渤海辽中南洼共轭走滑格局与新生界火成岩发育特征  

Conjugated strike-slip pattern and igneous development of southern sag of Liaozhong depression in Bohai Sea

作　　者：柳屿博 郭涛 樊建华 徐坤明 王鑫 王冰洁 LIU Yubo;GUO Tao;FAN Jianhua;XU Kunming;WANG Xin;WANG Bingjie(CNOOC International Limited,Beijing 100028,China;Tianjin Branch of CNOOC Limited,Tianjin 300452,China)

机构地区：[1]中国海洋石油国际有限公司,北京100028 [2]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《石油化工应用》2022年第4期82-89,共8页Petrochemical Industry Application

基　　金：国家科技重大专项课题“中国近海富烃凹陷优选与有利勘探方向预测”,项目编号:2016ZX05024-002。

摘　　要：鉴于新钻井首次在渤海辽中南洼新生界钻遇厚层火成岩且成藏,因此深入分析该区火成岩构造成因及储层条件具有现实勘探意义。本文利用地震、钻井、壁心薄片等开展研究。分析认为辽中南洼发育两组共轭走滑断裂系统,即:(1)北东向与北西向断裂系构成的直角式共轭走滑;(2)北东向与近南北向断裂系构成的锐角式共轭走滑。其中,北西向断裂系为左旋走滑活动,属于盆地基底断裂,对辽东湾地区构造变形具有控制作用。上述两组共轭走滑断裂活动引发的块体破碎、旋转及局部反转为新生界火成岩发育提供了通道。开展火成岩岩性、岩相分析,认为目标区火成岩发育爆发相、溢流相、侵出相和火山通道相,其中,爆发相火山角砾岩层系可作为较好储集体。综合分析认为辽中南洼新生界火成岩领域具有较大勘探潜力。As new well encountered thick igneous rocks in the third member of the Shahejie formation and explained a small amount of oil layers.This is the first time that thick igneous rocks have been drilled and accumulated in the Cenozoic in the Liaodong Bay area.The genesis and reservoir conditions of the igneous rocks in this area are analyzed.Realistic prospecting significance.This paper uses data methods such as seismic,drilling,and wall-core section observation to carry out research work.In general,there are two groups of conjugate strike-slip fault systems developed in southern sag of Liaozhong depression.(1)The right-angle conjugate strike-slip formed by the northeast and northwest-trending fault systems.(2)The acute-angle conjugate formed by the northeast and nearly north-south fault systems.Among them,the NW-trending fault system is a left-handed strike-slip activity,which belongs to the basement fault of the basin,and has a controlling effect on the structural deformation of Liaodong Bay area.The development of block fragmentation,rotation,and local inversion structure triggered by the two groups of conjugate strike-slip faults activities in the northeast and northwest,as well as the northeast and near-south-trending fault systems provide channels for the development of Cenozoic igneous rocks.Analyzing the lithology and lithofacies of igneous rocks based on the wall core data,it is believed that the igneous rocks in the target area develop eruptive facies,overflow facies,intrusive facies and volcanic channel facies.Among them,the eruptive facies volcanic breccia strata can serve as better reservoirs.It is believed that the exploration of Cenozoic igneous rock in southern sag of Liaozhong depression has great exploration potential.

关 键 词：辽中南洼火成岩 共轭走滑断裂 构造火山作用 北西向走滑断裂 火成岩储层 

分 类 号：TE122.22[石油与天然气工程—油气勘探]