Method for determining fault activity in structural stable period

A stable stage and fault technology, applied in the field of oil and gas exploration, can solve the problems of limited popularization and application, unsuitable analysis of fault activity stages in the structural stable stage, difficulty in obtaining downhole core samples, etc., and achieves the effect of wide applicability.

Active Publication Date: 2021-07-09
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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AI-Extracted Technical Summary

Problems solved by technology

However, it is difficult to obtain downhole core samples drilled in fault zones, which limits the popularization and application of this method in the study of oil and gas accumulation.
[0004] To sum up, the existing f...
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Method used

According to the present invention, by obtaining the stress Mohr circle and critical rupture envelope of fault rock in different geological history periods, the stress Mohr circle and corresponding critical rupture envelope of fault rock in different geological history periods are respectively Compare and determine the o...
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Abstract

The invention relates to a method capable of accurately determining multi-stage active periods of a fault in a structural stable period. The method comprises the following steps of acquiring vertical principal stresses in different periods based on a vertical principal stress-depth relationship of a current stratum and stratum burial depths in different periods; determining the minimum principal stress in different periods based on the pressure-stress coupling relation of the current stratum and the stratum pressure and the vertical principal stress in different periods; based on the maximum principal stress, the minimum principal stress and the formation pressure in the different periods, the maximum effective principal stress and the minimum effective principal stress in the different periods being obtained; determining stress Moire circles in different periods based on the maximum effective principal stress and the minimum effective principal stress; based on the internal friction angle-burial depth relation of the current stratum and the stratum burial depths in different periods, critical fracture envelope lines in different periods being obtained; comparing the stress Moire circles at different periods with respective corresponding critical fracture envelope lines; and judging the opening and closing properties in different periods according to the position relationship between the stress Moire circle and the critical fracture envelope line.

Application Domain

Geological measurements

Technology Topic

GeophysicsFriction angle +2

Image

  • Method for determining fault activity in structural stable period
  • Method for determining fault activity in structural stable period
  • Method for determining fault activity in structural stable period

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0075] Example
[0076] Experimental analysis of rock difference strain (Sun Lianhuan, Junggar Basin Wall Stability Research [D], China Petroleum University, 2009) shows that the characteristics of the abdominal region of the Junggar Basin have vertical main stress (σ V )> The maximum main stress of level (σ H )> Level minimum main stress (σ h Features, that is, the stress conditions in accordance with the structural stability period according to the present invention, such as figure 1 Indicated.
[0077] The acoustic wave log curve of the fault drilling is obtained by a conventional density log method. figure 2 The left figure shows the density logging curve of the abdomen drilling of the abdomen area of ​​the Junggar Basin. According to this density log curve, the rock bulk density is determined by the depth change, and the integration of the rock density-depth function equation (1) is obtained, and the vertical main stress is large, determined to determine the vertical main stress (ie the maximum main stress σ). 1 ) And deep relationship (see figure 2 Right map):
[0078] σ V = 0.0106 · h 1.087 (11)
[0079] In the formula, σ V For vertical main stress, MPa; H is a buried depth, m.

PUM

PropertyMeasurementUnit
Density1.12g/cm³
Permeability0.1µm²
Permeability1E-7µm²

Description & Claims & Application Information

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