Phase-controlled Heterogeneous Mechanical Parameter In-situ Stress Method

Abstract

The present invention provides a method for predicting ground stress of phase-controlled heterogeneous mechanical parameters. The method for predicting ground stress of phase-controlled heterogeneous mechanical parameters includes: step 1, establishing a lithofacies interpretation template and performing single-well lithofacies interpretation; step 2, according to All single well lithofacies data interpreted are combined with seismic attribute data to perform cross-well prediction and establish a 3D lithofacies model; Step 3, establish the time-difference relationship of compressional and shear waves of different lithofacies, and solve the mechanical parameters of each single well; Step 4, establish a lithofacies model. A three-dimensional heterogeneous mechanical parameter model under phase control; and step 5, determining the boundary conditions for the finite element simulation of in-situ stress, and predicting the three-dimensional in-situ stress field. This phase-controlled heterogeneous mechanical parameter ground stress prediction method realizes the finite element ground stress simulation under the condition of three-dimensional heterogeneous mechanical parameters, which is closer to the real mechanical parameter distribution of underground geological bodies than the conventional intralayer homogeneous mechanical parameter model features, thereby greatly improving the prediction accuracy of in-situ 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...

AI Technical Summary

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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