Tectonic characteristics and hydrocarbon accumulation in the Block T,Indus River Basin
Chen Xu1,2,3, Liu Caiqin2, Wang Hongmei2, Xie Ruijie1,3, Yang Jianfang2, Dong Xiyan2
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China; 2. GRI, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China; 3. Institute of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China
Abstract：Based on a large number of seismic interpretation and geological comprehensive analysis,the regional tectonic evolution characteristics in the Block T,Indus River Basin are discussed in this paper; the transtensional fault combination styles and favorable trap types are summarized; and the relationship between tectonic activities and hydrocarbon accumulation is further analyzed.The cognitions are as follows:①The tectonic evolution has mainly experienced four stages:basement,Jurassic rift,Cretaceous diagonal extension-depression and plate collision,and tectonic reverse since Paleogene.Multi-stages of tectonic movements resulted in well-deve-loped fault systems and broken structures in the study area; ②India Plate drift,rotation,and splitting caused diagonal extension-depression in the study area,which helped to form horst-graben structures and locally complex fault blocks,and tectonic patterns were basically formed in late Cretaceous.Combined with the analysis of transtensional faults combination characteristics,6 kinds of plane and 7 kinds of vertical types of combinations are identified; ③The Block T has favorable hydrocarbon accumulation conditions,tectonic activities promote the maturity and hydrocarbon expulsion from source rocks,and different transtensional structure combinations formed various hydrocarbon trap type,including faulted blocks,faulted noses,faulted anticline and structure-lithology compo-site traps.Major huge faults provided the hydrocarbon migration channel by connecting oil sources and traps.It shows that there is a good spatial and temporal relationship among transtensional fault activities,hydrocarbon expulsion,and trap forming period.At last, based on the structure characteristics and hydrocarbon accumulation analysis,the paper discusses favorable hydrocarbon exploration zones.
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