42 results about "Stratigraphy" patented technology

Methods and systems are provided for displaying and forecasting the lithology and wellbore conditions to be encountered while conducting drill string operations in a wellbore. A method and system is described for predicting and modeling lithology while operating a drill string in a wellbore, comprising: developing a 3-D lithological model of a subsurface area; projecting a well path through said subsurface area; determining an open cylinder lithology display of said projected well path; and recording said determined open cylinder display. The open cylinder lithology display (the Predictive Stratigraphy Image) may be displayed with geological or structural cross-sections to compare the well path and the predicted well path, with the actual subsurface environment. Data acquired during drilling operations can be used in real time to update the model or the Predictive Stratigraphy Image, and the results compared with Predictive Image Logs and other wellbore images and data.

An earth model is formed in real time during drilling of a well by incorporating up-to-the-minute knowledge derived from geology, seismic, drilling, and engineering data. The process of forming the model utilizes Logging-While-Drilling (LWD) or Measuring-While-Drilling (MWD) data directly from the drilling rig as the well is drilled. The LWD or MWD data is sent to visualization centers and compared with other data such as existing geological models, the proposed well plan and present interpretation of the subsurface stratigraphy. The results of the comparison enable experts to analyze anomalous results and update the geological model within minutes of penetration of a formation during drilling. Well drilling efficiency is improved, and an “on-the-spot” road map is provided for maximal reservoir contact and pinpoint accuracy.

Methods and systems are provided for displaying and forecasting the lithology and wellbore conditions to be encountered while conducting drill string operations are conducted in a wellbore. A method and system is described for predicting and modeling lithology while operating a drill string in a wellbore, comprising: developing a 3-D lithological model of a subsurface area; projecting a well path through said subsurface area; determining an open cylinder lithology display of said projected well path; and recording said determined open cylinder display. The open cylinder lithology display (the Predictive Stratigraphy Image) may be displayed with geological or structural cross-sections to compare the well path and the predicted well path, with the actual subsurface environment. Data acquired during drilling operations can be used in real time to update the model or the Predictive Stratigraphy Image, and the results compared with Predictive Image Logs and other wellbore images and data.

The present invention relates to a method for updating a stratigraphic model according to measurements performed in a basin. The method comprises steps of: i) determining at least a first spatial distribution of the values of an attribute representative of the basin stratigraphy, and applying a classification method for converting the first spatial distribution to a first classified image; ii) performing a stratigraphic simulation with first parameter values of the simulation, deducing therefrom a second spatial distribution of the values of the attribute and applying the same classification method identically to determine a second classified image; iii) determining a distribution of local dissimilarities between the first and second classified images, and modifying the values of at least one of the stratigraphic simulation parameters to minimize an objective function formed from at least the local dissimilarity distribution; and iv) updating the stratigraphic model by performing at least one stratigraphic simulation with the modified simulation parameter values.

The invention provides a map series and technical method for construction of a continental sequence stratigraphic framework. The method includes the specific steps that in the aspect of 'points', drilling data is given priority to, and a single-well analysis map series and a mapping method are determined; in the aspect of 'lines', based on a connecting-well profile and a seismic profile, a map series and mapping method of the 'lines' are determined; based on research results of 'points and lines', according to a plane figure, a map series of 'surfaces' is determined; by means of a three-dimensional data body, through the combination with sequence stratigraphic 'body' research, a map series and mapping method of the 'body' are determined; by means of time data, based on the spatio-temporal evolution of sequence stratigraphy, a map series and technical method of the sequence stratigraphic 'body' are determined, and finally a sequence stratigraphic framework drawing is formed. By means of the method, mapping is started, a standard industrial drawing is formed, the map series and technical method can be directly used for guiding oil and gas exploration, the application effect of research results is improved, exploration risks are avoided, and exploration costs are reduced.

The invention discloses a multi-dimensional dynamic formation fold demonstration model device, which belongs to the field of geology model demonstration devices. The multi-dimensional dynamic stratigraphy fold demonstration model device comprises a base; a horizontal displacement adjustment mechanism is arranged on the base; the upper end of the horizontal displacement adjustment mechanism is provided with an adjustable mobile support capable of controlling displacement of a stratigraphic region; the upper end of the adjustable mobile support is provided with the stratigraphic region processed and formed through plastic material; displacement of the adjustable mobile support can be driven via the horizontal displacement adjustment mechanism; and the adjustable mobile support drives the stratigraphic region to be squeezed and deformed. An inflexible and abstract previous fold structure geologic model demonstration process can be avoided, a spatial change, a force-bearing process and a development result of the fold happening process are represented intuitively, and the multi-dimensional dynamic stratigraphic fold demonstration model device can be applied to teaching demonstration for college mineral and geology specialty and popular science education demands for children.

The invention relates to a method for identifying hidden faults in complex fault-block basins. The identification method includes the following steps: 1) establishing a stratum model based on rock physical parameters, performing forward modeling on the stratum model, and determining geological factors that affect the identification of hidden faults ; According to the formation and fault occurrence in the target area, determine the principal stress direction, adjust the survey line direction of the seismic data to be perpendicular to the principal stress direction, and obtain the seismic data body; 2) perform fault enhancement processing on the seismic data volume; 3) extract fault enhancement Variance attribute of seismic data volume; 4) Occurrence constraint filtering is performed on variance attribute, and then merged with fault-enhanced seismic data volume, and hidden faults are identified according to the fusion result. The method for identifying hidden faults in complex fault-block basins provided by the present invention solves the problem of identifying small-scale hidden faults mixed with formation factors through steps such as fault enhancement processing, extraction of variance attributes, and occurrence constraint variance attributes.

The invention discloses a method for depicting the relationship between horizontal well track and strata, comprising the following steps: (1) acquiring the position information of a horizontal well on an oil and gas reservoir structure to get a geological data body of an area where the horizontal well is located; (2) standardizing the well logging curve of vertical wells and pilot hole wells in the area where the horizontal well is located; (3) performing stratigraphic comparison to determine the top and bottom limits of a drilling target stratum of the horizontal well, and building a target stratum top and bottom structure model; (4) selecting a vertical well adjacent to the horizontal well, and conducting multi-well fine sand body comparison to form a sand body fence diagram; (5) building a 3D sand body model; (6) collecting sand body slices along the horizontal well track in the 3D sand body model to get an initial model of the relationship between horizontal well track and strata; and (7) correcting sand body slices around the horizontal well track to realize visual representation and fine depiction of the relationship between horizontal well track and strata. By using the method, fine depiction of the relationship between horizontal well track and strata is realized.

The invention discloses a stratigraphic correlation method and a system for a petroliferous basin. The method comprises the steps of dividing a petroliferous basin into a plurality of deposition systems; conducting the stratigraphic correlation successively for each deposition system based on the isolithology correlation method, and also conducting the stratigraphic correlation for the deposition system based on the isochronous correlation method so as to obtain an isochronous-sequence stratigraphic framework of the deposition system; based on the isochronous-sequence stratigraphic frameworks of all the deposition systems, obtaining a comprehensive-sequence stratigraphic framework. According to the invention, the novel stratigraphic correlation technique with each deposition system as a unit is adopted. Different stratigraphic correlation methods are adopted for the same deposition system in the basin and different deposition systems in the basin. Meanwhile, the isolithology correlation of the traditional stratigraphy and the isochronous correlation of the sequence stratigraphy are combined for comprehensive analysis. Therefore, the stratigraphic correlation problem in the same deposition system and the stratigraphic correlation problem among different deposition systems can be effectively solved. As a result, exploration errors caused by stratigraphic correlation faults can be avoided.

The invention discloses a seismic geology identification method of a coal-bed gas dessert zone based on a seal-up unit and a rough set. According to characteristics of composition factors of the seal-up unit, pre-stack / post-stack seismic data is used to implement integrated seismic geology interpretation of coal system stratum construction, lithology and rock elasticity and physical parameters aswell as integrated analysis on sequence stratigraphy, seismic stratigraphy, seismic sedimentology and coal-bed gas geology; different information complement one another; and a rough set identificationtheory is used to discriminate the composition factors in an integrated way, and a coal-bed gas desert zone is identified. Research on change characteristics of the coal bed itself are converted intoresearch on construction, deposition and lithology change which has effect on coal-bed gas migration in vertical and horizontal directions of the coal system, the rough set is introduced into an extended identification method, the identification process is less relied on experience, interference of artificial factors is avoided, the coal-bed gas dessert zone is identified more reliably, and the practical application value is high.

The invention discloses a method for judging the age of petroleum source rocks by comparing evaporite and petroleum sulfur isotopes, comprising the following steps: S101, collecting sulfate samples in evaporite strata and performing sulfur isotope analysis to obtain the sulfur isotope of evaporite strata Data; S102. Collect carbon isotope samples in carbonate strata interbedded with evaporite strata and conduct carbon and oxygen isotope analysis, and then conduct carbon isotope stratigraphic studies to determine the geological age of evaporites; S103. Based on evaporation Sulfur isotope data of rock formations and the geological age of evaporite rocks to improve the international sulfur isotope curve; S104. Analyze sulfur isotope in oil and obtain sulfur isotope data of oil; S105. Combine sulfur isotope data of oil with sulfur isotope data of evaporite formations For comparison, and combined with the international sulfur isotope curve to determine the geological age of petroleum source rocks.

The invention belongs to the field of sedimentary stratigraphy, and relates to a method for analyzing cycle strata based on a lithological midpoint sinusoidal interpolation model. The method for analyzing the cyclic strata based on the sinusoidal interpolation model of the lithological midpoint in the present invention calibrates the middle points of different lithological units on the section of the cyclic stratum, and uses the middle points of different lithological units to indicate the periodic fluctuation of the original depositional signal Features; the method for analyzing cycle strata based on the lithology midpoint sinusoidal interpolation model in the present invention avoids the boundary problem of different lithology units, thus it is not necessary to discuss the material transfer and compaction of lithology boundaries in the diagenesis process, and can It effectively solves the problem of a large number of interference signals generated by the rectangular wave sequence established based on the lithological boundary model, highlights the target astronomical signals in the frequency domain, and improves the simulation matching effect of the original sediment and astronomical signals.

The invention provides an exploration method, system, computer equipment and computer-readable storage medium for lithological oil and gas reservoirs in faulted basins, and relates to the technical field of lithological oil and gas reservoir exploration. The method includes dissecting the oil and gas layers of the target strata of the developed oil and gas reservoirs, and dividing and obtaining multiple oil and gas reservoir units; determining the accumulation mechanism information corresponding to the oil and gas reservoir units according to the oil and gas reservoir units; and analyzing the multi-layer system according to the accumulation mechanism information The oil and gas reservoir unit determines the enrichment model information of the complex oil and gas reservoir; performs zone evaluation according to the accumulation mechanism information and the enrichment model information, and predicts the exploration direction of the lithologic oil and gas reservoir. The invention solves the technical problem that sequence stratigraphy and conventional reservoir prediction techniques are not suitable for finding small and medium-sized lithologic oil and gas reservoirs in faulted basins at the stage of high exploration degree, and lays a foundation for the efficient exploration and development of such lithologic oil and gas reservoirs.

The invention discloses a quantitative characterization method of a low-stand continental shelf edge delta, comprising the following steps: selecting a profile of a target delta, and dividing the third-order sequence boundary of the target delta by using an earthquake termination relationship based on the classic sequence stratigraphy theory; In the third-level sequence interface, identify the first super-upper point, the first lower-superior point of the initial flooding surface on the third-level sequence interface, and the point where the angle of the initial flooding surface changes the most; read Take the time values ​​of the above three points, and use the time-depth conversion formula to convert them into depth values; calculate the accretion distance of the delta according to the depth values; calculate the progress of the delta according to the plane positions of the above three points. calculating the slope of the delta according to the accumulation distance and the progradation distance; determining the type of the delta according to the calculation result of the slope. The invention can quantitatively classify the types of deltas at the edge of the low-stand continental shelf, and provide technical support for deep-water sediment research.