A Quantitative Analysis Method for Current Azimuth Turning of In-situ Stress in Fold Developed Area

Abstract

A quantitative analysis method for the azimuthal shifting of current in-situ stress in fold-developed areas, which is applicable to the fields of geology and oil and gas exploration and development. Firstly, set vertical boreholes in the research area where folds are developed, collect borehole data, calculate and determine the depth of the fold neutral plane where the boreholes are located, obtain the in-situ stress test information of the boreholes and the solution of fractures induced by imaging logging drilling and borehole wall collapse. Translate, obtain the current in-situ stress components in the x-axis and y-axis at the depth of the fold neutral surface, and record it as the regional present in-situ stress; obtain the formation curvature at different depths of the borehole according to the analysis of the seismic data volume, and calculate the borehole The magnitude of the stress component at the distance h from the inner fold neutralization surface is recorded as the local current in-situ stress; the stress vector synthesis is performed on the regional present in-situ stress and the local present in-situ stress, and the direction of the vector synthesis is the borehole inner distance fold neutralization The current in-situ stress azimuth at the distance h from the surface can be used to quantitatively analyze the direction of the current in-situ stress. The steps are simple and the effect is good.

Description

technical field [0001] The invention relates to a quantitative analysis method, in particular to a quantitative analysis method for the azimuth diversion of the current in-situ stress in the fold development area used in the fields of geology and oil and gas exploration and development. Background technique [0002] Today's in-situ stress refers to the internal stress currently existing in the earth's crust, which is a "field" that is constantly changing with time. In the fields of structural geology and oil and gas exploration and development, the analysis of current in-situ stress is helpful for in-depth understanding of the crustal stress state, guiding oil and gas exploration and development, and utilization of hot dry rock resources. [0003] In recent years, my country's deep-ultra-deep clastic natural gas exploration has made a major breakthrough in the Kelasu structural belt in the Kuqa depression of the Tarim Basin. The Kelasu structural belt is rich in oil and gas...

AI Technical Summary

Problems solved by technology

[0004] The geomechanical evaluation of the reservoirs in the Kelasu structural belt found that with the increase of burial depth, the azimuth of the current in-situ stress turns. Determining the current in-situ stress orientation shift in the fold development area can ensure the safe implementation of deep-ultra-deep engineering in this area and improve the efficiency of oil and gas resource development

Images