塔里木盆地库车坳陷断层相关褶皱对裂缝发育的控制

doi:10.11743/ogg20200311

Abstract

Abstract: The fracture prediction has always been one of the hotspots and difficulties in the petroleum geology study,and the key reason lies in the ambiguous understanding on the main controlling factors and mechanisms of fracture development.In the multi-stage evolution process,a large number of structural fractures,complicated in spatial distribution,were induced from or associated with the fault-related folds in the Kuqa Depression.The study takes the Keshen,Dabei,Dina and Kela gas fields as examples,and makes a detailed statistical analysis of fractures in a single well via outcrop and core observation and imaging logging analysis combined with the regional tectonic setting.The fracture development stages are determined and the paleo-tectonic stress field is restored by structural trace analysis and rock acoustic emission test.Guided by the fault-related fold theories,we select the Kuqa river outcrop to restore the tectonic evolution process of each fold,and compare and analyze the development pattern and formation mechanisms of paragenetic fractures through finite element numerical simulation.Finally,the evolutionary geological model of the paragenetic fracture system in the relevant folded region of Kuqa Depression is established through "dynamic and static analyses",and the dominant fracture deve-lopment zone is assessed.The results show that the Keshen-Dabei gas field is in a typical pattern of paragenetic fractures with folds of top pop-up type,and the Dina-Kela gas field is in a typical paragenetic fracture pattern of top-graben type,both of which provide effective guidance for efficient exploration well emplacement of the piedmont thrust belt in Kuqa Depression and comprehensive management of old oil/gas fields.

Key words: paragenetic fracture system of fault-related folds, tectonic evolution, thrust belt, Kuqa Depression, Tarim Basin

CLC Number:

TE121.1

Feng Jianwei, Sun Jianfang, Zhang Yajun, Dai Junsheng, Wei Hehua, Quan Lianshun, Ren Qiqiang, Zhao Libin. Control of fault-related folds on fracture development in Kuqa Depression,Tarim Basin[J]. Oil & Gas Geology, 2020, 41(3): 543-557.

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Control of fault-related folds on fracture development in Kuqa Depression,Tarim Basin

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