歧口凹陷断裂构造特征及其控油气作用  

Structural Characteristics of Fault and its Control on Oil and Gas Distribution in Qikou Sag

作　　者：魏真真[1] 王丙贤 杨静[3] WEI Zhen-zhen;WANG Bing-xian;YANG Jing(Department of Oil&Gas Engineering,Shengli Institute of China University of Petroleum,Dongying 257000,China;Petroleum Engineering Design Company,SINOPEC,Dongying,257000,China;Research Institute of Oil Production Technology,Dagang Oilfield Company,Petro China,Tianjin,300280,China)

机构地区：[1]中国石油大学胜利学院油气工程学院,东营257000 [2]中石化石油工程设计有限公司,东营257000 [3]中国石油大港油田分公司采油工艺研究院,天津300280

出　　处：《科学技术与工程》2020年第11期4288-4295,共8页Science Technology and Engineering

基　　金：国家自然科学基金(40772132);山东省高等学校科研发展计划(J18KA205);中国石油大学胜利学院春晖计划(KY2018007);中国石油大学胜利学院科研计划重点项目(KY2017010)。

摘　　要：以基础地质、地球物理资料等为基础,系统分析歧口凹陷断裂构造平面、剖面构造特征,并通过关键时期断层活动性分析、主要油源断层的厘定、断层封闭系数计算等,进一步探讨歧口凹陷构造控油气作用,对歧口凹陷断裂构造取得新的认识,明确区内断裂构造特征及其控油气作用。研究表明,歧口凹陷平面上主要发育NNE、NE、EW和近EW向4组断裂,剖面上表现出多种典型的伸展构造样式、伸展-走滑构造样式;断层的活动性具有明显的分段特征,其中,Es3时期、Es1时期和Ed时期断层活动性强,Ng时期以来断层活动性明显减弱。研究区发育7条主要油源断层, Es1-Ed时期断层封闭系数均较低,不利于油气成藏,Ng-Nm时期断层封闭系数明显优于Ed时期,以4~6为主,成为歧口凹陷油气成藏与分布的主控因素。Based on the data of geology and geophysics, the structural characteristics of faults shown in planer and sectional views in Qikou Sag, Bohai Bay Basin, North China were systematically analyzed. By analyzing fault activity in key geological periods, the main oil source faults were determined, the fault sealing coefficient was calculated, and the structural hydrocarbon control in Qikou Sag was further examined. Results show that faults were developed in mainly four directions or groups: NNE, NE, EW, and nearly EW in Qikou Sag. Meanwhile, many typical styles of extensional structure and extensional-strike-slip structure were recognized. The activity of faults showed obvious different characteristics in different geological periods. In general, the activity of faults was strong during the sedimentary period of Es1, Es3, and Ed, while it was weak since the deposition of Ng. Seven main oil source faults were developed in the study area. The sealing coefficient of faults in Es1-Ed period was low, which was not conducive to hydrocarbon accumulation. The sealing coefficient of faults in the Ng-Nm period(in range of 4-6) was obviously greater than that in Ed period, thus the Ng-Nm period was the main periods in structural control for hydrocarbon accumulation and distribution in Qikou Sag.

关 键 词：歧口凹陷 构造特征 断层活动性 构造控油 油源断层 

分 类 号：TE122[石油与天然气工程—油气勘探]