辽东湾坳陷新生代走滑断裂体系及其成因  

CENOZOIC STRIKE-SLIP FAULT SYSTEM AND ITS GENERATING MECHANISM FOR LIAODONG BAY DEPRESSION

作　　者：何京 吴奎 张江涛 彭靖淞 HE Jing;WU Kui;ZHANG Jiangtao;PENG Jingsong(Tianjin Branch of CNOOC China Limited, Tianjin 300459, Chin)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《大庆石油地质与开发》2018年第2期40-47,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金："十二五"国家重大科技专项"近海大中型油气田形成条件与分布"(2011ZX05023-006)

摘　　要：渤海湾盆地为典型的陆相断陷盆地,其发育演化受控于郯庐走滑断裂带。基于最新的三维连片地震精细解释,运用沙箱构造物理模拟实验,分析了辽东湾坳陷新生代断裂体系特征及其成因机制。结果表明:辽东湾坳陷发育7条主干断裂,形成凹凸相间的构造格局;走滑断裂的走滑量与派生拉张断裂水平伸展量之比约为3∶2;辽东地区的走滑量大于辽西地区,郯庐断裂东盘是走滑活动的主动盘;辽西南凸起和辽西凸起在新生代早期已经形成凸起雏形,辽东凸起形成时间较晚,受强烈走滑压扭作用影响,沙三段—沙一段沉积时期才逐渐与胶辽隆起剥离;渐新世郯庐断裂带的强烈活动,控制了辽东湾的盆岭再造过程。Bohai Bay Basin is a typical continental fault-depression basin,which development and evolution are controlled by Tanlu Strike-slip Fault Belt.Based on the latest block-jointed 3 D fine seismic interpretation,with the help of the physical modeling experiment of the sand-box structure,Cenozoic fault-system characteristics and its generating mechanism of Liaodong Bay Depression were analyzed.The results show that there are 7 main faults developed in the depression,which are characterized by the structural framework of the alternate basin and range coupling;the ratio of the fault strike-slip quantity and the horizontal spread displacement of the derived extensional faults is about 3∶ 2;the quantity in Liaodong area is bigger than that in Liaoxi region,the upfaulted block of Tanlu Fault is the active plat of the strike-slip activities;Liaoxi＇nan Uplift and Liaoxi Uplift were formed earlier at the early period of Caenozoic era,corresponding Liaodong Uplift formed later,strongly influenced by the strike-slip and compresso-shear actions,in Es3-Es1 sedimentary period,the uplifts gradually stripped from Jiaoliao Uplift;In early Oligocene epoch,Tanlu Fault activities were rather strong and controlled the reconstructed process of the basins and ranges in Liaodong Bay.

关 键 词：辽东湾坳陷 新生代 郯庐断裂 走滑量 差异构造演化 辽东凸起 物理模拟 

分 类 号：TE121.2[石油与天然气工程—油气勘探]