塔里木盆地顺南地区走滑断裂派生裂缝发育规律及预测

doi:10.11743/ogg20180510

Abstract

Abstract: Induced fracture from strike-slip faulting is an important type of reservoir space of carbonates,thus has been drawing more and more attention.However,its mechanism and scale are not clear now.In order to delineate fracture system controlled by strike-slip faults,we carried out quantitative evaluation by means of comprehensive application of core,image logging data and numerical simulation.After the identification and description of structural fractures in Shunnan area,the characters of fracture development controlled by strike-slip faults were summarized,and their main controlling factors were analyzed.Then through the construction of geological model,the induced local stress field and the deformation process of the strike-slip fault were simulated by using the finite element method.What's more,the influential factors and distribution of the induced fractures from strike-slip faults were discussed through analysis of stress-strain,and the pattern of fracture development in the 3D seismic acreage of Shunnan area was predicted further.The results show that(1) the structural fracture controlled by major strike-slip faults is the main type of fractures in Shunnan area,its strike is basically consistent with that of the faults,and it is dominated by high angle-nearly vertical shear fractures.Besides,fracture development is closely related to the segmentation and lithology of faults.(2) The extent of induced fractures from strike-slip faults is 1.25-6.5 times as many as the width of the core of fault zone,and the intensity and extent of fracturing in the pull-apart segments of faults are significantly larger than those in the strike-slip segments.(3) Along the lithologic interface,the scope of fracture development controlled by strike-slip faults expands obviously.The higher the competency of rocks is,the easier it is for the development of induced fractures,and the larger the extent of induced fractures becomes.(3) The Late Caledonian-Early Hercynian fractures are mainly distributed along the NE-trending strike-slip faults as a whole in the 3D seismic acreage in Shunnan area,and the fractures in the Yingshan Formation are better developed those that in the Yijiangfang Formation.

Key words: stress, numerical simulation, prediction, fracture, strike-slip fault, Ordovician, Shunnan area, Tarim Basin

CLC Number:

TE121.2

Zhang Jibiao, Zhang Zhongpei, Wang Bifeng, Deng Shang. Development pattern and prediction of induced fractures from strike-slip faults in Shunnan area,Tarim Basin[J]. Oil & Gas Geology, 2018, 39(5): 955-963,1055.

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Development pattern and prediction of induced fractures from strike-slip faults in Shunnan area,Tarim Basin

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