26 results about "Fault plane" patented technology

The invention provides a shale reservoir hydraulic fracturing wellbore casing deformation risk judgment method which comprises the steps that geological parameters and principal stress of a target area are obtained, and the principal stress comprises horizontal principal stress, maximum principal stress and vertical principal stress. And determining an included angle between the fault plane and the hydraulic fracture plane according to the normal vector of the fault plane and the normal vector of the hydraulic fracture plane. And calculating by substituting the geological parameters, the principal stress and the included angle into an established stress calculation model of the fault plane to obtain shear stress and normal stress of the fault plane in the target area. And calculating by substituting the shear stress and the normal stress into the established displacement component calculation model to obtain the slip component of the fault plane in the target area. And performing safety early warning based on the risk level. The fault slip amount is calculated by accurately identifying the stratum physical property parameters and the fault structure, so that the casing deformation risk is judged.

The application provides a seismic motion simulation method based on a stochastic finite fault model. The method comprises the following steps: determining an equivalent magnitude and an equivalent epicentral distance from different exceedance probability levels of a target area, determining geometric parameters of a fault model according to the equivalent magnitude, wherein the geometric parameters comprise a fault burial depth, a fault plane size and a number of sub-faults; dividing the fault plane into a plurality of sub-faults according to the number of sub-faults; calculating rupture propagation time and seismic wave propagation time of each sub-fault to an observation point by using a bilateral rupture mode; generating a seismic motion time history of each sub-fault by using the stochastic finite fault model; introducing a frequency attenuation factor and a path attenuation factor to correct the seismic motion time history; and superimposing corrected seismic motion time histories corresponding to all sub-faults to generate a seismic motion field of the target area. The technical scheme provided by the application realizes fine simulation of a fault rupture process based on a multi-probability scenario, and improves the physical rationality and spatial resolution of target area seismic motion field prediction.

The invention provides a method and system for automatically extracting and identifying related tectonic earthquakes under the constraint of a three-dimensional geometric structure of a fault, and relates to the technical field of earthquake activity analysis. According to the method, fault surface trace data, geological occurrence parameters and three-dimensional geometric parameters are obtained, the fault strike angle is determined through principal component analysis, the inclination angle is determined based on orthogonal vector decomposition, and then a three-dimensional fault plane and fault body geometric model is constructed through curved surface modeling; and under the constraint of the three-dimensional geometric structure, judging the spatial relationship between the seismic points in the seismic directory data and the fault, realizing the classification and identification of the fault-related tectonic earthquake, and outputting an analysis result. According to the invention, the spatial integrity of fault geometric expression and the tectonic earthquake identification precision are improved.

The present application relates to a geological modeling method for a geological feature uncertain reservoir. The method comprises the following steps: identifying uncertainty factors of the geological feature uncertain reservoir; parameterizing the uncertainty factors; determining possible distribution modes of the uncertainty parameters; respectively performing random sampling on each uncertainty parameter under each distribution mode to obtain a plurality of certain parameter combinations; each certain parameter combination corresponds to a certain geological model; predicting the geological feature uncertain reservoir through the certain geological model to obtain a plurality of prediction results; and statistically analyzing the prediction results to evaluate the prediction probability and prediction risk of each certain geological model. The present application provides a plurality of certain reservoir geological models varying with key geological features such as stratigraphic plane, fault plane and fracture plane, can be fitted through production history, can invert all the modeled uncertainty parameters, can reduce model uncertainty, and is more suitable for practical use.

According to the method for calculating the fortified length of the cross section expanded section of the strike-slip fault tunnel and the related equipment provided by the invention, through fitting processing of the axes of the tunnels on the two sides after fault dislocation, accurate quantitative characterization of the axis form after dislocation is realized, and basic data support fitting an actual engineering scene is provided for fortified length calculation. The section expanding sections are symmetrically arranged in an extending mode with the section face as the center, full-coverage protection of a fault dislocation influence area is guaranteed, and the problem that local protection is lost possibly due to single-side fortification is avoided. The calculation logic combining the axis fitting and the clearance requirement breaks through the limitation that an existing engineering category method depends on experience judgment, quantitative calculation of the fortification length is achieved, it is guaranteed that the anti-dislocation performance of the tunnel meets the clearance requirement, construction cost waste caused by the too large fortification length can be avoided, and the method is suitable for popularization and application. And a foundation is laid for smooth fitting of a post-earthquake tunnel axis and rapid recovery of functions.

The invention discloses a fault element constraint-based fault automatic interpretation method. The method comprises the following steps of S1, selecting fault plane sensitive attributes; s2, performing fault plane interpretation on more than two horizon positions according to fault plane sensitive attributes; and S3, projecting a fault plane interpretation result to a seismic section, and performing automatic interpretation in combination with fault elements and fault sensitive attributes. According to the automatic fault interpretation method based on the fault element constraint, the problem of rapid, accurate and automatic interpretation of the fault with the fault displacement smaller than 20 m is solved.

This invention provides a method and system for determining fault planes using stratigraphic gradients and dip curvature, belonging to the field of petroleum exploration. The method includes: determining multiple stratigraphic gradients corresponding to multiple local surface models based on seismic data of a target layer, wherein the target layer includes a fault plane; obtaining cross sections of multiple local surface models based on the multiple stratigraphic gradients corresponding to the multiple local surface models and the dip and strike of each local surface model to determine the true curvature of the multiple cross sections; and determining the fault plane in the target layer based on the multiple stratigraphic gradients corresponding to the multiple local surface models and the true curvature of the multiple cross sections. This invention solves the technical problem of existing technologies being unable to accurately determine the curvature of fault planes, thus failing to accurately determine fault planes, and improves the accuracy of fault plane determination.

This invention provides a method for predicting fault connectivity based on PCA-CRITIC weights, relating to the field of oil and gas exploration technology. It includes determining the influencing factors of fault vertical connectivity, including the thickness of the displaced caprock, clay content, fault plane normal stress, formation fluid pressure, caprock brittleness index, and fault displacement. A comprehensive mathematical formula for the fault vertical connectivity coefficient is established. Based on the oil, gas, and water data from drilled wells and paleoreservoir tracing data near the displaced strata, the vertical connectivity coefficient is calculated using the comprehensive mathematical formula and by well and well depth segment. The vertical connectivity is analyzed based on the fault vertical connectivity coefficient and the oil and gas content of the near displaced strata, predicting the fault vertical connectivity in oil and gas basins. This invention accurately characterizes the oil and gas migration paths within faults, significantly improving prediction accuracy and exploration efficiency.

The invention relates to the technical field of three-dimensional modeling, and discloses a system and method for exporting a stratum section line file adaptive to MapGIS modeling based on Petrel software, and the method comprises the steps: preparing three-dimensional structure planar graph data of a stratum to be modeled; establishing a vertical fault plane in Petrel software along the trend of a target section, and converting the vertical fault plane into a Surface file; utilizing a Surface operation function to generate a space intersection line between the upright fault plane and each structural plane graph; and exporting the intersecting line data as an SHP format file, and converting the intersecting line data into a line file which can be identified by a MapGIS platform. The system comprises a corresponding data preparation module, an upright fault plane construction module, an intersection line generation module and a data export conversion module. According to the method, efficient and accurate conversion of core structure data from a Petrel platform in the field of oil exploration and development to a MapGIS platform in the field of geological survey is realized, and the problem of cross-department and cross-software data barriers is solved.

The invention relates to a fault stress plugging coefficient plane characterization rapid implementation method and device, a medium and equipment. The method includes reading a regional stress direction angle and a fault polygon orientation data file. And calculating the fault stress plugging coefficient of each fault according to the regional stress direction angle and the fault polygonal orientation data file. And forming a plane graph by gridding the fault stress plugging coefficient of each fault. And reading the corresponding fault plane polygon, and externally tangent the plane graph by using the corresponding fault plane polygon to obtain a stress plugging coefficient plane graph reflecting the form of the fault plane. And respectively obtaining stress plugging coefficient plane graphs of different faults and combining the stress plugging coefficient plane graphs to obtain a stress plugging coefficient plane graph describing all the faults. According to the method, calculation is simple, only regional stress direction information needs to be provided, drilled well information does not need to be obtained, the fault plugging performance can be directly analyzed in a well-free and few-well area and an area with fast continental facies stratum phase change, and calculation efficiency is high.

The invention provides a coal face fault modeling method and device. The method comprises the steps that upper and lower wall coordinate string information of a coal face fault is acquired; extracting an elevation value at the intersection point of the fault and the coal seam contour line; acquiring a smooth projection line equation of a fault hanging wall and hanging wall curve in a plane, wherein the smooth projection line equation is obtained by fitting the hanging wall and hanging wall coordinate string information; according to the elevation value and the smooth projection line equation, predicting a plurality of control points of the upper and lower disks; determining a space intersection endpoint of the upper and lower plate curves; performing cubic spline curve fitting on the hanging wall curve and the footwall curve by combining a control point sequence integrated by the elevation value, the plurality of control points and the space intersection end intersection point with geological constraint conditions to obtain a hanging wall line and a footwall line of the fault; and constructing a fault plane model. Therefore, through the three-dimensional modeling method for the fault in the coal seam fusing geological control points, space curve fitting and multiple constraint conditions, the consistency of the precision of the model and geological interpretation is ensured, and the method is suitable for a three-dimensional digital modeling task of a complex fault geologic body.

This invention discloses a three-dimensional seismic assessment method for the activity of syn-sedimentary faults on gentle slopes in carbonate rocks, specifically relating to the field of oil and gas geological exploration. Its key points are: interpreting the fault plane of the syn-sedimentary fault and interpreting the stratigraphic plane of the fault-related strata; selecting strata for assessing fault activity from the interpretation results and constructing a sequence stratigraphic framework using these strata; calculating the sedimentary time of the fault activity period using the time corresponding to the sequence stratigraphic boundaries of the sequence stratigraphic framework; selecting multiple seismic profiles from the fault-stratigraphic plane interpretation results and obtaining the fault plane trajectory and stratigraphic plane trajectory lines passing through each seismic profile; calculating the average fault activity rate of each seismic profile at different periods based on the sedimentary time of the fault activity period; and assessing the activity of the syn-sedimentary fault based on the average fault activity rate of each seismic profile at different periods to obtain the seismic assessment results.

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 invention relates to the technical field of coal seam transformation engineering, in particular to a complex geologic structure coal seam directional hydraulic slotting and controllable acidification composite transformation method which comprises the steps that the in-situ crustal stress direction of a target coal seam section and the spatial orientation of a fault surface and a fold wing part are obtained, and the arrangement orientation of a directional hydraulic slotting is determined according to the in-situ crustal stress direction and the spatial orientation of the fault surface and the fold wing part; then directional hydraulic slotting is carried out in the drill hole to form initial directional slots which are distributed along the depth of the drill hole in a multi-cluster mode and have different directions, and the initial directional slots are used for limiting the crack initiation position and the crack initiation direction of the crack; on the basis, a controllable acid liquid system is injected into the coal seam section, so that the acid liquid enters the initial directional kerfs and the natural fractures of the coal seam in a low-viscosity state, the pH value of the system is changed by reacting with minerals in coal in the advancing process along the fractures, a gelling unit is triggered to form an in-situ temporary plugging area, and the follow-up acid liquid is guided to flow along different fracture channels; and after the fracture acidizing treatment is completed by continuously injecting acid liquor, flowback or replacement operation is carried out on the coal seam section.

The application provides a palaeogeomorphology recovery method and device, which comprises the following steps: constructing an initial palaeogeomorphology; determining a compaction coefficient based on porosity data and burial depth, and using the compaction coefficient to correct the residual thickness of the initial palaeogeomorphology to obtain a decompacted palaeothickness; determining an absolute palaeowater depth based on uranium element content, and subtracting the absolute palaeowater depth from the decompacted palaeothickness to obtain a palaeotopography of a sediment surface; identifying an unconformity surface, determining an uneroded area and an eroded area according to the unconformity surface, constructing a trend model using the stratigraphic thickness variation trend of the uneroded area, determining the eroded thickness of the eroded area based on the trend model, and obtaining a complete palaeogeomorphology after erosion recovery; taking a selected reference layer as a datum plane, reversely sliding an upper wall of a fault along a fault plane until the upper wall reference layer and a lower wall reference layer are spliced, performing trend interpolation filling on data gaps at the fault to obtain a target palaeogeomorphology after the influence of the fault is removed. The application improves the accuracy and objectivity of palaeogeomorphology recovery.

This invention discloses a method for identifying and intelligently completing outlier values ​​in bedrock fault plane dating data, relating to the field of engineering geology. The method involves calling a digital geological model of bedrock from a geological dating platform, extracting fault plane dating records, dividing the fault space, and constructing a set of structural units Ω. Based on the spatial contact relationships between structural units, an adjacency matrix A(i,j) is generated, and an evolutionary order constraint matrix E(i,j) is established. The dating status is assessed and outlier candidate units are identified by calculating the spatial evolution consistency index Kyz and the structural compatibility index Kzs of the structural unit pairs. For the outlier candidate units, a layered fitting is performed based on the structural hierarchy distance to generate a completed dating value T. b The results are then backfilled into the original dating values ​​and a spatial consistency check is performed again. The applicability of the completed results is determined by comparison. This method uses fault geometry and tectonic evolution sequence as constraints to locate and correct dating anomalies.

This invention provides a method, system, and storage medium for evaluating the transport capacity of oil-source faults, belonging to the field of oil and gas geological exploration. It includes: determining the hydrocarbon expulsion intensity of source rocks based on the source rock strata and organic matter characteristic parameters of the source rocks in the target study area; determining the vertical transport capacity of the oil-source fault based on the static rock pressure of the overlying strata, the regional principal compressive stress components, and the lower limit of pressure required for fault plane closure in the target study area; determining the lateral transport capacity of the oil-source fault based on the fault-sand contact length and fault gouge ratio; and determining fault transport capacity evaluation parameters based on the hydrocarbon expulsion intensity, vertical transport capacity, lateral transport capacity, and oil-source fault growth index. This invention, based on the influencing factors of fault transport capacity, quantitatively characterizes the comprehensive transport capacity of oil-source faults from multiple aspects, and can be used to predict the transport capacity of oil-source faults, helping to find favorable areas and strata for future oil and gas exploration.

The invention discloses a tunnel cross-fault deformation prediction method based on machine learning, and aims to solve the problems that cross-fault tunnel relative dislocation prediction is missing, monitoring data isomerism is difficult to unify and physical constraints are insufficient. According to the method, a fault plane coordinate system and an observation unified operator are constructed, a double-domain physical information neural operator or a Fourier neural operator is adopted to carry out direction weighted modeling, complementary constraints of contact and friction are applied to a fault interface, and implicit correction is implemented through micro-projection; and the multi-quantile, the over-limit probability and the time interval of the relative dislocation amount are output by combining the assimilation updating of uncertainty weighting and the quantile regression module, so that the technical effects of physical consistency and high-precision prediction of the cross-fault relative dislocation and completion of uncertainty quantization are realized.

The application provides a carbonate fault opening and closing evaluation method based on mechanical analysis, and the evaluation method comprises the following steps: S1, obtaining interpretation results of a target layer and a fault; S2, obtaining a plane distribution map and occurrence information of the fault; S3, obtaining compression stress F y suffered in a vertical fault plane direction; S4, calculating the compression resistance F f of pore fluid in a fault rock fracture; and S5, calculating a fault sealing factor R. The carbonate fault section stress is quantitatively obtained, so that an evaluation index for fault opening and closing evaluation is provided, a more effective basis for carbonate rock oil and gas reservoir exploration evaluation is provided, and the analysis and research on the carbonate rock reservoir accumulation rule are facilitated, so that the drilling success rate is improved and the exploration risk is reduced.

The application provides a noise constraint-based reflected wave and transmitted wave joint fault plane migration imaging method and belongs to the technical field of seismology and geophysical imaging. The method comprises the following steps: obtaining background noise data of a cross-fault dense array; performing cross-correlation calculation and surface wave dispersion inversion on the background noise data to obtain a high-resolution underground velocity structure model of a target fault adjacent area; obtaining seismic event data of the cross-fault dense array; taking the high-resolution underground velocity structure model as a constraint, performing wave field separation and back propagation on waveform data containing reflected wave signals and transmitted wave signals, and applying a cross-correlation imaging condition to obtain fault plane migration imaging results of the target fault. The application solves the problem of blurred fault plane migration imaging results and large spatial positioning errors caused by insufficient accuracy of the velocity structure model of the fault adjacent area.

An earthquake analysis and calculation system based on tidal theory includes a tidal theory calculation module, a fault parameter and stress projection module, an earthquake event import module, and an analysis module. The output of the tidal theory calculation module is connected to the input of the fault parameter and stress projection module, the output of the fault parameter and stress projection module is connected to the input of the earthquake event import module, and the output of the earthquake event import module is connected to the input of the analysis module. The tidal theory calculation module includes input time and spatial parameters and outputs a tidal stress tensor. The fault parameter and stress projection module includes input fault plane parameters and outputs tidal shear stress and normal stress. The earthquake event import module includes inputting earthquake event data and outputting tidal stress and earthquake event data, which are then transferred to the analysis module. The analysis module includes outputting a fused visualization result of tidal stress and earthquake events. This invention integrates solid tidal theory calculation and earthquake analysis.

The invention discloses a hydraulic fracturing induced fault slippage test system based on a large physical model, and the system comprises a test piece which comprises a lower fault and an upper fault embedded in the lower fault, and forms a fault plane; the two loading blocks are arranged on the upper surface and the lower surface of the test piece, the prestress connecting piece is arranged in the lower fault layer and the two loading blocks in a penetrating mode and connects the lower fault layer and the two loading blocks into a whole, the vertical force applying device acts on the upper end of the prestress connecting piece, and the horizontal force applying devices are arranged perpendicular to one another in the horizontal direction and act on one side of the test piece. The opposite side is provided with counter force by the fixed support body; the two groups of liquid injection pipes are respectively buried in the upper fault and the lower fault, and the liquid outlet ends of the groups of liquid injection pipes are far away from the fault surface; the displacement measuring device is arranged at the fault surface; and the continuous optical fibers are embedded in the test piece and are arranged in two circles around the center of the test piece. The system can simulate real three-dimensional crustal stress loading and hydraulic fracturing working conditions and synchronously monitor fault slippage displacement and fracture propagation parameters.

The application discloses a kind of near goaf prevention slurry invalid diffusion control method, comprising: step one: according to the position of goaf of mine mining plane figure, according to the relationship between regional management borehole and goaf, the invalid diffusion risk of grouting is classified;Step two: for the borehole with slurry running risk, when the spatial distance S1 of borehole trajectory distance goaf or distance fault plane L, carry out once grouting;Step three: when the spatial distance of borehole trajectory distance goaf is less than S1, carry out n times control grouting;When fault plane is drilled, carry out once control grouting;Step four: when the spatial distance S2 of borehole trajectory distance goaf or pass through fault plane L, carry out once check grouting.The application is based on the position of goaf, according to the spatial distance of borehole design trajectory and goaf and drilling fault case invalid diffusion risk of grouting is classified, realize the scientific control of slurry invalid diffusion.

The invention discloses a coal mine cutting area fault water conductivity comprehensive evaluation and dynamic prediction method based on multi-source information fusion, and the method comprises the steps: collecting fault-related data, and forming a standardized database; calculating normal stress and shear stress of a fault plane through mining disturbance data and a ground stress state, defining disturbance intensity, judging whether the fault is activated or not, and calculating activation parameters of the fault; processing the obtained parameters to form a standardized index matrix; determining a final weight vector; based on the standardized index matrix and the weight of each parameter, establishing a fault water conductivity comprehensive index model, calculating a fault water conductivity comprehensive index, grading the fault water conductivity, and dynamically correcting the water conductivity comprehensive index by combining the disturbance intensity, the disturbance sensitivity coefficient and the fault activation parameter; and dynamic prediction and risk zoning of fault water conductivity are realized. The method can accurately reflect the coupling relation between fault sealing attenuation and activation enhancement.

The invention discloses a fault slippage risk assessment method and system in a hydraulic fracturing process, and belongs to the technical field of micro seismic exploration and geomechanics. Micro seismic waveform data in the hydraulic fracturing process are acquired to determine a seismic source mechanism solution, and a micro seismic event of fault activation is controlled by tectonic stress; on the basis of an Anderson fault-ground stress smooth relation assumption, randomly selecting a plurality of seismic source mechanism solutions and scanning a fault friction coefficient, and obtaining fault instability of each nodal surface corresponding to each micro-seismic event of each seismic source mechanism solution under a Mohr-Coulomb fracture criterion; selecting a seismic source mechanism solution corresponding to the maximum fault instability as the input of the next iterative inversion of the iterative joint inversion algorithm, and updating the crustal stress tensor; and performing inversion on the updated crustal stress tensor to obtain a slippage trend and an expansion trend, and determining a fault slippage risk and a crack development probability in the hydraulic fracturing process. The method can solve the problem of stress field distortion caused by conjugate fault plane selection deviation in a traditional method.

This invention discloses a method for visually monitoring the dynamic process of fault slippage in an indoor environment based on CT scans. A cylindrical sample with a fault plane is sealed and encased, then placed in a triaxial pressure chamber and fixed to a CT stage. Hydraulic lines are connected to multi-source sensor circuits. After applying confining pressure, an axial load is applied at a set rate. Loading is paused at key mechanical state points while maintaining constant confining pressure, and a CT scan is performed. Simultaneously, CT scan image data, acoustic emission signals, local strain data, and stress-displacement mechanical data are acquired. Based on time-series CT images, three-dimensional dynamic reconstruction and spatiotemporal fusion analysis of multi-source data are performed to obtain four-dimensional visual information on the evolution of the internal structure during fault slippage. This invention achieves dynamic visualization of the internal structure of fault slippage through CT scanning and simultaneous multi-source monitoring, accurately identifying slip precursors and critical instability characteristics, providing high-fidelity experimental support for the study of geological disaster mechanisms.