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Structural Characteristics and their Significance for Hydrocarbon Accumulation in the northern slope of the Central Sichuan paleo-uplift

引用

Acta Geologica Sinica(English Edition) 2022年第4期96卷 1451-1470页

作者： TIAN Xingwang LIU Guangdi LUO Bing YANG Yu WEN Long ZHANG Benjian CHEN Xiao SU Guiping SONG Zezhang PENG Hanlin ZHOU Gang YAN Wei YANG Dailin WANG Yunlong SUN Yiting DOU Shuang State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China College of Geosciences China University of PetroleumBeijing 102249China Research Institute of Exploration and Development Southwest Oil and Gas Field CompanyPetroChinaChengdu 610041China

Based on 2D and 3D seismic data,the latest drilling data and field outcrop data of the northern slope of the Central Sichuan paleo-uplift,the structural analysis method is used to analyze unconformity development characteristics and fault characteristics during the key structural transformation period,discussing the influence of the structural characteristics on the hydrocarbon accumulation of deep carbonate *** results show that:(1)The two key unconformities of the Tongwan and Caledonian periods were primarily developed in deep carbonate ***,Tongwan’s unconformities are characterized by regional disconformities between the second and third members of the Dengying Formation,the top formation of the Sinian and the lower Cambrian,strips of which zigzag through the north and south sides of the study ***,the Caledonian unconformity is characterized by a regional unconformable contact between the lower Permian and the ower paleozoic *** NE to SW,the age of the strata,which were subject to erosion,changes from new to old,the denudation distribution showing as a nose-shaped structure which inclines towards the ENE.(2)Boundary fault and transtensional strike-slip faults developed in the Sinian to paleozoic *** profile,there are three types of structural styles:steep and erect,flower structures,’Y’and reversed’Y’type *** plane view,the Sinian developed extensional boundary faults extending in an almost NS direction,strike-slip faults developing and extending linearly in approximately EW,WNW and NE strikes in the Cambrian,with characteristically more in the south and less in the north.(3)The faults in the northern slope show obvious zonal deformations in transverse view as well as significant stages and stratified activity in a longitudinal *** them,the activity of faults in the Sinian was the strongest,followed by the activity in the Cambrian period,the activity intensity of faults in the Permian period being the weak

关键词： northern slope of paleo-uplift unconformity structural characteristics hydrocarbon accumulation Central Sichuan paleo-uplift Sichuan Basin

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