四川盆地中二叠统构造-沉积分异与油气勘探  

Sedimentary topography and tectonic differentiation on the Middle Permian platform and hydrocarbon exploration in Sichuan Basin,SW China

作　　者：刘树根[1,2] 文龙 宋金民[1] 孙玮[1] 汪华[3] 金鑫 郭海洋[4] 邓宾 江青春[5] 李智武[1] 丁一[1] 叶玥豪[1] 王瀚[1] 范建平[1] 杨迪 李柯然[1] 田小彬 罗平[1,5] LIU Shugen;WEN Long;SONG Jinmin;SUN Wei;WANG Hua;JIN Xin;GUO Haiyang;DENG Bin;JIANG Qingchun;LI Zhiwu;DING Yi;YE Yuehao;WANG Han;FAN Jianping;YANG Di;LI Keran;TIAN Xiaobin;LUO Ping(State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu University of Technology,Chengdu 610059,China;Xihua University,Chengdu 610039,China;Research Institute of Petroleum Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China;Southwest Geophysical Research Institute of BGP,CNPC,Chengdu 610093,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Exploration and Development Research Institute of Daqing Oilfield Company,PetroChina,Daqing 163712,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]西华大学,成都610039 [3]中国石油西南油气田分公司勘探开发研究院,成都610041 [4]中国石油集团东方地球物理勘探有限责任公司西南物探研究院,成都610093 [5]中国石油勘探开发研究院,北京100083 [6]大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《成都理工大学学报（自然科学版）》2022年第4期385-413,共29页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金企业创新发展联合基金(U19B6003);国家自然科学基金面上项目(41872150)。

摘　　要：受峨眉地裂运动的影响,四川盆地中二叠统发生了较强的构造-沉积分异,形成了“两台一凹”的构造-沉积格局。通过含海泡石(滑石)层系厚度、连井剖面和地震响应特征刻画四川盆地中二叠统的构造-沉积分异,并探讨其油气勘探意义。研究结果表明,自中二叠世栖霞期始,四川盆地就已经开启了北西-南东向的构造-沉积分异。栖一期,通江-苍溪-南充-长寿凹陷(简称通江-长寿凹陷)初步形成,“两台一凹”的构造-沉积格局基本定型;蜀南台地含海泡石(滑石)层系分布面积为9.69×10^(4)km^(2),含海泡石(滑石)层系厚度为0~9.1 m;川东北台地含海泡石(滑石)层系分布面积为3.77×10^(4)km^(2),含海泡石(滑石)层系厚度为0~13 m;通江-长寿凹陷主要呈“C”形的北宽中窄南宽的双喇叭形特征,含海泡石(滑石)层系分布面积为3.75×10^(4)km^(2),厚度为10.3~28.4 m。栖二期,通江-长寿凹陷内外含海泡石(滑石)层系厚度差异不明显,但含海泡石(滑石)层系展布依然为北西-南东向。茅一期,通江-长寿凹陷向南扩展,延续了栖霞期向台内延伸的趋势;蜀南台地向北西扩大,形成川西北-蜀南台地,含海泡石(滑石)层系分布面积为7.79×10^(4)km^(2),含海泡石(滑石)层系厚度为0~45.6 m;川东北台地含海泡石(滑石)层系分布面积为3.94×10^(4)km^(2),含海泡石(滑石)层系厚度为0~53 m;通江-长寿凹陷依然为“C”形的北窄南宽的喇叭形特征,面积为5.79×10^(4)km^(2),含海泡石(滑石)层系厚度为36.3~96.0 m。茅二期,通江-长寿凹陷的“C”形态消失,为北西-南东走向的苍溪-渠县凹陷所取代,但“两台一凹”的构造-沉积格局仍然存在,该凹陷西陡东缓,面积为1.4×10^(4)km^(2),含海泡石(滑石)层系厚度为36.3~53.6 m。中二叠世通江-长寿(生烃)凹陷的发现提升了油气勘探的潜力,凹陷“C”形区带内及周缘地区是中二叠统油气勘探的最有利地区。根据�The topography pattern of“two highs and one low”has been produced in the upper Yangtze craton due to the tectonic differentiation related to middle Permian Emei Taphrogenesis.The tectono-topography pattern and its hydrocarbon significances have been discussed based on the data of sepiolite(talcum)-bearing strata thickness,well-log section correlation and seismic reflection characteristic.The tectono-topography pattern in NW to SE direction has emerged since middle Permian Qixia period in Sichuan Basin(an epeiric platform).In Stage Luodian(Qi-1),Tongjiang-Cangxi-Nanchong-Changshou Sag(hereinafter referred to as Tongjiang-Changshou Sag)takes place initially and a pattern of“two highs and one low”in the epeiric-sea carbonate platform is formed.The area of sepiolite(talcum)-bearing strata in Southern High is 9.69×10^(4)km^(2),with a thickness of 0~9.125 m,while in Northeast High it is 3.77×10^(4)km^(2) and 0~13 m thick.However,the area of sepiolite(talcum)-bearing strata in Tongjiang-Changshou sag is 3.75×10^(4)km^(2),with total thickness of 10.25~28.36 m.In Stage Panxiang(Qi-2),the thickness is nearly same in or out of the Tongjiang-Changshou Sag but the distributive direction of sepiolite(talcum)-bearing deposits keeps in NW to SE.In Stage Roadian(Mao-1),the sag extends southward.The Southern Sichuan connecting Northwest Sichuan form a new High having an area of sepiolite(talcum)-bearing beds up to 7.79×10^(4)km^(2) and 0~45.625 m in thickness.And the sepiolite(talcum)-bearing strata in Northeast High is 0~53 m thick and 3.94×10^(4)km^(2)in area.The north narrow and south wide Tongjiang-Changshou sag with a shape of“C”-like is much larger then,covering an area of 5.79×10^(4)km^(2) and thickness of 36.25~95.95 m in sepiolite(talcum)-bearing strata.In Stage Wordian(Mao-2),the Tongjiang-Changshou Sag moves into Cangxi-Quxian Sag in NW to SE direction and maintains the“two highs and one low”pattern.The Cangxi-Quxian Sag covers an area of 1.4×10^(4)km^(2) and holds sepiolite(talcum)-bearing strata

关 键 词：四川盆地 中二叠统 通江-长寿凹陷 构造-沉积分异 油气勘探 

分 类 号：TE122.1[石油与天然气工程—油气勘探]