河套盆地临河坳陷及其周边地区中-新生代成盆演化特征  

Evolutionary characteristics of Linhe Depression and its surrounding areas in Hetao Basin from the Mesozoic to Cenozoic

作　　者：张锐锋 于福生[2] 刘喜恒 刘静 陈树光 吴晨林 王逸群 王盛亮 Zhang Ruifeng;Yu Fusheng;Liu Xiheng;Liu Jing;Chen Shuguang;Wu Chenlin;Wang Yiqun;Wang Shengliang(Exploration Department of Huabei Oilfield Company,PetroChina,Renqiu,Hebei 062550,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Exploration and Development Research Institute of Huabei Oilfield Company,PetroChina,Renqiu,Hebei 062550,China;Bayan Branch of Huabei Oilfield Company,PetroChina,Bayan Nur,Inner Mongolia Autonomous Region 015000,China)

机构地区：[1]中国石油华北油田公司勘探事业部,河北任丘062550 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油华北油田公司勘探开发研究院,河北任丘062550 [4]中国石油华北油田巴彦勘探开发分公司,内蒙古巴彦淖尔015000

出　　处：《石油与天然气地质》2020年第6期1139-1150,共12页Oil & Gas Geology

基　　金：中国石油天然气股份有限公司科技攻关项目(2019D-0815);国家自然科学基金面上项目(42072144)。

摘　　要：河套盆地经历40余年勘探,近期获得重大突破,吉华2X井和松5井高产油流证明临河坳陷内中-新生代层系具有较大的勘探潜力,因此开展中-新生代盆地构造演化研究,对分析沉积充填过程与圈闭形成条件具有借鉴意义。通过野外露头调查、岩心观察、地球物理资料解释及构造演化阶段分析等综合研究认为:临河坳陷及周边地区中-新生代发育挤压、伸展、走滑和反转等多种构造变形样式,经历了挤压拗陷(早白垩世李三沟组沉积期)、拗-断转换(早白垩世固阳组沉积期)、隆升剥蚀(晚白垩世—古新世)、弱断陷(始新世—渐新世)、强烈断陷(中新世—上新世)和走滑改造(更新世—全新世)等多期构造演化阶段,盆地类型属于多旋回叠合盆地。建立了早期差异挤压、晚期差异伸展叠加盆地成因模型。A major breakthrough,marked by two high-yield wells(Jihua 2 X and Song 5),has been made recently in the Linhe Depression of the Hetao Basin after more than 40 years of exploration,thus revealing the great hydrocarbon potential of its Mesozoic-to-Cenozoic strata.A study on the tectonic evolution of the basin from the Mesozoic to Cenozoic may be of great contribution to the analysis of the deposition process and conditions for forming oil/gas traps.As a result,an integrated analysis of field outcrops,cores,geophysical data,and structural evolution of the basin was carried out and shows that a variety of structural deformation patterns are developed in the Linhe Depression and its surrounding areas from the Mesozoic to Cenozoic,including compression,extension,strike-slip,and inversion structures.The study area thereby experienced multiple-stage evolution from compressional depression(during the deposition of Lisangou Formation in the Early Cretaceous),depression-to-faulting conversion(during the deposition of Guyang Formation in the Early Cretaceous),uplifting and denudation(during the Late Cretaceous to Palaeocene),to weakly rifted depression(during the Eocene to Oligocene),strongly faulted depression(during the Miocene to Pliocene),and strike-slip transformation(during the Pleistocene to Holocene).The basin belongs to the multi-cycle superimposed type.And a genetic basin model was established to incorporate an early differential compression and a superimposition with late differential extension.

关 键 词：反转构造 构造演化 中-新生代 临河坳陷 叠加盆地 河套盆地 

分 类 号：TE121.2[石油与天然气工程—油气勘探]