27 results about "Fault block" patented technology

The invention provides a time-depth conversion method and device for a hidden structure of a low-exploration-degree foreland thrust zone, and belongs to the technical field of geological exploration. The method comprises the steps of obtaining speed change characteristics of a research area; establishing a geologic structure model by using the seismic interpretation horizon and fault data of the time domain; converting the geologic structure model into an interval velocity model through an interval control breaking block velocity assignment method; establishing virtual well control points in the research area, and extracting an interval velocity curve at each virtual well control point from the interval velocity model; converting the interval velocity curve at the virtual well control point into an average velocity curve; constructing a three-dimensional average velocity body by using a layer control breaking block virtual well control point spatial interpolation method; and performing time-depth conversion on the target layer. The variable-speed mapping is performed based on the time-depth conversion method realized by the invention, and through the obtained depth domain structure map, the identification of the hidden structure of the low-exploration-degree foreland thrust zone can be realized, and reliable depth data is provided for fine description of entrapment.

The application provides a method for improving oil recovery by CO2 huff and puff after fracturing, which comprises the following steps: step 1, establishing a CO2 huff and puff model; step 2, determining a reasonable fracture length according to a geological condition; step 3, simulating a fracturing fracture parameter under the reasonable fracture length according to the geological condition and a construction condition; step 4, optimizing a CO2 huff and puff round and a CO2 huff and puff amount; and step 5, carrying out a field block application and implementing the CO2 huff and puff. The method for improving oil recovery by CO2 huff and puff after fracturing adopts a numerical simulation means to determine construction information such as a reasonable fracture length and a CO2 huff and puff amount, provides support for improving oil production of small fault blocks and small sand bodies, and improves the oil recovery effect of the small fault blocks and the small sand bodies by means of the combination of artificial fracturing and CO2 huff and puff.

The present invention relates to a method, device, medium and equipment for predicting the recovery rate of an offshore thin interbedded sandstone reservoir. The method comprises the following steps: determining whether the offshore sandstone reservoir is a thin interbedded sandstone reservoir; determining an interlayer interference correction coefficient E of the offshore sandstone reservoir based on the Lorentz coefficient; i ; Based on the density of small fault blocks and well pattern density, determine the fault block influence coefficient E f ; Determine the sand body correction coefficient E based on the well spacing and the median sand body size s ; Based on the interlayer interference correction coefficient E of offshore sandstone reservoirs i , block influence coefficient E f , sand body correction coefficient E s , determine the comprehensive calculation formula of recovery factor E R The prediction method of the present invention avoids the uncertainty of reservoir numerical simulation prediction caused by unclear reservoir knowledge, as well as the problems of complex numerical simulation process, high cost, long cycle, etc.

The invention discloses a complex fault block geothermal field earth heat flow analysis method and related equipment, relates to the field of geothermal development, and mainly aims to solve the problem that a more accurate earth heat flow calculation method is lacked at present. The method comprises the steps that a radioactive heat generation rate formula is constructed based on radioactive elements of a target area, and the radioactive heat generation rate formula is used for determining radioactive heat generation data; based on the bed rock burial depth form of the target area, a thermal conductivity and burial depth relation graph is constructed, and the thermal conductivity and burial depth relation graph is used for determining deep conduction heat; and determining an earth heat flow value of the target area based on the radioactive heat generation data and the deep conduction heat. The method is used for the complex fault block geothermal field earth heat flow analysis process.

The application provides a method for determining the oil-water interface of a fault block reservoir based on the water breakthrough time of an oil well, which comprises the following steps: step 1, obtaining reservoir basic parameters; step 2, obtaining the properties of crude oil in the reservoir; step 3, obtaining oil well data; step 4, calculating the depth of the oil-water interface and determining the oil-water interface of the fault block reservoir. The method for determining the oil-water interface of a fault block reservoir based on the water breakthrough time of an oil well has the advantages that the oil-water interface is determined based on the water breakthrough time of the oil well, the required parameters are easy to obtain, the calculation is simple, fast and convenient, and the method has good guiding significance for the development scheme compilation, especially for a newly discovered reservoir, and has a wide application prospect.

The invention belongs to the technical field of oil and gas exploration and development, and relates to a complex fault block area ancient landform recovery method and system based on structural back-stripping, and the method comprises the steps: obtaining a structural map of a to-be-recovered target layer, recognizing faults in the structural map, and carrying out the sequential numbering of the faults according to a set direction, and obtaining a numbered structural map; recovering the vertical fault displacement of each fault according to the calculated vertical fault displacement breaking block of each fault in the numbering structure diagram, and recovering the horizontal fault displacement of each fault according to the measured horizontal fault displacement segmentation block of each fault in the numbering structure diagram; and setting a reference surface, respectively calculating a distance TR from the top surface structure map after fault displacement recovery to the reference surface and a distance BR from the bottom surface structure map after fault displacement recovery to the reference surface, and subtracting the distance TR from the distance BR to obtain a compacted ancient landform curved surface. The method quantitatively recovers the ancient landform of the target stratum in the deposition period, and can effectively know the prediction of the deposition system and the prediction of the hydrocarbon generation center.

The present invention provides a method for comprehensively determining the causes of fault seismic reflection blank zones using a geological-seismic approach, comprising: step 1, comparative analysis of seismic data collected from different periods and using different acquisition methods within a study area; step 2, theoretical analysis of the causes of fault seismic reflection blank zones; step 3, analysis of the fault structure and geological characteristics of the fault cementation-filled zone; step 4, forward modeling to demonstrate the influence of the fault cementation-filled zone on fault reflection characteristics; step 5, dialectical analysis of the relationship between geological phenomena and fault seismic reflection characteristics; and step 6, based on the above analysis, establishing a geological-seismic model to determine the causes of fault seismic reflection blank zones, determine interpretation schemes for such faults, and guide well placement. This method for comprehensively determining the causes of fault seismic reflection blank zones provides valuable support for the detailed characterization of narrow reservoir traps in complex fault blocks, facilitating further exploration of oil and gas potential.

The invention discloses a method and device for quantitatively determining the damage effect of fracture on closure of a cover layer, and relates to the field of oil and gas field exploration, and the method comprises the steps: obtaining petroleum seismic exploration data of a to-be-predicted region; according to the petroleum seismic exploration data of the to-be-predicted area, determining a fault position information set which has a destructive effect on the cover layer after reservoir formation; constructing a three-dimensional fault and cover layer model, and coupling the three-dimensional fault and the cover layer model according to the position information of the damaged fault to obtain a cover layer and fault coupling structure model; based on the cover layer and fault coupling structure model, obtaining a cover layer damage index of the to-be-predicted region; and according to the cap layer damage index of the to-be-predicted area, determining the damage degree of the fracture in the to-be-predicted area on the cap layer sealing performance. According to the method, high-precision quantitative evaluation of the destructive effect of fracture on the closure of the cover layer is realized, the risk of cover layer evaluation in oil and gas exploration and development is effectively reduced, the accuracy of fault block oil and gas reservoir evaluation is improved, and powerful support is provided for formulation of a subsequent development strategy of an oil and gas field.

This invention discloses a method, system, electronic device, and computer-readable storage medium for evaluating the sidetracking potential of different types of reservoirs in complex fault blocks. The method includes: determining the reservoir type; selecting evaluation indicators affecting the sidetracking potential of different reservoir types; establishing the weights of each evaluation indicator; determining the distribution of evaluation levels and the corresponding evaluation classification standards for each evaluation indicator in each evaluation level; establishing an unknown single-indicator measurement function; statistically analyzing the actual values ​​of each evaluation indicator for the target reservoir; determining the quantitative value of a single indicator; classifying the sidetracking potential levels based on the comprehensive evaluation of multiple indicators; and calculating the comprehensive score based on the comprehensive evaluation vector of multiple indicators and the assignment of evaluation space. This invention proposes the concept of evaluating sidetracking potential by reservoir type, accurately characterizing the size of the sidetracking potential of the target area, and compensating for the inaccurate potential evaluation when using the same parameters for reservoirs with different conditions; it also establishes an unknown single-indicator measurement function, realizing the hierarchical and quantitative analysis of geological parameters in the target area.

The invention discloses a method and device for predicting natural energy of an undeveloped fault block oil reservoir. The method comprises the steps that fault development characteristics, natural water body multiples, reservoir connectivity physical properties and scores of differences between original pressure and saturation pressure of the undeveloped fault block oil reservoir are determined according to related geological information of the undeveloped fault block oil reservoir; determining a natural energy comprehensive factor value of the undeveloped fault block oil reservoir by utilizing a weighting method; and determining the natural energy of the undeveloped fault block oil reservoir according to the natural energy comprehensive factor value.

The application provides a fault two-plate sand body connectivity evaluation method based on seismic data, comprising the following steps: step 1, carrying out structural interpretation of a fault plane based on three-dimensional seismic data to form a fault plane planar structure map; step 2, using three-dimensional seismic data to perform layer flattening with the fault plane as a target layer, and establishing a layer flattening seismic data body; step 3, using the layer flattening seismic data body to extract attributes of the upper and lower plates of the fault respectively, and calculating a difference ratio A of the attributes on both sides of the fault; step 4, using the A value of a known open fault to determine the A value range of the sand body connectivity of the two plates of the fault, and defining the A value range as a threshold B, and determining the sand body connectivity of the two plates of the whole fault according to the B and the attribute graph A. The method is based on three-dimensional seismic data, fully utilizes logging data and is relatively simple to apply. The fault two-plate sand body layering connectivity can be effectively carried out in a three-dimensional seismic data coverage area, and a new method is provided for evaluating the feasibility of layering water injection between fault block reservoirs.

The embodiment of the invention provides a fault block trap reservoir-forming potential evaluation method, a medium and equipment. The method comprises the following steps: acquiring geological parameters of a target layer of a fault block trap; classifying each fault corresponding to the target layer; based on the classification result of each fault in the corresponding fault block trap, standardizing the geological parameters to obtain standard geological parameters; calculating a standard fault parameter of a transport fault, and determining a transport capability index; calculating a standard fault parameter of the shielded fault, and determining a shielding capability index; calculating a standard trap parameter of the fault block trap, and determining a trap aggregation index; determining a reservoir forming potential index of the target layer according to the transport capability index, the shielding capability index and the trap aggregation index; and sorting the fault block traps according to the reservoir forming potential indexes of all the target layers of each fault block trap to obtain a reservoir forming potential sorting result of the fault block traps. Through a quantitative evaluation mode in the method, accurate evaluation of the reservoir forming potential of the fault block trap is realized.

This invention relates to the field of geological exploration and 3D geological modeling technology, specifically a method and system for 3D modeling of ore bodies based on multi-source exploration geological data. The method includes: acquiring multi-source spatial discrete data and spatial continuous gradient data within a preset 3D spatial range, and constructing a spatial voxel mesh based on the multi-source spatial discrete data and spatial continuous gradient data; calculating the spatial metric tensor matrix of each voxel node in the spatial voxel mesh to generate a spatial topological barrier field; using the source point of the target object as the initial zero-order jump set to generate an initial symbolic distance field; extracting the zero isosurface of the initial symbolic distance field to obtain the Euclidean deviation residual; if the Euclidean deviation residual exceeds a preset residual threshold, continuing until the Euclidean deviation residual does not exceed the residual threshold; when the Euclidean deviation residual does not exceed the residual threshold, generating a 3D triangular mesh of the target object. This invention achieves simultaneous continuous generation of the ore body surface and fault blocking.

The present application relates to the technical field of seismic data processing, and discloses a method for recovering global paleo-structural configuration by moving fault block data bodies, comprising: dividing the hanging wall fault block data body into a plurality of unit bodies along the direction perpendicular to the section; moving any unit body of the hanging wall fault block data body to the boundary of the section along the reverse direction of the sliding direction according to a step size; calculating the seismic feature similarity of the adjacent unit bodies on both sides of the section each time the unit body is moved, and selecting the position with the highest seismic feature similarity as the optimal position for moving the unit body; repeating the moving of the unit body until all the unit bodies of the hanging wall fault block data body are moved; and repeating the above steps until the fault block data body group in the multi-fault activity period is moved, so that the global paleo-structural configuration is obtained. The method can offset the changes caused by the rotational movement of the fault, and improve the accuracy and precision of the recovered paleo-structural configuration.

The present invention provides a method and device for estimating the remaining oil distribution area near the fault of an oil well, comprising: S1, carrying out detailed reservoir description for multiple fault blocks covered by a target zone, and establishing multiple typical geological models representing the characteristics of the fault block reservoir in the target zone; S2, based on the geological model, using the reservoir numerical simulation method, performing reservoir numerical simulation calculation; S3, based on the reservoir numerical simulation calculation result, statistically analyzing the size of the remaining oil distribution area near the fault of the oil well when the water content of the oil well reaches a threshold value, and the oil well is an oil well in the extremely high water content period of the fault block reservoir; S4, establishing a remaining oil distribution area estimation model based on the geological model established in step S1 and the remaining oil distribution area obtained in step S3. The present application solves the problem of quantitatively estimating the remaining oil distribution area near the fault of an oil well in the extremely high water content period of a fault block reservoir; and achieves the purpose of rapid quantitative estimation of the remaining oil distribution area near the fault of an oil well in the extremely high water content period of a fault block reservoir.

The invention provides a numerical simulation method for a low-permeability fault block oil reservoir based on embedded discrete fractures, which comprises the following steps of: S1, constructing basic units of an angular point grid: establishing a three-dimensional rectangular coordinate system by taking a central point of a matrix grid as a circle center, and dividing each vertex of the matrix grid into eight different quadrants according to coordinate values of each vertex, determining the position of each grid block through the eight angular points; s2, crack definition and intersection point calculation: defining crack positions and shapes through coordinate points, and performing grid conductivity calculation; and S3, constructing a low-speed nonlinear seepage mathematical model of the low-permeability fault block oil reservoir, and solving the model to obtain simulation parameters. According to the method, the complex geological structure of the fault block oil reservoir can be accurately described, in addition, the nonlinear seepage characteristics of a low-permeability reservoir matrix and various complex mechanisms of oil reservoir dynamic development are considered, and dynamic development of the low-permeability fault block oil reservoir can be accurately and efficiently simulated.

The present invention discloses a method for optimizing the design of well expansion in complex fault blocks with multiple layers and multiple faults. The method includes: conducting a regional stratum comparative analysis based on the regional stratigraphic stratification model to obtain the target stratum for well location deployment; obtaining the stratum for oil layer groups, sandstone groups, and single sand bodies based on the sedimentary cycles of the target stratum in combination with the "214" comparison method; finely calibrating seismic and geological horizons; establishing an isochronous stratigraphic framework; finely identifying the boundary faults and internal inter-well small faults of the complex fault block; and simultaneously obtaining the structural ups and downs of the target reservoir; obtaining the development of target sand bodies in unknown areas, and then obtaining the distribution characteristics of the sand bodies in the target reservoir of the complex fault block; optimizing the design of well locations in the reservoir based on the obtained complex fault block reservoir data; and ground planning of slave well platforms, i.e., drilling three to five wells on one platform. This method can determine the most effective well location, ensure the efficient development of complex fault blocks, and improve the success rate of reservoir drilling and the utilization rate of new wells.

The invention discloses a fault block oil reservoir large fault footwall seismic time section structure illusion identification method. The method comprises the following steps that (1) a fault distribution rule is clarified by a coherent slice; (2) carrying out horizon calibration and low-speed layer bottom surface whole-area tracking interpretation; (3) large fault section interpretation; (4) forward modeling of large fault models in different forms and identification of illustrations in different types; the method is suitable for the technical field of seismic data structure artifact recognition, more actual geological conditions are considered, different types of false structures are simulated, the forming conditions and characteristics of different structure artifacts are clarified, judgment of true and false structures in structure interpretation is effectively guided, and the method has the advantages of being high in practicability and easy to popularize. And the method for recovering the false structure by utilizing low-speed zone bottom surface seismic interpretation horizon trend control is simple and efficient, and finally, real structural morphological characteristics can be displayed.

The invention discloses a fault block sand shale thin interbed type oil and gas reservoir potential layer determination method and device. The method comprises the steps that a first target potential layer list is determined; determining sensitive parameters by combining geological knowledge of the fault block sand shale thin interbed type oil and gas reservoir and sensitivity analysis on the reservoir in numerical simulation, and determining a first potential layer analysis parameter from the sensitive parameters; calculating a comprehensive screening value of each target potential layer according to the analysis parameter value of the first potential layer, the remaining reserves of the well layer and the current pressure maintaining level; adding the target potential layers of which the comprehensive screening values are greater than a preset threshold value into a second target potential layer list; analyzing a second potential analysis parameter for a target potential layer in the second target potential layer list, and performing potential comprehensive calculation in combination with the comprehensive screening value to obtain a comprehensive potential value; and querying a potential layer level corresponding to the comprehensive potential value from a preset potential layer division table. The productivity of the target oil and gas field can be quantitatively analyzed and estimated, and the target potential layer is optimized.

The present application belongs to the technical field of oil and gas exploration and development, and relates to a complex fault block area paleogeomorphology recovery method and system based on structure backstripping, the method steps being: obtaining a structure map of a target layer to be recovered, identifying faults in the structure map, and sequentially numbering the faults according to a set direction to obtain a numbered structure map; dividing the vertical fault throw of each fault according to the calculated vertical fault throw of each fault in the numbered structure map, and dividing the horizontal fault throw of each fault according to the measured horizontal fault throw of each fault in the numbered structure map; setting a reference surface, respectively calculating the distance TR from the top surface structure map after fault throw recovery to the reference surface and the distance BR from the bottom surface structure map after fault throw recovery to the reference surface, and obtaining the compacted paleogeomorphology surface by subtracting the distance TR from the distance BR. The present application quantitatively recovers the paleogeomorphology of the target layer during the sedimentary period, and can effectively predict the sedimentary system and the hydrocarbon generation center.

The invention discloses a complex fault block thin oil reservoir drilling trajectory optimization method and device. The method comprises the steps that geological data and a three-dimensional geological model of a complex fault block reservoir are obtained; inputting the geological data into a pre-trained recognition model, and outputting a recognition result; determining a well position optimization target position; evaluating the well wall stability, high pressure and leakage risk of each position in the three-dimensional geologic model to generate an evaluation result; according to the well position optimization target position, the evaluation result and the preset trajectory parameters, the optimal drilling trajectory is generated, complex distribution characteristics and variable reservoir conditions of the underground thin oil layer can be fully considered, the well position and drilling trajectory determination efficiency is effectively improved, the determined well position and drilling trajectory can improve the drilling success rate, and the drilling efficiency is improved. The exploitation efficiency and yield of an oil field are obviously improved.

The embodiment of the application provides an evaluation method, device and equipment for complex fault block developed dynamic loss geological reserves, and belongs to the technical field of reservoir development. The evaluation method comprises the following steps: obtaining the injection-production relationship of oil-water wells of each layer in an oil-bearing area region, and performing single-well grid division on the oil-bearing area region according to the injection-production relationship of the oil-water wells, to obtain a plurality of single-well grids; determining the loss reserve type of each single-well grid based on the dynamic loss reserve causes of the oil-bearing area region; determining the loss reserve of each single-well grid according to the loss reserve type of each single-well grid; and determining the total loss reserve of each type of loss reserve type based on the loss reserve of each single-well grid. The application aims to more accurately obtain the loss reserve of a complex fault block reservoir.

The invention provides a complex fault block deep tight reservoir description method based on fracture description and reservoir dessert representation. The method comprises the following steps: carrying out three-dimensional representation on multi-scale fractures of a complex fault block deep tight reservoir; performing post-stack-pre-stack inversion collaboration, and analyzing desserts in the reservoir; and predicting the fracture development zone, the stress direction and the stress intensity according to the multi-scale fracture three-dimensional representation and the reservoir internal sweet spot analysis result. The method is a comprehensive technology capable of realizing complex fault block deep tight reservoir multi-scale fracture three-dimensional characterization, sweet spot reservoir accurate prediction and crustal stress field effective analysis, and the reservoir description precision and development efficiency are improved. And the post-stack three-dimensional seismic attributes realize crack and fracture identification by analyzing the discontinuity of seismic reflection waveforms. Existing data are fully utilized, reservoir prediction research is respectively carried out before stacking and after stacking, and sweet spots in the reservoir are analyzed. The fracture development zone, the stress direction and the stress intensity are predicted, and a basis is provided for follow-up fracturing production.

The invention relates to the technical field of general image data processing, in particular to a three-dimensional geologic body model-based structural trap automatic identification method, which comprises the following steps of: converting three-dimensional geologic body model data into a txt format, extracting effective data and converting the effective data into an excel format; generating a terrain DEM based on the vector point set by using a triangulation grid algorithm and a DEM interpolation algorithm; based on the fault point data, using a trajectory generation algorithm and a surface domain identification algorithm to construct a fault surface, and extracting an effective fault intersection line; carrying out boundary cutting on the land parcel DEM by adopting a cutting algorithm; extracting potential overflow points; rejecting false overflow points; extracting construction contour lines passing through the effective overflow points; extracting an anticlinal trap surface; extracting a fault block trap surface; and extracting a broken back trap surface. The method achieves the automatic recognition of the structural trap through an algorithm, remarkably reduces the data dependence and operation cost, improves the recognition efficiency, and is suitable for the fields of oil and gas exploration and development, carbon dioxide capture, utilization and storage, geothermal storage and the like.

The embodiment of the present invention discloses a method, device, storage medium and electronic device for evaluating fault-controlled oil and gas enrichment, the method comprising: obtaining geological information of the fault corresponding to the exploration target; determining the oil supply capacity, conductivity and filling capacity of the fault according to the geological information; determining the reservoir control capability coupling coefficient of the fault according to the oil supply capacity, conductivity and filling capacity; and evaluating the fault-controlled oil and gas enrichment of the exploration target according to the reservoir control capability coupling coefficient. The technical solution provided by the embodiment of the present invention takes into account the oil supply capacity, conductivity and filling capacity of the exploration target fault, improves the accuracy of quantitative evaluation of fault-controlled oil and gas enrichment, and at the same time, can efficiently find oil and gas enriched fault blocks in many complex fault block closures, thereby effectively guiding oil and gas exploration.

The present application discloses a method and device for quantitatively determining the destructive effect of a fault on the sealing property of a cap rock, and relates to the field of oil and gas field exploration. The method includes obtaining petroleum seismic exploration data of the area to be predicted; determining a set of fault position information that will have a destructive effect on the cap rock after reservoir formation based on the petroleum seismic exploration data of the area to be predicted; constructing a three-dimensional fault and cap rock model, and coupling the two based on the destructive fault position information to obtain a cap rock and fault coupling structural model; obtaining a cap rock damage index of the area to be predicted based on the cap rock and fault coupling structural model; determining the degree of destructive effect of a fault on the sealing property of the cap rock in the area to be predicted based on the cap rock damage index of the area to be predicted. The present application realizes a high-precision quantitative evaluation of the destructive effect of a fault on the sealing property of a cap rock, effectively reducing the risk of cap rock evaluation in oil and gas exploration and development, not only improving the accuracy of fault block oil and gas reservoir evaluation, but also providing strong support for the formulation of subsequent development strategies for oil and gas fields.

The invention relates to the field of oil exploitation, and particularly discloses a recovery efficiency stability analysis method for a fault block oil reservoir and application of the recovery efficiency stability analysis method. Comprising the following steps that S1, a well area adopting injection-production coupling mining in an oil field is selected for data collection; s2, selecting influence factors of the current injection-production contradiction, and carrying out a flat plate sand filling experiment and numerical simulation; s3, proposing an improved scheme according to an experimental result, and comparing the change conditions of the recovery ratio before and after the improved scheme is executed by means of the reliability analysis model; according to the method, the defects in the aspect of engineering verification are overcome on the basis of traditional flat plate sand filling experiments and numerical simulation research results. The invention provides a scheme analogy mathematical analysis method which is high in matching performance and high in responsivity. The problems of long development scheme verification period, weak parameter contrast and the like are solved, and the systematic working steps of experiment, data simulation, scheme proposing and mathematical demonstration of oil reservoir development are perfected.