渤海辽西低凸起南倾没端前古近系断裂特征及对潜山地层控制作用  

Characteristics of the pre-Paleogene faults and their influences on buried-hill strata at the south pitching end of the Liaoxi low uplift,Bohai sea

作　　者：杨帆 陈宇航[3] 张新涛[4] 余一欣 柳永军[5] 张震 牛月萌 YANG Fan;CHEN Yuhang;ZHANG Xintao;YU Yixin;LIU Yongjun;ZHANG Zhen;NIU Yuemeng(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petrolewm,Beijing,Beijing 102249,China;College of Geosciences,China Unitrersity of Petroleum,Beijing,Beijing 102249,China;Research Institute of Petrolerem Exploration and Development,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China;Exploration Department of CNOOC China Limited,Beijing 100010,China;CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]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 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油长庆油田公司勘探开发研究院,陕西西安710018 [4]中海石油(中国)有限公司勘探部,北京100010 [5]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《中国海上油气》2022年第6期14-23,共10页China Offshore Oil and Gas

基　　金：中海油科技项目“中国近海潜在富油凹陷新生代构造差异研究与构造恢复(编号:CCL2021RCPS0169KQN)”部分研究成果。

摘　　要：渤海辽西低凸起南倾没端紧邻渤中凹陷和秦南凹陷,是环渤中凹陷重要的潜山勘探目标区,前古近系断裂对潜山地层的分布有重要影响。通过对三维地震资料进行精细解释,结合钻井资料和区域演化背景,对辽西低凸起南倾没端前古近系断裂发育及对潜山地层控制作用进行分析。辽西低凸起南倾没端前古近系主要发育负反转断裂、伸展-走滑复合断裂以及伸展断裂,在剖面上多组合成叠瓦式、似花状、“Y”型以及多米诺式等构造样式。平面上,前古近系断裂主要呈NW向、NE—NNE向以及NE—NEE展布。前古近系断裂主要经历了印支期、燕山期和喜山期等多期次活动,其中印支期断裂发生逆冲推覆,控制了古生界的展布,而燕山期逆冲断裂发生反转和新生成的伸展断裂共同控制了中生界的发育。喜山期在近SN向伸展应力影响下,部分燕山期断裂发生复活,形成伸展-走滑复合断裂。Adjacent to the Bozhong and Qinnan sags,the south pitching end of Liaoxi low uplift in Bohai sea is an important exploration target for buried hill around Bozhong sag.The pre-Paleogene faults have an important impact on strata distribution of buried hill.In this paper,the development of pre-Paleogene faults at the south pitching end of the Liaoxi low uplift and their control on buried hill strata are analyzed by fine interpretation of three-dimensional seismic data,combined with drilling data and regional evolution background.The results show that there are mainly negative inversion faults,extensional-strike-slip composite faults and extensional faults in the pre-Paleogene in the study area,and their composite styles involve imbricate,flower-like shape,“Y”shape and domino.On the plane,the pre-Paleogene faults are mainly distributed in NW,NE—NNE and NE—NEE directions.Pre-Paleogene faults mainly experienced different activities such as Indosinian,Yanshanian and Himalayan periods,among which Indosinian faults were thrust napped,which controlled the distribution of Paleozoic;while the inversion of Yanshanian thrust faults and the newly formed extensional faults jointly controlled the development of Mesozoic.During the Himalayan period,under the influence of tensile stress in the near SN direction,some Yanshanian faults revived and developed extensional-strike-slip composite faults.

关 键 词：渤海 辽西低凸起 前古近系 断裂 潜山 潜山地层 

分 类 号：TE121.2[石油与天然气工程—油气勘探]