渤海428构造带前新生代构造特征及其演化  

Pre-Cenozoic tectonic characteristics and evolution in 428 structural belt, Bohai sea

作　　者：张新涛[1] 杨帆 余一欣[2,3] 柳永军[4] 陈宇航 张震[4] 祁鹏 牛月萌 ZHANG Xintao;YANG Fan;YU Yixin;LIU Yongjun;CHEN Yuhang;ZHANG Zhen;QI Peng;NIU Yuemeng(Development and Prudution Department of CN0OC Ltd.,Beijing 10010,China;Suate Key Laborutory of Petruleam Revuraes and Prospeting,China Uriveraity of Petroleum,Beijing,Bejing 10249,China;Collegeof Geosiene,China Unirersity of Petroleum,Beijing,Beijing 102249,China;CNOOC China Limited,Tianjin Branch,Tianjin 300459,Chima;CN00C Resnarch Institute Ltd.,Beijing 100028,China)

机构地区：[1]中国海洋石油有限公司勘探开发部,北京100010 [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]中国石油大学(北京)地球科学学院,北京102249 [4]中海石油(中国)有限公司天津分公司,天津300459 [5]中海油研究总院有限责任公司,北京100028

出　　处：《中国海上油气》2023年第1期27-39,共13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428构造带位于石臼坨凸起东倾没端,是渤海有利的潜山勘探地区。428构造带前新生代经历了复杂的构造演化过程,断裂和地层发育复杂。利用三维地震资料,结合钻井资料进行精细解释,建立428构造带前新生代构造-地层格架,并对构造带东、西部断裂发育特征、地层分布以及构造演化过程进行分析。研究表明:(1)428构造带下古生界东薄西厚;上古生界仅在构造带东部发育,西部缺失;中生界全区广泛发育,仅在428构造带东局部区域缺失。该区前新生界发育具有明显的“跷跷板”式特征。(2)428构造带主要发育伸展-改造型断裂、逆冲-改造型断裂和伸展断裂,在剖面上多表现为地垒式、地堑式、多米诺式、似花状构造、Y字和反Y字形构造等组合样式。断裂活动时期可分为中期活动、晚期活动和长期活动3种。(3)428构造带构造演化过程可分为加里东—海西期差异隆升、印支期挤压逆冲、燕山期挤压—伸展—再挤压以及喜山期伸展—走滑叠加等演化阶段。基底断裂的继承性活动、应力场方向以及应力性质转变是导致428构造带前新生代“跷跷板”式构造演化的原因。The 428 structural belt of Bohai sea is the eastern pitching end of the Shijiutuo uplift, and is also a favorable area for buried-hill exploration in Bohai sea. The 428 structural belt experienced complex pre-Cenozoic tectonic evolution, and complicated faults and strata systems are developed. On the basis of borehole and 3D seismic data, the pre-Cenozoic tectonic-stratigraphic framework of the 428 structural belt is established in this paper, and the east and west fault features, strata distribution and tectonic evolution of the belt are analyzed. The results show that:(1)the Lower Paleozoic in the 428 structural belt is thin in the east and thick in the west. The Upper Paleozoic is only developed in the eastern part of the structural belt. The Mesozoic is widely developed in the whole area, except in the eastern part of the 428 structural belt. The development of pre-Cenozoic in this area has obvious “seesaw” characteristics.(2)Extension-reformed faults, thrust-reformed faults and extensional faults are predominant in the 428 structural belt. The combination types of faults involve horst, graben, domino, flower, “Y” and anti-“Y” types in section. According to fault activity, the faults can be divided into three types, namely medium-term active faults, lately active faults and long-term active faults.(3)The evolution of the 428 structural belt involves the Caledonian-Hercynian differential uplifting period, Indosinian compressional and thrusting period, Yanshanian compressional-extensional-recompressional period, and Himalayan extensional and strike-slipping period. The 428 structural belt has experienced a “seesaw” tectonic evolution process during the pre-Cenozoic period, which may result from the inherited activity of basement faults, the direction transfer of stress fields and the transfer of stress properties.

关 键 词：渤海 428构造带 前新生代 断裂 构造特征 构造演化 

分 类 号：TE121.2[石油与天然气工程—油气勘探]