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Intelligent inversion method for far-field stress state

A stress state and far-field technology, applied in the field of geological stress field simulation, can solve the problems of cumbersome efficiency and manual intervention

Pending Publication Date: 2021-03-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional far-field stress state inversion is usually achieved by repeated trial calculations and repeated analysis of the results. The whole process requires a lot of manual intervention, which is cumbersome and inefficient.

Method used

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  • Intelligent inversion method for far-field stress state

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Embodiment 1

[0041] Such as figure 1 As shown, the intelligent inversion method of the far-field stress state described in the present invention is suitable for the unknown far-field stress state. On the basis of the existing geological model, through cyclical trials, the efficient method for finally determining the far-field stress state that meets the actual geological conditions A fast and intelligent method belongs to the technical field of geological stress field simulation. The present invention comprises the steps:

[0042] S1: Construction of 3D geological model: Select the region where the far-field stress state is unknown and some constraint points are known as the geological region to be constructed, and use the 3D modeling software to establish a geological region that conforms to the actual reservoir geology based on the geological structure map of the geological region. 3D geological model to reflect the spatial distribution characteristics of the undulations of the actual f...

Embodiment 2

[0071] Assuming that the study area with unknown far-field stress state is located in the Zhanhua Sag belonging to the Jiyang Depression in the Bonan Sag, it is a third-order structural unit of the Zhanhua Sag, and the north is controlled by the Chengnan fault zone and the Chengdong Uplift , connected with Chenjiazhuang in the south, controlled by the Guxi fault, Gubei depression and Gudao bulge in the east, and connected in the southeast by the Kenxi horst, Sanhezhuang depression and Guxi depression. Such as figure 2 As shown, the Bonan subsag is a broom-shaped fault that is high in the north and low in the south, and is clamped by two basin-dip syngeneic faults and the Guxi fault. Block Yi 176 is located in the Yi 176-Boshen 4 fault step belt of Bonan Oilfield, with a controlled area of ​​49.8km 2 . The stratum in the study area is the 3rd and 4th sand formations of the upper sub-member of Shahejie Formation, with a cumulative buried depth of 3200-4500 meters. A total of...

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Abstract

The invention relates to an intelligent inversion method for a far-field stress state, and belongs to the technical field of geological stress field simulation. The method comprises the following steps: S1, constructing a three-dimensional geologic model; s2, collecting rock mechanics parameters, including the following small steps: S21, determining a principal stress value of a constraint point;s22, determining a principal stress direction of a constraint point; s23, determining heterogeneous parameters of the constraint points; s3, loading a far-field stress state; s4, calculating, analyzing and judging errors; and S5, correcting the far-field stress state. Initial work of numerical simulation of geological stress fields of various large oil fields in China can be rapidly and accuratelyachieved, three-dimensional space distribution characteristics of crustal stress can be defined, and numerical values and directions of three-way principal stress of various positions of a work areaand the far-field stress state applied to the work area can be obtained; the method has great practical significance for solving the problems of difficulty in manual intervention and adjustment of thefar-field stress state of the geological model, low efficiency and the like.

Description

technical field [0001] The invention relates to an intelligent inversion method for a far-field stress state, belonging to the technical field of geological stress field simulation. Background technique [0002] Numerical simulation method, as a method of in-situ stress research, plays an important role in the process of oilfield exploration and development. There are many kinds of numerical simulation methods (finite element, discrete element, etc.), but no matter which method is used, it is inseparable from geological modeling, boundary loading and solution operations, in which the far-field stress state is an unknown quantity, and its inversion process is the whole The core of stress field numerical simulation is that whether the far-field stress state is reasonable or not not only determines the boundary loading conditions, but also ultimately determines the accuracy and rationality of the simulation results. The traditional far-field stress state inversion is usually r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 汪必峰刘子阳刘敬寿
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)