不同边界条件断层端部应力集中效应及对裂缝发育的启示

doi:10.11743/ogg20190121

Abstract

Abstract:

A fracture development play related to stress concentration of fault zone has high potentials for tight reservoirs and shale oil and gas.This study combined the methods of photo elastic physical modeling and finite element simulation to discuss the planar distribution patterns of stress field at fault's end,and took advantage of the elasticity mechanical theory to analyze the mechanism of stress field distribution.The results indicate that the fault's end displays the concentration of compression stress under the compression background.The stress concentration district extends outward in the shape of numeral "8" following a hyperbolic path centered on the most salient point of the fault's arc end,and its influence range increases with the growth of boundary stress intensity.The stress concentration degree tends to get stronger with the angle between boundary stress direction and fault strike increasing when the angle in the range of 0° to 90°,and reaches its summit at 75°.Besides,both the shape and the modeling method of fault have a significant impact on fault's end stress field.All in all,the stress concentration district at the fault's end has great potentials for the exploration and development of fracture reservoirs.

Key words: photoelastic, finite element, stress concentration, fracture, fault, tight reservoir, shale

CLC Number:

TE121.2

Qiu Dengfeng, Yun Jinbiao, Liu Quanyou, Zhou Yan, Ning Fei, Song Haiming. The stress concentration effect at fault end under various boundary conditions and its implications for fracture development[J]. Oil & Gas Geology, 2019, 40(1): 205-214.

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The stress concentration effect at fault end under various boundary conditions and its implications for fracture development

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