Phase control heterogeneous mechanical parameter crustal stress prediction method

Abstract

The present invention provides a phase control heterogeneous mechanical parameter crustal stress prediction method, comprising: a first step of establishing a petrographic interpretation template and performing single well petrographic interpretation; a second step of performing inter-well prediction according to the interpreted all single well petrographic data in combination with seismic attribute data, and establishing a three-dimensional petrographic model; a third step of establishing a p-wave and s-wave time difference relation of different petrographic facies, and solving each single well mechanical parameter; a fourth step of establishing a three-dimensional heterogeneous mechanical parameter model under the control of petrographic facies; and a fifth step of determining a boundary condition of crustal stress finite element simulation, and predicting a three-dimensional crustal stress field. The phase control heterogeneous mechanical parameter crustal stress prediction method achieves finite element crustal stress simulation under a three-dimensional heterogeneous mechanical parameter condition, and the simulation model is closer to real mechanical parameter distribution characteristics of underground geologic bodies than a conventional inner-layer homogeneous mechanical parameter model, thereby greatly improving prediction accuracy of crustal stress.

Description

technical field [0001] The invention relates to the technical field of low-permeability oil field development, in particular to a stress prediction method of phase-controlled heterogeneous mechanical parameters. Background technique [0002] At present, domestic in-situ stress research technologies mainly include on-site stress measurement, logging stress interpretation, core stress measurement and in-situ stress field simulation technology. At present, the main applications of on-site stress measurement are microseismic detection and fracturing construction curves, which are direct measurement methods. Core stress measurement mainly includes using paleomagnetism and acoustic anisotropy to test the horizontal maximum principal stress direction; using differential strain test and acoustic emission test to calculate the magnitude of the triaxial principal stress. In-situ stress interpretation of well logging mainly uses dip logging and image logging to interpret the direction...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method to solve the two major shortcomings of the current domestic in-situ stress prediction boundary conditions, the manual multiple attempts, the heavy workload and the low accuracy of the intra-layer homogeneous model, to provide an optimized inversion to automatically determine the boundary conditions and In-situ stress prediction method considering three-dimensional heterogeneity of mechanical parameters

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