济阳坳陷埕岛东部地区断层特征及其与新近系油气富集关系  

Fault characteristics and their relationships with hydrocarbon accumulation in Neogene in eastern Chengdao area,Jiyang Depression

作　　者：张学才[1] 刘华[2] 张芷晴 杨贵丽[3] 徐昊清[3] 赵珊 ZHANG Xuecai;LIU Hua;ZHANG Zhiqing;YANG Guili;XU Haoqing;ZHAO Shan(Oil and Gas Exploration Management Center,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257000,China;School of Geosciences,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)

机构地区：[1]中国石化胜利油田分公司油气勘探管理中心,山东东营257000 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《油气地质与采收率》2022年第3期1-10,共10页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“济阳坳陷油气富集机制与增储领域”(2016ZX05006-003);国家自然科学基金创新研究群体“油气成藏机理”(41821002)。

摘　　要：为了揭示济阳坳陷埕岛东部地区断层特征对新近系油气富集差异性的控制作用,以断层类型和断层活动性分析为基础,利用三维地震数据及钻井、测井资料,使用断层活动速率法,重点分析油气成藏期断层活动特征及其与新近系油气富集的关系。研究结果表明,埕岛东部地区发育油源Ⅰ型断层、油源Ⅱ型断层和调节断层共3种类型断层;油气主成藏期(明化镇组沉积时期)3种类型断层的活动性存在较大差异,油源Ⅰ型断层活动速率多大于15 m/Ma,油源Ⅱ型断层活动速率为10~15 m/Ma,调节断层活动速率多小于10 m/Ma。研究区油源断层控制了新近系油气的富集程度和空间分布差异,桩海断裂带发育较多活动速率大于10 m/Ma的油源Ⅰ型和Ⅱ型断层,且断-盖配置有利,为典型的断层输导-垂向运移模式,新近系油气富集程度高;而埕岛东部斜坡带油源断层分布少,断层活动性较弱,断层活动速率为10~12 m/Ma,为断层-砂体输导-阶梯式运移模式,新近系油气富集程度低,油气多分布于新近系下伏储层。Fault types and activities were analyzed to reveal the control of fault characteristics on differences of oil and gas enrichment in the Neogene in the eastern Chengdao area,Jiyang Depression.On this basis,3D seismic data,as well as log⁃ging and drilling data,were utilized to study the fault activities during hydrocarbon accumulation and their relationships with the Neogene oil and gas enrichment in terms of the fault activity rate.Studies have shown that three types of faults are in the eastern Chengdao area,i.e.oil source typeⅠ,oil source typeⅡ,and adjustment faults.There are obvious differences in the activities of the three types of faults during the main accumulation period(Minghuazhen period):the activity rates of most oil source typeⅠfaults,oil source typeⅡfaults and most adjustment faults are more than 15 m/Ma,10-15 m/Ma and less than 10 m/Ma respectively.The oil source faults in the study area control the differences in enrichment and spatial dis⁃tribution of oil and gas in the Neogene.Zhuanghai fault zone has developed many oil source typeⅠand typeⅡfaults at an activity rate greater than 10 m/Ma,and the fault-caprock assemblage is favorable.A typical fault transport-vertical migra⁃tion mode can be found,and the degree of oil and gas enrichment is high in the Neogene.In addition,oil source faults are few in the east slope of Chengdao area,with weak fault activities(10-12 m/Ma),following a fault-sand body transport stepped migration mode.The degree of Neogene oil and gas enrichment is low,and they are mostly distributed in the under⁃lying reservoirs.

关 键 词：断层活动性 油源断层 油气差异富集 新近系 埕岛地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]