CN-122021093-A - Construction method and analysis method of analysis function of low-order-level sliding fracture

CN122021093ACN 122021093 ACN122021093 ACN 122021093ACN-122021093-A

Abstract

The embodiment of the invention relates to the field of geologic structure analysis, and discloses a construction method and an analysis method of an analysis function of low-order sliding fracture, comprising the steps of obtaining an actual measurement value of a reservoir geomechanical parameter of a research area; the method comprises the steps of establishing a three-dimensional geologic model of a research area by using measured values of geomechanical parameters of a reservoir, carrying out finite element simulation analysis on the three-dimensional geologic model, extracting simulation values of parameters to be researched, initial values of widths among main fractures and initial values of slip distances between two fractured discs of low-order-level sliding fracture, carrying out linear fitting by using the simulation values of the parameters to be researched, the initial values of the widths among the main fractures and the initial values of the slip distances between the two fractured discs to obtain an analysis function of low-order-level sliding fracture, wherein the analysis function of the low-order-level sliding fracture is used for quantifying the relation among the parameters to be researched, the widths among the main fractures and the slip distances between the two fractured discs.

Inventors

Ru Zhixing
LIU YUQING
DENG SHANG
GUO KANGKANG
LIU SHUANG

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司石油勘探开发研究院

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The method for constructing the analysis function of the low-order sliding fracture is characterized by comprising the following steps of: Obtaining an actual measurement value of a reservoir geomechanical parameter of a research area; constructing a three-dimensional geologic model of the research area by utilizing the measured value of the geomechanical parameter of the reservoir; Performing finite element simulation analysis on the three-dimensional geological model, and extracting simulation values of parameters to be researched of low-order sliding fracture, initial values of the width between main fracture and initial values of the sliding distance between two broken discs; And performing linear fitting by using the simulation value of the parameter to be researched, the initial value of the width between the main fractures and the initial value of the slip distance between the two fractured discs to obtain an analysis function of low-order-level slip fracture, wherein the analysis function of the low-order-level slip fracture is used for quantifying the relation among the parameter to be researched, the width between the main fractures and the slip distance between the two fractured discs.
2. The method according to claim 1, wherein the step of performing finite element simulation analysis on the three-dimensional geologic model to extract simulation values of parameters to be studied of low-order level slip fracture, initial values of the width between trunk fractures, and initial values of the slip distances between two fractures comprises: Carrying out finite element simulation analysis on the three-dimensional geological model, and extracting a simulation value of the ratio of the development area of the broken belt with low-order sliding fracture, a simulation value of an included angle between the trend of the broken belt with low-order sliding fracture and the trend of the main sliding fracture, an initial value of the width between main sliding fractures and an initial value of the sliding distance between two broken discs, wherein the simulation value of the parameter to be researched comprises the simulation value of the ratio of the development area of the broken belt and the simulation value of the included angle between the trend of the broken belt and the trend of the main sliding fracture; the step of performing linear fitting by using the simulation value of the parameter to be researched, the initial value of the width between the main fractures and the initial value of the slip distance between the two fractured discs to obtain the analysis function of the low-order sliding fracture comprises the following steps: Performing linear fitting by using a simulation value of the growth area ratio of the broken belt, an initial value of the width between the main fractures and an initial value of the slip distance between the two broken discs to obtain an analysis function of the low-order sliding fracture; and performing linear fitting by using an imitation value of an included angle between the trend of the crushing belt and the trend of the main sliding fracture, an initial value of the width between the main sliding fractures and an initial value of the sliding distance between two broken discs to obtain another analysis function of the low-order sliding fracture.
3. The method according to claim 1, wherein the step of obtaining the analysis function of the low-order level slip break by performing linear fitting using the simulation value of the parameter to be studied, the initial value of the width between the main breaks and the initial value of the slip distance between the two broken discs comprises: Calculating the ratio between the initial value of the width between the trunk breaks and the initial value of the slip distance between the two broken discs to obtain the initial value of the comprehensive parameters of the trunk breaks; And performing linear fitting by utilizing the simulation value of the parameter to be researched and the initial value of the comprehensive parameter of the trunk fracture to obtain the analysis function of the low-order sliding fracture.
4. A method of constructing a three-dimensional geologic model of the region of interest using measured values of the reservoir geomechanical parameters, comprising: And carrying out semicircular processing on two ends of the independent component, and constructing initial conditions and boundary conditions of the three-dimensional geologic model of the research area by using actual geologic features of the reservoir and actual measured values of geomechanical parameters of the reservoir.
5. A construction method according to any one of claims 1 to 3, wherein the step of performing finite element simulation analysis on the three-dimensional geologic model, extracting simulation values of parameters to be studied of low-order step slip fracture, initial values of inter-trunk fracture width, and initial values of slip distances of two discs at fracture, comprises: Carrying out finite element simulation analysis on the three-dimensional geological model, and extracting a simulation value of a tensile main strain, a simulation value of an extrusion main strain, a simulation value of a low-order-level walk-slip fracture parameter to be researched, an initial value of a width between main fracture and an initial value of a slip distance between two fracture discs; the method further comprises the steps of: When the simulation value of the main strain of the tension is larger than the strain limit of the tension, outputting the result of the low-order sliding fracture to generate the tension crack, or, When the simulation value of the extrusion main strain is larger than the extrusion strain limit, outputting a result of the low-order sliding fracture to generate the compression shear type crack.
6. A method of analyzing a low-order walk-slip fracture, comprising: Obtaining an actual measurement value of the width between trunk breaks of a study area, an actual measurement value of the slip distance between two broken discs, and a low-order-level slip break analysis function constructed by the low-order-level slip break analysis function construction method according to any one of claims 1 to 5; And calculating according to the actual measurement value of the width between the main fractures and the actual measurement value of the slip distance between the two broken discs based on the analysis function of the low-order-level slip fracture, and obtaining the estimated value of the parameter to be researched of the low-order-level slip fracture.
7. A device for constructing an analysis function of a low-order walk-slip fracture, comprising: The mechanical parameter acquisition module is used for acquiring the actual measurement value of the geomechanical parameter of the reservoir in the research area; The geological model construction module is used for constructing a three-dimensional geological model of the research area by utilizing the measured value of the geomechanical parameter of the reservoir; the parameter simulation extraction module is used for carrying out finite element simulation analysis on the three-dimensional geological model and extracting simulation values of parameters to be researched of low-order level sliding fracture, initial values of the width between main fracture and initial values of the sliding distance between two fracture discs; And the parameter linear fitting module is used for carrying out linear fitting by utilizing the simulation value of the parameter to be researched, the initial value of the width between the main fractures and the initial value of the slip distance between the two fractured discs to obtain an analysis function of low-order-level sliding fracture, wherein the analysis function of the low-order-level sliding fracture is used for quantifying the relation among the parameter to be researched, the width between the main fractures and the slip distance between the two fractured discs.
8. An analysis device for low-order slip fracture, comprising: The measured value acquisition module is used for acquiring the measured value of the width between main fracture of the research area, the measured value of the slip distance between two fracture discs and the low-order-level sliding fracture analysis function constructed by the low-order-level sliding fracture analysis function construction method according to any one of claims 1 to 5; And the estimated value calculation module is used for calculating according to the actual measurement value of the width between the main trunk fractures and the actual measurement value of the slip distance between the two broken discs based on the analysis function of the low-order-level slip fracture, so as to obtain the estimated value of the parameter to be researched of the low-order-level slip fracture.
9. An electronic device, comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of constructing the analysis function of a low-order level walk-slip break as claimed in any one of claims 1 to 5 or the method of analyzing a low-order level walk-slip break as claimed in claim 6.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method of constructing the analysis function of low-order level walk-slip break according to any one of claims 1 to 5, or the method of analyzing low-order level walk-slip break according to claim 6.

Description

Construction method and analysis method of analysis function of low-order-level sliding fracture Technical Field The embodiment of the invention relates to the field of geological structure analysis, in particular to a construction method and an analysis method of an analysis function of low-order-level sliding fracture. Background A large number of multi-order sliding fracture systems are developed in deep layers of large laminated basins. Taking the northbound area of the Tarim basin as an example, exploration practice has fully proved that the multi-order sliding fracture of the through source has the functions of controlling storage, controlling storage and controlling enrichment, and is an important target type for deep oil and gas exploration and development. However, low-order walk-slip breaks have very weak mobility, lack significant deformation markers, and are more concealed than backbone breaks. Because the resolution ratio of the deep seismic data is very limited, the seismic imaging of the low-order-level walk-slip fracture is difficult, and the accurate identification and efficient exploration of the low-order-level walk-slip fracture are restricted. At present, the research work of low-order-level sliding fracture is carried out by adopting the technical means such as a wavelet multi-scale edge detection technology, a 3D U-Net convolutional neural network model, a curvature azimuth reinforcement technology and the like. These studies have had some impetus for the identification of shallow low-order step-slip fractures. However, the low-order-level sliding fracture of the deep basin generally has the problems of small breaking distance, short longitudinal and transverse extension and the like, so that the low-order-level sliding fracture only shows the responses of very slight distortion, weak amplitude and the like of the same phase axis on the seismic section, and therefore, the low-order-level sliding fracture has strong concealment, and the current technical means are difficult to accurately analyze. Disclosure of Invention The invention aims to at least provide a construction method and an analysis method of an analysis function of low-order-level sliding fracture, which can at least solve the problem that the low-order-level sliding fracture is difficult to analyze due to strong concealment, and at least achieve the technical effect of analyzing the low-order-level sliding fracture. To solve the above technical problems, at least one embodiment of the present application provides a method for constructing an analysis function of low-order level walk-slip fracture, including: Obtaining an actual measurement value of a reservoir geomechanical parameter of a research area; constructing a three-dimensional geologic model of the research area by utilizing the measured value of the geomechanical parameter of the reservoir; Performing finite element simulation analysis on the three-dimensional geological model, and extracting simulation values of parameters to be researched of low-order sliding fracture, initial values of the width between main fracture and initial values of the sliding distance between two broken discs; And performing linear fitting by using the simulation value of the parameter to be researched, the initial value of the width between the main fractures and the initial value of the slip distance between the two fractured discs to obtain an analysis function of low-order-level slip fracture, wherein the analysis function of the low-order-level slip fracture is used for quantifying the relation among the parameter to be researched, the width between the main fractures and the slip distance between the two fractured discs. At least one embodiment of the present application also provides an analysis of low-order step slip breaks, comprising: obtaining an actual measurement value of the width between trunk breaks of a research area, an actual measurement value of the slip distance between two broken discs, and a low-order-level slip break analysis function constructed by the low-order-level slip break analysis function construction method in any embodiment; And calculating according to the actual measurement value of the width between the main fractures and the actual measurement value of the slip distance between the two broken discs based on the analysis function of the low-order-level slip fracture, and obtaining the estimated value of the parameter to be researched of the low-order-level slip fracture. At least one embodiment of the present application also provides a device for constructing an analysis function of low-order level walk-slip fracture, including: The mechanical parameter acquisition module is used for acquiring the actual measurement value of the geomechanical parameter of the reservoir in the research area; The geological model construction module is used for constructing a three-dimensional geological model of the research area by utilizing the measured value o