Quantitative analysis method for current ground stress azimuth turning in wrinkle development area

A quantitative analysis, current ground technology, applied in the field of quantitative analysis, can solve the problem that there is no effective method for quantitative analysis of the azimuthal orientation of stress in the fold development area

Active Publication Date: 2020-08-11
CHINA UNIV OF MINING & TECH
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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

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  • Quantitative analysis method for current ground stress azimuth turning in wrinkle development area

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] like figure 1 As shown, the quantitative analysis method of the azimuth turning of the present in-situ stress in the fold development area of ​​the present invention, the steps are as follows:

[0022] Step 1: Set multiple vertical boreholes in the study area where folds develop, collect the conventional logging data of any borehole A in the study area, and use the acoustic time difference logging curve and density logging curve to calculate the rock density at different depths of the borehole A. Young's modulus and Poisson's ratio, according to the size of Young's modulus, the layer system is coarsened, and Young's modulus (E max -E min ) / 10 is the interval coarsening layer system, that is, E min ~E min +(E max -E min ) / 10 is a layer system, E min +(E max -E min ) / 10~E min +(E max -E min ) / 5 is another layer system, and so on, among ...

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Abstract

The invention discloses a quantitative analysis method for current ground stress azimuth turning in a wrinkle development area, and is applicable to the field of geology and oil-gas exploration and development. Firstly, a vertical drill hole is formed in a research area where wrinkles are developed, drill hole data are collected, the wrinkle neutralization face depth of the position where the drill hole is located is calculated and determined, interpretation of drill hole ground stress test information, imaging logging well drilling induced cracks and well wall caving is obtained, and the component sizes of current ground stress in the x-axis direction and the y-axis direction at the wrinkle neutralization face depth are obtained and are recorded as the regional current ground stress; stratum curvatures at different depths of the drill hole are obtained through seismic data volume analysis, and the magnitude of a stress component at the position h away from the wrinkle neutralization surface in the drill hole is obtained through calculation and recorded as local current ground stress; and stress vector synthesis is carried out on the regional current ground stress and the local current ground stress, the direction of vector synthesis is the current ground stress orientation at the position, h away from the wrinkle neutralization face, in the drill hole, and therefore quantitative analysis of current ground stress direction turning is achieved. The quantitative analysis method is simple in steps and good in using effect.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/002E21B49/00
CPCE21B47/00E21B49/00
Inventor 鞠玮张辉徐珂申建吴财芳杨兆彪秦勇孙维凤
Owner CHINA UNIV OF MINING & TECH
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