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1666 results about "Lithology" patented technology
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The lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples, or with low magnification microscopy. Physical characteristics include colour, texture, grain size, and composition. Lithology may refer to either a detailed description of these characteristics, or a summary of the gross physical character of a rock. Lithology is the basis of subdividing rock sequences into individual lithostratigraphic units for the purposes of mapping and correlation between areas. In certain applications, such as site investigations, lithology is described using a standard terminology such as in the European geotechnical standard Eurocode 7.
Method for generating an estimate of lithological characteristics of a region of the earth's subsurface
InactiveUS6374185B1Electric/magnetic detection for well-loggingSeismic signal processingLithologyWellbore
The invention in a first embodiment comprises a system for generating an estimate of lithological characteristics of a region of the earth's subsurface. A correlation is generated between attributes of synthetic seismic data calculated from log data from at least one wellbore penetrating said region and lithological information from said at least one wellbore. The correlation is then applied to recorded seismic data from the region of the earth's subsurface to generate the estimate.
Owner:PGS GEOPHYSICAL AS
Methods and systems for improved drilling operations using real-time and historical drilling data
ActiveUS20140116776A1Maximized drilling rateLower Drilling CostsEarth drilling toolsMathematical modelsLithologyReal-time data
Methods and systems are described for improved drilling operations through the use of real-time drilling data to predict bit wear, lithology, pore pressure, a rotating friction coefficient, permeability, and cost in real-time and to adjust drilling parameters in real-time based on the predictions. The real-time lithology prediction is made by processing the real-time drilling data through a multilayer neural network. The real-time bit wear prediction is made by using the real-time drilling data to predict a bit efficiency factor and to detect changes in the bit efficiency factor over time. These predictions may be used to adjust drilling parameters in the drilling operation in real-time, subject to override by the operator. The methods and systems may also include determining various downhole hydraulics parameters and a rotary friction factor. Historical data may be used in combination with real-time data to provide expert system assistance and to identify safety concerns.
Owner:RESOURCE ENERGY SOLUTIONS
Petrophysical Method For Predicting Plastic Mechanical Properties In Rock Formations
InactiveUS20110015907A1Computation using non-denominational number representationGeological measurementsLithologyGeographic regions
Method for prediction of mechanical properties used in the description of large-strain plastic deformation for any subsurface rock strata of interest. The method is not specific to any geographic region, geological environment or subsurface depth interval, nor is it constrained to a specific lithology or plastic mechanical property. Predictive algorithms for triaxial compressive strength and rock compressibility are derived (23) from a mechanical properties database (21), and used to predict subsurface variation in mechanical properties such as rock strength or rock compressibility, with petrophysical properties generated from, for example, geophysical wireline logs as input to the algorithms (26).
Owner:EXXONMOBIL UPSTREAM RES CO
System and method for geologically-enhanced magnetic resonance imaging logs
InactiveUS6255819B1Electric/magnetic detection for well-loggingMeasurements using NMR spectroscopyMicro imagingLithology
An interpretation method and system for NMR echo-train data in thinly laminated sequences. The invention uses geological information obtained at higher vertical resolution, such as using Electric Micro Imaging, to enhance the vertical resolution of echo-train data, and thus avoids log interpretations in which the hydrocarbon potential of the formation can be misread because low resolution logs tend to provide an average description of the formation. Such averaging is especially problematic in thinly laminated sequences that consist of highly permeable and porous sand layers and less permeable silt or essentially impermeable shale layers. In a preferred embodiment, using the additional high-resolution formation information one can estimate the typical T2-spectra of lithological laminae, and significantly enhance the permeability estimate in the laminated sequences. The method and system are applicable to any temporal data from other logging tools, such as the thermal neutron decay log and others. The system and method enable proper evaluation of the high potential of thinly laminated formations, which may otherwise be overlooked as low permeable formations.
Owner:HALLIBURTON ENERGY SERVICES INC
System and method for enhanced vertical resolution magnetic resonance imaging logs
InactiveUS6337568B1Electric/magnetic detection for well-loggingMeasurements using NMR spectroscopyLithologyMicro imaging
An interpretation method and system for NMR echo-train data in thinly laminated sequences. The invention uses geological information obtained at higher vertical resolution, such as using Electric Micro Imaging, to enhance the vertical resolution of echo-train data, and thus avoids log interpretations in which the hydrocarbon potential of the formation can be misread because low resolution logs tend to provide an average description of the formation. Such averaging is especially problematic in thinly laminated sequences that consist of highly permeable and porous sand layers and less permeable silt or essentially impermeable shale layers. In a preferred embodiment, using the additional high-resolution formation information one can estimate the typical T2-spectra of lithological laminae, and significantly enhance the permeability estimate in the laminated sequences. In another aspect the system and method of the preferred embodiment use neural network(s) to further enhance the resolution of a particular log measurement. The method and system are applicable to any temporal data from other logging tools, such as the thermal neutron decay log and others. The system and method enable proper evaluation of the high potential of thinly laminated formations, which may otherwise be overlooked as low permeable formations.
Owner:HALLIBURTON ENERGY SERVICES INC
Well deflection and position gamma measuring nistrument during drilling
ActiveCN1676874AControl walkAchieve geosteeringSurveyNuclear radiation detectionLithologySignal processing circuits
The invention is direction and position drill-following survey apparatus comprising a drill collar, two V slots, metal shielding layer, tow gamma sensor, three-axis acceleration sensor, signal processing circuit module, high pressure sealing cover board, boring liquor conducting channel, upper slip ring connector, lower slip ring connector, wire hole. The invention integrated gamma survey and directional survey in just a short section which enables the drill not only survey the rock properties real-timely, but also tell the upper and lower rock characteristics when boring well., so to effectively find out the upper cover layer of the storage layer and seize the best timing entering the oil storage layer. Moreover, meanwhile assorting the upper and lower rock properties, the direction and drill status also can be obtained without any delay, which, facilitating adjusting the well boring track according to the geographic data and manage the drill travels a best track underground among the oil storage. The invention is suitable for geological guiding in fossil engineering.
Owner:中石化石油工程技术服务有限公司 +3
Method of simulating the sedimentary deposition in a basin respecting the thicknesses of the sedimentary sequences
ActiveUS7337069B2Seismic signal processingSpecial data processing applicationsLithologyFixed point algorithm
The method of the invention allows, by means of an iterative inversion algorithm, prediction of the spatial distribution of the lithologic composition of sediments deposited in a sedimentary basin during a geologic time interval, and the temporal evolution of the depositional profile throughout filling of the basin, while respecting exactly the thicknesses of the sedimentary sequences measured otherwise which is useful for locating hydrocarbon reservoirs. Input data of thickness maps of the sedimentary layer, location and composition of the sediment supply at the boundaries of the sedimentary basin, and physical parameters characterizing transport of the sediments during the period of consideration are applied to an iterative inversion loop initialized by the accommodation provided by a stationary multilithologic diffusive model which works as a fixed-point algorithm correcting the accommodations by means of a preconditioning of the residue on the sequence thicknesses obtained by an instationary model.
Owner:INST FR DU PETROLE
Radial core flooding apparatus and method for analysis of static and/or dynamic properties of reservoir rock
Apparatuses and methods suitable for (i) measuring lithological or petro-physical properties of reservoir core sample including shale rock; (ii) evaluating the degree of formation damage caused by foreign fluid into formation; (iii) conducting dynamic experiments, such as water flooding, chemical solution flooding, and supercritical CO2 injection to displacing oil tests; (iv) simulating physical radial flow experiments using reservoir core sample(s) at conditions of temperature up to 150° C. and pressure up to 6000 psi, are provided involving radial flow through the core sample(s) having at least partially hollow centers in an axial direction, up to annular axial cross-sections.
Owner:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
Bypass diverter box for drilling mud separation unit
A bypass diverter box disposed upstream from conventional solids control equipment of a mud system of a drilling rig contains a drilling mud separation unit having a continuous-loop scalper screen that is driven in a continuous loop to separate, convey and discharge large amounts of gumbo, heavy clays and drill solids at the end of the separation unit. The flow divider box is a box-like housing with a verter plate, upper and lower baffle plates and a grate that allows drilling fluid or drilling mud to be selectively directed to the mud separation unit to be separated prior to passing to the conventional downstream solids control equipment or allows the fluid to bypass the separation unit and flow directly to the conventional solids control equipment. The bypass diverter box baffle plates, diverter plate and grate, and selective utilization of the mud separation unit removes large amounts of gumbo, heavy clays and drill solids from the drilling mud and allows high flow rates to be easily processed by shale shakers and other conventional downstream solids control equipment of the mud system and compliments the drilling operations with respect to changes in the lithology, geological formations, or loss of returns in relation to the gallons pumped or folume of drilling fluid or drilling mud entering the bypass diverter box.
Owner:TUBOSCOPE NU TECGNT
Apparent dip angle calculation and image compression based on region of interest
ActiveUS20060015256A1Electric/magnetic detection for well-loggingSeismology for water-loggingComputational scienceLithology
The present invention provides a method and apparatus for logging an earth formation and acquiring subsurface information wherein a logging tool is conveyed in borehole to obtain parameters of interest. The parameters of interest obtained may be density, acoustic, magnetic or electrical values as known in the art. The parameters of interest may be transmitted to the surface at a plurality of resolutions using a multi-resolution image compression method. Parameters of interest are formed into a plurality of Cost Functions from which Regions of Interest are determined to resolve characteristics of the Features of interest within the Regions. Feature characteristics may be determined to obtain time or depth positions of bed boundaries and borehole Dip Angle relative to subsurface structures, as well borehole and subsurface structure orientation. Characteristics of the Features include time, depth, and geometries of the subsurface such as structural dip, thickness, and lithologies.
Owner:BAKER HUGHES INC
Petrophysics-Guided Processing of LWD Acoustic Data
Formation evaluation measurements are used to estimate formation lithology. The estimated lithology is used to provide an estimate of acoustic wave slowness. The estimated acoustic wave slowness is used to provide processing parameters for acoustic data that are less sensitive to noise.
Owner:BAKER HUGHES INC
Method for distinguishing reservoir fluid type by adopting resistivity data
ActiveCN101930082AMastering Real Response PropertiesImprove the identification rateElectric/magnetic detection for well-loggingMaterial resistancePorosityLower limit
The invention discloses a method for distinguishing a reservoir fluid type by adopting resistivity data, relating to the technological field of petroleum and gas logging, geology and core test analysis. The method comprises the following steps of: a. logging by utilizing core data scales and accurately calculating reservoir shale content, rock constituent and porosity; b. eliminating the influence of rock characters and the porosity on resistivity; c. utilizing a core test to obtain the parameters of m, a, n and b reflecting a pore structure, calculating the resistivity lower limit RR of an air layer and eliminating the influence of the pore structure on the resistivity; and d. distinguishing the reservoir fluid type by comparing a deep-induction and deep- lateral resistivity value RT andthe resistivity lower limit RR of the air layer obtained in the step c. The invention eliminates the influence of non-fluid factors of the rock characters, the porosity, the pore structure and the like on the resistivity, and maintains and utilizes the response characteristics of fluids with different resistivities so as to greatly enhance the coincidence rate for distinguishing the reservoir fluid type.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Lithology identification method
ActiveCN104989392ALithology Identification ContinuousMeet the evaluationBorehole/well accessoriesLithologyPorosity
The invention discloses a lithology identification method. The lithology identification method comprises the steps that firstly, conventional three-porosity (sound waves, density and neutrons) logging measured values of N rock core samples are obtained through the steps of thin section authentication, X-ray diffraction analysis, rock core true depth determination and the like; secondly, the relative distance between two parameters of conventional three-porosity logging is obtained, and the quantitative relation between the relative distance of the two parameters and primary mineral components obtained through X-ray diffraction total rock analysis is obtained according to the relative distance of the two parameters and the mineral components of the N rock core samples; thirdly, rock classification based on the relative distance of the two parameters is established and can be applied to lithology identification of fine grain sedimentary facies area logging, and continuous lithology identification can be carried out on well stratums without core sampled.
Owner:PETROCHINA CO LTD
Method For Predicting Lithology And Porosity From Seismic Reflection Data
ActiveUS20080015782A1Electric/magnetic detection for well-loggingAnalogue computers for heat flowLithologyPorosity
Method for predicting lithology and porosity of subsurface rocks from seismic reflection data. The seismic data is inverted to yield elastic properties of the rocks such as the compressional and shear impedances. A rock physics model is built to relate porosity, the shale volume fraction, the fluid content of the rock and the elastic properties of the rock. The model is run backward in a second inversion process to solve for porosity and lithologic properties such as the shale volume fraction.
Owner:EXXONMOBIL UPSTREAM RES CO
Method and system for predictive stratigraphy images
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.
Owner:BAKER HUGHES INC
Method for judging reservoir fluid type of difference between density porosity and neutron porosity
ActiveCN101832133AImprove the identification rateImprove guidanceBorehole/well accessoriesLithologyRock core
The invention discloses a method for judging the reservoir fluid type of a difference between density porosity and neutron porosity and relates to the technical fields of oil and gas logging and geology and core test analysis. The method comprises the following steps: 1) accurately calculating the shale content, the rock composition, the density porosity and the neutron porosity of a reservoir bycore data calibrating logging and logging data environmental correction; 2) removing the influence of factors of lithology, well diameter and mud invasion on density and neutron data; and 3) establishing standards for judging the reservoir fluid type by utilizing the response difference of the density and the neutron data to gas and formation water and by comparing the values of the density porosity and the neutron porosity. When the invention judges the reservoir fluid type by utilizing the density and the neutron data, non-fluid influencing factors, such as lithology, borehole conditions, mud invasion and the like are removed, therefore, influence features of different fluids to the density and the neutron data can be truly reflected, and the coincidence rate for judging the reservoir fluid type can be enhanced to above 90 percent from the existing 70 percent.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Sedimentary formation unit-based seismic facies analysis method
ActiveCN102053270AImprove analysis accuracyClear geological significanceSeismic signal processingLithologySeismic attribute
The invention belongs to the technical field of oil gas and coal-bed gas seismic exploration and development, and in particular relates to a reservoir sedimentary evolution analysis method in the exploration and development process. The method is used for providing reliable basic data for optimizing favorable target bed series and zone for oil gas and coal-bed gas exploration and development. In the method, sedimentary characteristics of reservoirs are analyzed by a three-dimensional seismic attribute data body, and high-resolution sequence stratigraphic principle and method, a seismic attribute analysis method and a pattern recognition method are applied; and a K-mean clustering algorithm is adopted, and the analysis process of sedimentary characteristics and sedimentary evolution of a sedimentary formation unit is performed under the control of a sedimentary isochronous interface. The method is used for assisting in reservoir sedimentary evolution research work in the exploration and development process of oil gas including unconventional oil gas, guiding the description of sedimentary characteristics of fine reservoirs of lithologic and stratigraphic trapped oil gas reservoirs, and providing the reliable basic data for optimizing the favorable target bed series and zone for the oil gas and coal-bed gas exploration and development.
Owner:CHINA PETROLEUM & CHEM CORP +1
Methods and systems for improved drilling operations using real-time and historical drilling data
ActiveUS9022140B2Easy to operateOptimized for speedEarth drilling toolsMathematical modelsLithologyReal-time data
Methods and systems are described for improved drilling operations through the use of real-time drilling data to predict bit wear, lithology, pore pressure, a rotating friction coefficient, permeability, and cost in real-time and to adjust drilling parameters in real-time based on the predictions. The real-time lithology prediction is made by processing the real-time drilling data through a multilayer neural network. The real-time bit wear prediction is made by using the real-time drilling data to predict a bit efficiency factor and to detect changes in the bit efficiency factor over time. These predictions may be used to adjust drilling parameters in the drilling operation in real-time, subject to override by the operator. The methods and systems may also include determining various downhole hydraulics parameters and a rotary friction factor. Historical data may be used in combination with real-time data to provide expert system assistance and to identify safety concerns.
Owner:RESOURCE ENERGY SOLUTIONS
Method for evaluating organic carbon content of shale
ActiveCN103670388AEliminate errorsEliminate calculation errorsBorehole/well accessoriesLithologyComputer science
The invention relates to a method for evaluating the organic carbon content of shale. The method comprises the steps that logging information is obtained and layer sections of the shale are obtained through division; lithology correction coefficients and radioactivity correction coefficients are obtained and corrected log response characteristic values are obtained; organic carbon content calculation functions of shale unit layer sections are established and the calculation function of the organic carbon content of each shale unit layer section is obtained; according to the determined organic carbon content calculation function, the organic carbon content of each shale unit layer section is calculated. According to the method for evaluating the organic carbon content of the shale, the defect that an organic carbon content result in the prior art is large in error is overcome, the organic carbon content in a stratum can be accurately and reliably evaluated, and therefore effective technical supports are provided for exploration and development of shale oil gas.
Owner:PETROCHINA CO LTD
Method for identifying lithology of three-dimensional volcanic rock
The invention relates to a method for identifying the lithology of volcanic rock. The method comprises the following steps of: determining the types of rock needing lithological identification; calculating the content of each element in stratigraphic rock in percentage by weight by using the theory of oxygen closed mold on the basis of elemental capture spectroscopy logging information; classifying the lithology of volcanic rock by using a silicon-alkali classification method; extracting the rock structure information of different classes of lithology of volcanic rock on the basis of imaging logging information in combination with oilfield on-site coring analysis and geologic description; combining the rock components calculated according to elemental capture spectroscopy logging with therock structure information determined according to the imaging logging information together and converting a TAS two-dimensional plane into a three-dimensional plane by using the rock structure information as a third dimension scale; and realizing three-dimensional volcanic rock lithological identification by using an SVM (Support Vector Machine) method. By adopting the method, the coincidence rate of lithological identification can be improved to reach more than 90%, which is 10 times that of the traditional method.
Owner:PETROCHINA CO LTD
Estimating formation stresses using radial profiles of three shear moduli
ActiveUS20100020642A1Seismic signal processingSeismology for water-loggingStress concentrationShear modulus
Maximum and minimum horizontal stresses, and horizontal to overburden stress ratio, are estimated using radial profiles of shear moduli. Inversion enables estimation of maximum and minimum horizontal stresses using radial profiles of three shear moduli associated with an orthogonal set of axes defined by the three principal stress directions. Differences in the far-field shear moduli are inverted together with two difference equations obtained from the radial profiles of the dipole shear moduli C44 and C55, and borehole stresses in the near-wellbore region. The horizontal to overburden stress ratio is estimated using differences in the compressional, dipole shear, and Stoneley shear slownesses at two depths in the same lithology interval where the formation exhibits azimuthal isotropy in cross-dipole dispersions, implying that horizontal stresses are nearly the same at all azimuths. The overburden to horizontal stress ratio in a formation with axial heterogeneity may also be estimated using the far-field Stoneley shear modulus C66 and dipole shear modulus C55 together with the radial variation of the dipole shear modulus C55 caused by near-wellbore stress concentrations.
Owner:SCHLUMBERGER TECH CORP
Method for improving drilling depth measurements
A method for selecting drilling operating parameters includes characterizing at least one drilling response parameter with respect to lithology. The characterization is performed when a parameter related to drill string dissipative motion parameter below a selected threshold. The at least one drilling response parameter is measured during drilling. Lithology is determined from the measured drilling response parameter. At least one drilling operating parameter is selected to optimize at least one drilling response parameter when a parameter related to drill string dissipative motion falls below a selected threshold for the determined lithology.
Owner:HUTCHINSON MARK W
A multi-well complex lithology intelligent identification method and system based on logging data
InactiveCN109919184AUniversally applicableSolve defects such as low accuracySurveyCharacter and pattern recognitionLithologyData file
The invention relates to a multi-well complex lithology intelligent identification method and system based on logging data. The method comprises the following steps: firstly, determining a target logging data file and carrying out format conversion and normalization preprocessing; performing feature screening and / or feature combination expansion on the logging curve data according to the known lithology of the key coring well in the whole region in the coring well section to obtain the logging curve data sensitive to the lithology; performing labeling calibration on the logging curve data sensitive to the lithology response to form a sample database, and forming a to-be-tested database by using the logging curve data which are not labeled in the whole region; utilizing data of the sample databaseto carry out machine learning training by combining a plurality of machine learning algorithms, and then automatically establishing a plurality of lithology recognition models. An optimal modelis selected through a classification performance evaluation rule, the optimal model is used for carrying out lithology prediction on the data in the database to be tested so as to realize intelligentidentification of multi-well complex lithology in the whole region, and the method is efficient, convenient, applicable in the whole region and very accurate in automatic intelligent prediction result.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Glutenite comprehensive geologic modeling method
The invention provides a glutenite comprehensive geologic modeling method. The method comprises step1, performing analysis and arrangement on drilling well, earthquake, logging and stratigraphic correlation information to screen geologic model basic data; step2, building a stratum and tectonic framework model through single-well fine stratigraphic correlation, fine earthquake explanation and fine inter-bed and fracture system description; step3, recognizing and determining lithologic characteristics; step4, building a sedimentary facies model; step5, building an attribute model through a pore penetration model. By the aid of the method, the lithology identification accuracy is improved, and rapid division of the sedimentary facies is achieved through man-machine interaction.
Owner:CHINA PETROLEUM & CHEM CORP +1
Multi-parameter logging method while drilling based on controllable neutron source
ActiveCN102518431AShorten the lengthSimple structureBorehole/well accessoriesNuclear radiation detectionSequence designLithology
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Method for prospect identification in asset evaluation
InactiveUS7113869B2Effective wayPowerful toolElectric/magnetic detection for well-loggingSeismic signal processingLithologyPore fluid
Owner:SCHLUMBERGER TECH CORP
Method for Gradually Modifying Lithologic Facies Proportions of a Geological Model
InactiveUS20080243447A1Electric/magnetic detection for well-loggingComputation using non-denominational number representationLithologyModel method
Method for gradually modifying a geological model representative of an underground reservoir so as to respect fixed average proportions of these lithologic facies.A group of facies referred to as selection and a subgroup of facies referred to as association are selected. A transformation parameter is defined by the ratio between the average proportions of the facies of the association and those of the selection. Within the context of history matching, a difference between measured dynamic data values and values calculated by means of a flow simulator from the geological model is measured. An optimization algorithm is used to deduce therefrom a new value for the transformation parameter that minimizes this difference and this transformation is applied to the lithologic facies of the selection. The modification can be applied to the entire model or to a given zone.
Owner:INST FR DU PETROLE
Method of constructing a geological model of a subsoil formation constrained by seismic data
InactiveUS20080162093A1Computation using non-denominational number representationSeismic signal processingLithologyGeomorphology
An method of constructing a geological model of a subsoil formation constrained by seismic data having application to petroleum reservoir development is disclosed. Logs relative to geological properties are acquired and a seismic facies cube is constructed. Logs relative to geological properties and logs relative to seismic facies are then simulated. Then distribution of proportions is estimated at any point on the subsoil by means of the acquired logs in the well and of the simulated logs. A seismic constraint is then defined by constructing a lithologic facies average proportion cube from these estimated proportion distributions. Finally, a geological model wherein the geological properties are constrained by this lithologic facies average proportion cube is constructed.
Owner:INST FR DU PETROLE
Method for judging fluid type of reservoir through acoustic porosity-neutron porosity differential
ActiveCN101787884AHigh compliance rateMastering the Influence CharacteristicsPermeability/surface area analysisBorehole/well accessoriesLithologyNeutron porosity
The invention discloses a method for judging the fluid type of a reservoir through an acoustic porosity-neutron porosity differential, which relates to the technical field of oil and gas logging, geology and core test analysis. The method comprises the following steps: 1) accurately calculating shale content, rock compositions, acoustic porosity and neutron porosity of the reservoir through core data calibration logging and logging data environment correction; 2) excluding the influence of factors such as lithology, borehole diameter and mud invasion on an acoustic transit time and neutron data; and 3) establishing a standard for judging the fluid type of the reservoir by comparing the magnitude of the acoustic porosity and the neutron porosity and using the response difference of the acoustic transit time and the neutron data to the gas and formation water. In the method, non-fluid influence factors such as the lithology, borehole conditions, mud invasion and the like are excluded when the fluid type of the reservoir is judged, so the characteristics of the influence of different fluids on the acoustic transit time and the neutron data can be grasped truly, and the coincidence rate of judging the fluid type of the reservoir is improved from 70 percent currently to over 90 percent.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method of drilling and producing hydrocarbons from subsurface formations
Owner:EXXONMOBIL UPSTREAM RES CO
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