> reservoir stratum is extracted through the salt water extraction well, so that the pressure of the CO<2> reservoir stratum is reduced and the pore available space of the CO<2> reservoir stratum is increased, and therefore the storage coefficient of the CO<2> reservoir stratum can be remarkably increased, and then the total storage amount of the CO<2> reservoir stratum is increased, namely, the sealing capacity of the CO<2> reservoir stratum is improved.

The invention provides a method for blocking leakage along an abandoned well in the geological storage process of carbon dioxide. The method comprises the following steps that perforating is carried out by adopting a stable cover layer above a geological storage layer of carbon dioxide; a shaft with leakage risk, drilling annular cement and a surrounding rock fracture zone communicate with one another; and lime milk turbid liquid is injected into a perforation interval, so that lime milk in a gap reacts with leaked carbon dioxide to form hardened and compact calcium carbonate, and a carbon dioxide leakage channel is blocked. According to the method for blocking leakage along the abandoned well in the geological storage process of carbon dioxide, the crack channel leaking along the abandoned well in the geological storage process of carbon dioxide can be effectively blocked, meanwhile, a surrounding rock broken zone and crack-containing drilling well annulus cement can be cemented into a compact whole, and the risk of leaking along the abandoned well in the geological storage process of carbon dioxide is greatly reduced. The injected lime milk turbid liquid reacts with carbon dioxide leaked along the abandoned well to generate common calcium carbonate and water in the stratum, the geological environment pollution risk is extremely low, and the plugging process is safe and environmentally friendly.

The invention discloses an effective geophysical method for finding shallow sandstone type uranium mine within 800m, which comprises four methods, and is characterized in that the first method is a controllable source audio magnetotelluric method, the second method is a gamma energy spectrum measurement method, the third method is a soil natural thermoluminescence measurement method, and the fourth method is a <210>Po method; the sandstone-type uranium ore can be found through the combination of the four methods. The method has the beneficial effects that the difference between the resistivityof the substrate and the resistivity of the cover layer in a research area is large, the substrate can be inferred according to a CSAMT method, and the substrate structure and intruding rock mass distribution can be further inferred by combining geological conditions; the distribution range of shallow ancient riverways with the burial depth of 800m or less between the southeast part of Ulanqab depression and the southwest part of Qiharigetu and the Saihan group of Saihangaobi can be delineated, and the prospecting space of ancient riverway sandstone type uranium deposit (PCSTU) ore deposits is broadened.

The invention belongs to the technical field of oil and gas resource geological exploration, and discloses a quantitative characterization method, system and equipment for comprehensive geological evaluation of an oil and gas exploration zone. The method comprises the steps: comprehensively analyzing geological factors of hydrocarbon source conditions, reservoir conditions, cap stratum conditions,trap conditions and reservoir forming conditions of the found oil and gas reservoirs in the oil and gas exploration zone through an oil and gas reservoir fine dissection technology, and defining oiland gas reservoir forming main control factors and enrichment rules; determining the weight of each geological condition subitem index parameter according to the quality evaluation standard of the reservoir forming geological conditions, and performing assignment; and determining the grade of geological comprehensive evaluation according to the comprehensive score of each geological condition. Thesystem comprises a geological element analysis module; a parameter weight assignment module; and a geological grade evaluation module. The method can meet the requirement for quantitative characterization of geological evaluation of the oil and gas exploration zone, is good in application effect and easy to operate, is popularized and applied to other oil and gas exploration zones, and particularly provides a basis for oil and gas exploration potential evaluation and exploration zone prediction.

The invention provides a method for judging and identifying structure damaged type ancient oil reservoirs, and belongs to the technical field of oil and gas exploration. Starting from the causes of the ancient oil reservoirs, vertical storage conditions of oil and gas are determined by evaluating fault-caprock configuration relationships in different periods, and further formation positions of the ancient oil reservoirs are identified. The method comprises the following steps: in a target layer of a research area, selecting a plurality of measuring points uniformly covering a fault in a research area range; calculating a fault mudstone ratio lower limit value SGRlim corresponding to each measuring point according to logging, drilling and seismic data of the research area; according to the logging, drilling and seismic data of the research area, calculating a reservoir-forming-stage fault mudstone ratio SGR(ancient) corresponding to each measuring point; calculating a current fault mudstone ratio SGR(current) corresponding to each measuring point according to the logging data of the research area; and when the SGR(ancient) corresponding to each measuring point is greater than the SGRlim and the SGR(current) is less than the SGRlim, indicating that the ancient oil reservoirs exist at the measuring point.

The invention discloses a natural gas hydrate geological stratification device. The natural gas hydrate geological stratification device comprises a reaction kettle which is disposed in a thermostaticwaterbath. The reaction kettle comprises an upper kettle cover, a lower kettle cover and a kettle body. The upper kettle cover and the lower kettle cover are sealed and closed at the two ends of thekettle body so as to form a closed cavity. An overlying pressure layer, an upper cover layer, a hydrate layer and a lower cover layer are sequentially formed in the cavity from the upper kettle coverto the lower kettle cover. Each layer is filled with different porous media and fluid and is further provided with an annular formation fluid container. The outer ring circumference of each annular formation fluid container makes contact with the inner wall of the kettle body. The method is executed with the natural gas hydrate geological stratification device. The natural gas hydrate geological stratification device is used for simulating the layered condition of hydrate in a reservoir, and the amount of stratum make-up fluid of different strata in the forming process of the hydrate can be studied.

The invention relates to a method for evaluating the effectiveness of overlying strata. The method comprises the following steps: dynamically evaluating the effectiveness of the overlying strata by adopting macroscopic indexes; evaluating the effectiveness of the overlying strata by adopting microscopic indexes; and evaluating the effectiveness of the overlying strata by adopting stratum water chemistry and stratum water organic geochemical indexes. According to the method, the effectiveness of the overburden is qualitatively researched according to macroscopic factors such as rock stratum lithology, burial depth, thickness and distribution of different structural parts, and then the closure of the overlying strata is quantitatively evaluated by combining microscopic research according tobreakthrough pressure and the content of ultramicropores less than 2.5 nm, and finally, the separation effect of the overlying strata on the stratum water is analyzed by combining the stratum water chemical characteristics, thereby finally realizing macroscopic-microscopic-hydrochemical three-in-one comprehensive evaluation of the effectiveness of the overlying strata.

The invention discloses a comprehensive brittleness evaluation method of supracrustal rocks of gas storage, and belongs to the technical field of rock brittleness evaluation. Firstly, the brittleness of a collected rock sample is evaluated on the basis of brittleness evaluation methods respectively based on a stress-strain curve, hardness and mineral composition; then the weighted value of the three brittleness evaluation methods is calculated by means of a weight back analysis method based on optimization theory; finally, comprehensive evaluation on the brittleness of the supracrustal rocks of gas storage is carried out. The method effectively solves a problem of limitation of single brittleness evaluation method in the prior art and has excellent practicability and high evaluation reliability. The collected rock sample has multiple applications, so that test cost is low.

The invention provides a dynamic sealing performance evaluation method for an oil reservoir type gas storage cover layer. The method comprises the following steps of: S1, preparing a rock core sample; S2, loading the sample into an experimental device; S3, recording a change value of gas pressure attenuation along with time; S4, calculating the diffusion coefficient of the rock sample; S5, calculating the permeability of the rock sample; S6, recording the change data of the pressure difference along with time under cyclic loading and unloading; and S7, establishing a permeability and diffusion coefficient and period model under multi-period operation. According to the method, the technical blank of dynamic sealing performance evaluation of the oil reservoir type gas storage cover layer at present is filled, the establishment process conforms to the actual operation process of the oil reservoir type gas storage, and the dynamic sealing performance of the oil reservoir type gas storage cover layer can be accurately evaluated.

The invention provides a rock overpressure fracture identification index determination method, a rock overpressure fracture identification index determination device, a rock overpressure fracture identification index determination method, a rock overpressure fracture identification index determination device and a storage medium, the rock overpressure fracture identification index determination method comprises the following steps: inputting rock fracture measured data into a trained machine learning model to obtain an additional tectonic stress coefficient, determining a rock overpressure fracture identification index based on the additional tectonic stress coefficient, and determining the rock overpressure fracture identification index according to the determined rock overpressure fracture identification index. And based on the rock fluid pressure coefficient and the overpressure fracture pressure coefficient, whether overpressure fracture happens to the rock or not is judged. The influence of additional tectonic stress is considered, the overpressure fracture condition of the rock is reflected more accurately, and key technical parameters are provided for cover layer integrity evaluation in conventional oil and gas reservoir-forming preservation condition research and hydraulic fracturing in shale gas development.

The invention provides a method and device for analyzing the brittle cover layer closeness of a fault block entrapment, and the method comprises the steps: building a fault model of a target brittle cover layer section in a brittle cover layer section of a fault block entrapment of a sand-mudstone interbed stratum, and determining the lithological attributes of each layer section in the fault model; according to a preset sandstone filtering window size and the lithology attribute of each layer section, determining a calculation mode of a cover layer sealing factor of each layer section, and based on the calculation mode, calculating the cover layer sealing factor of each layer section; and according to the capping layer sealing factor of each layer section and the target brittle capping layer section sealing factor threshold value, achieving capping layer sealing performance analysis of the target brittle capping layer section on the section. The method and device can analyze the sealing performance of the brittle cover layer on the section, and are high in accuracy.

Methods and an alarming system for long-term carbon dioxide sequestration in a geologic reservoir are described. The geologic reservoir may be a water filled sandstone reservoir or a carbonate reservoir. A reservoir model is constructed to show the effects of varying injection pressures, the number of injection wells, the arrangement of injection wells, the boundary conditions and sizes of the reservoir on caprock uplift, fracture formation and fracture reactivation. The alarming system generates an alarm when caprock uplift that surpasses a threshold is detected. The injection pressures and the number of injection wells operating may be varied in response to the alarm.

The invention discloses a method for improving the recovery rate of natural gas hydrate reservoirs through artificial dense caprocks, which is mainly aimed at producing large water production volumes in production wells when exploiting natural gas hydrate reservoirs with permeable top caprocks and permeable bottom caprocks. , Small hydrate decomposition range, poor development effect, etc., by injecting cement slurry into the permeable caprock to form an artificial dense caprock, it can effectively prevent seawater from entering the hydrate layer in large quantities during decompression mining, and effectively increase the hydrate layer The production pressure difference between the production well and the production well, thereby increasing the rate of hydrate decomposition and recovery; the injected cement slurry has high strength after solidification, which can prevent geological disasters such as reservoir collapse caused by hydrate decomposition; The layer can also effectively prevent the migration of decomposed methane gas into the atmosphere through the permeable cap layer. The well structure of the invention is simple, easy to operate and highly economical, and can provide technical means for efficient exploitation of natural gas hydrate reservoirs with permeable cap rocks.

A kind of CO 2 The evaluation method of the leakage risk area during the geological storage process uses the principle of sedimentary microfacies constraint, how to obtain the rock mechanical parameters of the caprock, and select a suitable fracture pressure prediction model to evaluate the mechanical sealing of the caprock, using fine geological models and numerical values. Model, applying reservoir numerical model theory, and in-depth study of CO through the established storage volume numerical model 2 Injection process until storage for 200 years to store pressure and CO in the body 2 Dynamic changes in saturation. Using the concepts of fluid potential and potential gradient in oil and gas migration theory combined with CO 2 Saturation dynamic distribution analysisCO 2 migration direction and accumulation area, and then according to the CO in the storage body 2 The migration direction and distribution characteristics of the storage body and sand body boundary are combined to conduct lateral CO 2 Leakage risk prediction; Based on the rupture pressure distribution characteristics of the caprock and the dynamic distribution characteristics of the pressure in the storage body, CO is quantitatively studied through the proposed identification formula of the caprock rupture risk area. 2 Possible leakage risk areas longitudinally along the migration path. This method is used in low permeability reservoir CO 2 It has important practical application value to achieve safe and efficient carbon sequestration during oil displacement.

The invention relates to an experimental device used for studying the influences of sandwich layers on SAGD mining of a dual horizontal well. The experimental device comprises a device body and a maincontrol unit, wherein the device body comprises an experimental device box, an SAGD well group mould, a sandwich layer mould device, a sandwich layer mould, a groove, a sandwich layer mould device interface, an outer ring seal, an inner ring insertion opening, a sandwich layer mould insertion channel, a heat insulation device, a mudstone cap rock device and a temperature sensor; the main controldevice comprises a data processing module, a data visualization module, a data analyzing module, a steam generation device and the like; the experimental device further comprises other small parts, such as oil drawing devices, pipelines, pressure gages, flow meters, switches, beakers, steam holes and a crude oil reservoir. The experimental device can simulate the influences of the sandwich layerswith different physical properties, different widths, different angles and different opening degrees on SAGD mining of the dual horizontal well, the SAGD mining way can be monitored and adjusted by the main control device, the application range is greatly widened, and the accuracy is greatly improved.

The invention relates to the technical field of geological engineering, in particular to a comprehensive test platform for dynamic sealing performance of gas storage cover rock. The comprehensive test platform is formed by connecting a triaxial alternating mechanical control system, a temperature loading system, a gas pressurization system, a rock core saturation loading system, a seepage outlet monitoring system, an acoustic detection system and a data acquisition and display system through a high-pressure connecting pipeline, a valve and a circuit system. On one hand, the platform is provided with a temperature and confining pressure loading system and a vacuumizing and saturation system, temperature, confining pressure and formation water simulation under the formation condition can be achieved, and on the other hand, stress alternation during gas storage injection-production alternation can be simulated by adopting a stress control technology; on the other hand, an advanced flowmeter or an optical fiber type sensor can be adopted to collect permeability or breakthrough pressure data in real time.

The invention relates to the technical field of oil and gas exploration, and provides a quantitative evaluation method for the vertical distribution ratio of oil and gas under the condition of fault-cap configuration; it sets evaluation faults from two perspectives of migration and preservation according to four aspects: macroscopic, microscopic, space, and time. ‑Cap (fault and caprock) configuration relationship parameters, on the basis of clarifying the degree of oil and gas enrichment in different formations of each well, determine the mathematical relationship between each parameter and the vertical oil and gas split ratio between the upper and lower caprocks, and then clarify the fault‑ The control effect of the cover configuration on the longitudinal distribution of oil and gas. The invention is suitable for research areas containing oil and gas in multi-layer systems. Under the condition that the oil and gas charging conditions, reservoir conditions and other accumulation factors are basically the same, according to the quantitative evaluation of the fault-cap configuration relationship, the vertical diversion effect of the fault-cap configuration on oil and gas, and the deployment of vertical oil and gas exploration strata are clarified. is of great significance.

The invention belongs to the technical field of petroleum exploitation, and relates to how to quantitatively estimate covering layer sealing performance in processes of carrying out a CCUS project. Acovering layer sealing performance prediction method of the Ordos basin is provided and comprises steps of selecting a production well of a to-be-estimated region, and reading the starting depth valueX1 and the thickness of a long 4+5 covering layer on a well logging curve; carrying out segmentation and fitting the interval transit time curve of the long 4+5 covering layer, and calculating the interval transit time value corresponding to the interval transit time curve; and substituting the read thickness value h and the corresponding interval transit time of the long 4+5 covering layer intoa formula, calculating a composite displacement pressure value P and evaluating the sealing performance of the covering layer by use of the P. According to the invention, the prediction method is simple and convenient; it can be avoided that a plenty of time and cost are used for obtaining horizontal displacement pressure and vertical displacement pressure through a high-pressure mercury intrusionmethod or a breakthrough pressure method; and inaccuracy caused by that fact the horizontal displacement pressure measured by the high-pressure mercury intrusion method or the vertical displacement pressure measured by the breakthrough pressure method is used as an index to measure the sealing performance of the covering layer can be avoided.

The invention discloses an optimization method and system for an exhaustion type oil and gas reservoir target region based on seismic exploration. The optimization method comprises the steps of: acquiring three-dimensional seismic data; performing horizon calibration and drilling geology recovery to obtain a seismic geologic structure interpretation scheme; establishing a speed model; performing plugging performance analysis on a fault to obtain plugging performance data of the fault; performing sealing analysis on a cover layer to obtain sealing data of the cover layer; evaluating and analyzing a target region and a well trajectory scheme of a phase storage well through coherent slices to obtain an initial target region; and selecting a target region in the initial target region according to optimal parameters to obtain a final target region. According to the optimization method and the system, the sealing performance of the target gas reservoir cover layer of a gas storage, the plugging performance of the fault and the quality and connectivity of the reservoir can be visually reflected, the target region is optimized, the problems of the sealing performance of the decisive layer and the sealing performance of the cover layer are effectively solved, meanwhile, a large crack system can be predicted, and powerful guarantee is provided for gas storage construction.

The invention proposes a method for constructing a three-dimensional conceptual model of traps and reservoirs, constructing fault lines, assigning elevation values ​​to fault lines, and using fault lines to create fault planes, converting fault planes into faults in corresponding models; creating fault-free According to the fault throws of different faults, the corresponding structural planes are constructed. According to the faults, the structural planes are divided into the structural planes of each fault block. The sandstone top surfaces of different fault blocks are combined into one structural plane. Layer top structural map; set sandstone pinch-out area, construct sandstone isopach map, use sandstone top surface and sandstone isopach map to construct sandstone bottom structural surface; use caprock top surface, sandstone top surface and sandstone bottom surface to construct three-dimensional trap structure The three-dimensional lithological attributes are constructed in the model; on the basis of the three-dimensional trap structure model, the oil-water interface is set, and the corresponding lithological attributes and fluid attributes are created. The above method can quickly and accurately establish three-dimensional trap and reservoir models.

The invention belongs to the field of tectonic geology and petroleum geology, and discloses a method for recovering paleo-water depth of a broken basin, which comprises the following steps of: recovering stratum paleo-thickness by using compaction correction and current thickness; determining a fault slippage distance recovery breakpoint position according to fault activity analysis; according to an area conservation principle, recovering the position of the ancient shoreline point; calculating an ancient slope angle according to the recovered breakpoint and the position of the ancient shoreline point; and calculating the paleo-water depth according to the paleo-slope angle and the horizontal distance to the shoreline. The establishment of the method fully considers how to recover the breakpoint position, including two conditions of denudation and retention of the ascending disc stratum, and has important significance for the deposition history of the ancient sedimentary basin, determination of the deposition system type, evaluation of the conditions of generation, storage and cap strata and the like.