Method for quantitatively predicting mudstone structure crack based on elastic-plastic mechanics

A plastic mechanics and mudstone technology, applied in seismology for well logging and seismic signal processing, etc., can solve the problems of less coring, difficult fracture prediction, large well spacing, etc., to reduce risks and costs, avoid Effects of lost circulation and wellbore instability accidents

Pending Publication Date: 2021-12-21
CNOOC TIANJIN BRANCH
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Problems solved by technology

[0003] At present, a large number of studies on fractures are mainly concentrated in the reservoir section, and relatively mature geological, geophysical and mechanical identification and prediction methods have gradually formed, but the research on mudstone and shale fractures is still at the stage of s

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  • Method for quantitatively predicting mudstone structure crack based on elastic-plastic mechanics
  • Method for quantitatively predicting mudstone structure crack based on elastic-plastic mechanics
  • Method for quantitatively predicting mudstone structure crack based on elastic-plastic mechanics

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[0089] Example one

[0090] Reference figure 1 Addition Figure 4 As shown, embodiment of the present invention proposes a method of quantifying a crack of mudstone based on elastoplastic mechanics, which is a method of quantifying a crack of mudstone structural cracks comprising:

[0091] Step 1: Analysis and statistical analysis and statistics of the construction cracks of single wells;

[0092] Step 2: Logo to perform rock mechanics experiment and mechanical parameters;

[0093] Step 3: Calculate the brittle index and restore the ancient mechanics parameters;

[0094] Step 4: Damstone Yield - Destroying Composite Strength Standards;

[0095] Step 5: Deficiency of mudstone construction crack mechanics parameter model;

[0096] Step 6: Geological model construction and ancient stress state recovery;

[0097] Step 7: Sanwei Ancient Stress Field Simulation and Crack Quantitative Prediction.

[0098] Specifically, this scheme is aimed at the thick layer of mud rock sections of plastic...

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Abstract

The invention provides a method for quantitatively predicting mudstone structure fractures based on elastic-plastic mechanics, and relates to the technical field of oil exploration and development. The method for quantitatively predicting the mudstone tectonic fissures comprises the following steps: analyzing and counting the tectonic fissures of a single-well thick-layer mudstone section; carrying out rock mechanics experiment and mechanical parameter logging interpretation; calculating a brittleness index and a recovery paleomechanical parameter; establishing a mudstone yield-failure composite strength criterion; deducing a mudstone structure fracture mechanical parameter model; constructing a geologic model and recovering an ancient stress state; and simulating a three-dimensional ancient stress field and quantitatively predicting a crack. According to the technical scheme, the problem of establishment of the mudstone yield-fracture composite strength criterion under the brittleness index constraint is solved, and the method is suitable for crack quantitative prediction work of any mudstone-containing interlayer type clastic rock reservoir.

Description

technical field [0001] The present application relates to the technical field of petroleum exploration and development, in particular to a method for quantitatively predicting structural fractures in mudstone based on elastic-plastic mechanics. Background technique [0002] With the continuous development of oil and gas exploration and development and the continuous improvement of mining technology, complex fault block oil and gas reservoirs, lithologic oil and gas reservoirs, unconventional tight sandstone oil and gas reservoirs and fractured oil and gas reservoirs have attracted more and more attention; The basin is dominated by continental sedimentary strata. Frequent lake level changes have resulted in frequent vertical sandstone and mudstone changes. Under the action of multi-stage tectonic movements, a series of different mechanical properties have also developed in mudstone sections of different thicknesses. The cracks are mainly low-angle shear cracks, and the cracks...

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Application Information

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IPC IPC(8): G01V1/50
CPCG01V1/50
Inventor 邓津辉谭忠健曹军张向前杨占许袁亚东彭超
Owner CNOOC TIANJIN BRANCH
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