渤海海域东部弯曲走滑断裂派生伸展与挤压作用的定量表征及其油气地质意义  

Quantitative characterization of extension and compression derived from bending strike-slip faults and their petroleum geological significance of the eastern Bohai Sea

作　　者：李伟[1,2] 蒙美芳[1,2] 陈兴鹏 张同杰 杨海风[3] 牛成民 吴智平 冯建伟 LI Wei;MENG Meifang;CHEN Xingpeng;ZHANG Tongjie;YANG Haifeng;NIU Chengmin;WU Zhiping;FENG Jianwei(School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China;Key Laboratory of Deep Oil&Gas Geology and Geophysics in Ministry of Education(China University of Petroleum(East China)),Qingdao 266580,China;Tianjin Technical Department,CNOOC,Tianjin 300452,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]深层油气地质与地球物理教育部重点实验室(中国石油大学(华东)),山东青岛266580 [3]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《中国石油大学学报（自然科学版）》2021年第5期23-32,共10页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2016ZX05006-007)。

摘　　要：弯曲走滑断裂的局部构造应力特征复杂,影响油气的生成、运移和聚集成藏。以渤海海域东部为例,基于最新的三维地震、钻井、油气成藏等资料,建立弯曲走滑断裂派生局部伸展和挤压作用的定量表征方法,探讨走滑派生局部挤压和伸展构造的油气地质意义。结果表明:垂直于弯曲走滑断裂走向的区域走滑作用力法线方向分力为该位置派生挤压或伸展作用的强度,针对同一断裂某一区段可用走滑派生强度系数定量表征派生伸展和挤压作用的强弱,当该系数为正值时代表派生挤压作用,当该系数为负值时代表派生伸展作用,绝对值表示派生伸展或挤压作用的相对大小;走滑派生伸展作用促进洼陷的构造沉降,派生强度系数绝对值越大烃源岩厚度、总有机碳含量越大;走滑派生挤压作用导致圈闭幅度增大,增压段圈闭幅度明显大于释压段,派生强度系数越大圈闭幅度越大;走滑派生局部伸展与挤压作用的差异导致断裂及其附近孔隙度、渗透率发生变化,进而影响断裂对油气输导与封堵的控制作用,油气在增压段主要沿断裂带走向或垂向运移,释压段主要穿过断裂带横向运移、沿断裂带垂向运移,不同类型和强度派生构造对油气输导和封堵的差异性影响油气的展布规律。The complex local tectonic stress characteristics of bending strike-slip faults affect the generation,migration and accumulation of hydrocarbon.Taking the eastern part of the Bohai Sea as an example,and by using the latest 3D seismic,drilling and hydrocarbon accumulation data,we established a quantitative characterization method for local effects of extension and compression derived from bending strike-slip faults.We then discussed their geological significance in hydrocarbon generation.The results show that the normal component of the strike-slip force perpendicular to the strike-slip fault direction is the strength of the derived compression or extension at that location.For a section of the same fault,the strike-slip derived strength coefficient can be used to quantitatively characterize the derived extension and compression.When the coefficient is positive,it represents the derivative compression,while a negative coefficient represents the extension.The absolute value represents the relative magnitude of the derivative extension or compression.Strike-slip-derived extension promotes the tectonic subsidence of the depression.The greater the absolute value of the derived strength coefficient is,the greater the thickness of the source rock and the total organic carbon content become.The strike-slip-derived compression causes an increase of the amplitude of the trap,and the amplitude of the trap are obviously larger than those in the strike-slip-derived extensional area.The greater the derived strength coefficient is,the greater the amplitude and width of the trap are.The differences of the strike-slip-derived local extension and compression lead to changes in the porosity and permeability of the fault and its vicinity,which in turn affects the fault s control on oil and gas transportation and sealing.In the restraining section,the oil and gas may migrate along the strike(structural ridge)and vertical direction of the fault zone.In the releasing section,the oil and gas migrate laterally across the fault zone and v

关 键 词：弯曲走滑断裂 派生构造 定量表征 油气地质意义 渤海东部 

分 类 号：TE122.3[石油与天然气工程—油气勘探]