Differential segmental activities of Qianbei fault zone in Jianghan Basin and its evolution
LIU Aiwu1, TANG Daqing2, GUO Libin1, WEN Hui1, TANG Wenxu1, ZOU Shuai2
1. Exploration and Development Research Institute of Jianghan Oilfield Company, SINOPEC, Wuhan, Hubei 430223, China; 2. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China
Abstract：The Qianbei fault zone can control sedimentary filling and differential enrichment of oil and gas,and it demonstrates huge structural and tectonic differences in different segments. The previous geo-〖JP〗logical understanding of the Qianbei fault zone and the analysis accuracy of the tectonic style can no longer meet the needs of the current fine oil and gas exploration. Therefore,to finely analyze the segmental differences of the Qianbei fault zone and their cause evolution,this paper divides the Qianbei fault zone into six segments from the west to the east in accordance with the fault types,geometrical characteristics,and cause evolution,namely,Xinnong Segment,Zhongshi Segment,Banghu Segment,Tankounan Segment,Tankoubei Segment,and Sanhechang Segment. Significant differences in tectonic characteristics are identified in certain fault segments of the Qianbei fault zone:Fault terraces and compound grabens are developed in Xinnong Segment, and "Jingsha Red Walls" and complex fault blocks are developed in Zhongshi Segment; the structure in Banghu Segment is represented by synthetic fault terraces,which are relatively simple; armchair-shaped main faults and complex fault blocks are found in Tankounan Segment,and deck chair-shaped main faults and complex fault blocks are developed in Tankoubei Segment; Sanhechang Segment features a combination of gently-dipping slopes,fault terraces,and graben-horst structure. The differential segmental activities of the Qianbei fault zone are controlled by multi-phase and multi-directional regional stress with different properties,and "Jingsha Red Walls",salt layers, deep magmation,and pre-existing structures also exert a certain influence on those activities. The fault activities have experienced four stages of evolution,i.e.,the rift phase (the deposition period of Shashi Formation-lower 4th member of Qianjiang Formation),the fault-depression phase (the deposition period of the upper 4th member of Qianjiang Formation-Jinghezhen Formation),the structural inversion phase (the late deposition period of Jinghezhen Formation and pre-deposition period of Guanghuashi Formation),and the depression and reform-finalization phase (the deposition period of Guanghuashi Formation-Pingyuan Formation). The results can provide a theoretical reference for systematically understan-ding the differential segmental activity mechanism of the Qianbei fault zone and the practice of oil and gas exploration.
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