渤海湾盆地埕北断阶带断裂发育特征及其控藏作用  

Fault development characteristics and reservoir control in Chengbei fault step zone,Bohai Bay Basin

作　　者：缪欢 王延斌[1] 何川[2] 李建红 张伟[2] 张雨建 龚训 MIAO Huan;WANG Yanbin;HE Chuan;LI Jianhong;ZHANG Wei;ZHANG Yujian;GONG Xun(School of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Research Institute of Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国石油大港油田分公司勘探开发研究院,天津300280

出　　处：《岩性油气藏》2022年第2期105-115,共11页Lithologic Reservoirs

基　　金：国家科技重大专项“深部煤储层精细描述及甜点区预测”(编号:2016ZX05066001-002)和“低效井区低产主控因素分析”(编号:2017ZX05064003-001)联合资助。

摘　　要：为研究渤海湾盆地埕北断阶带主干断层的发育特征及其与上古生界烃源岩二次生烃成藏的关系,开展了地震资料解释、钻井资料分析和各时代底面构造特征研究,精细刻画了区内张北、张东、赵北和羊二庄4条主干断层几何形态、活动性和封堵性特征。结果表明:①研究区主干断层断面呈铲式或坡坪式,与两侧的次级断裂在剖面呈“Y”字型、花状等构造样式,在平面上呈羽状、雁列状;各主干断层在Es期内的活动性最强,Ng期最弱;张东断层和赵北断层在Ed期的封堵性较差,Ng期封堵性好;张北断层在Ed期的封堵性好,Ng期的封堵性较差;羊二庄断层在Ed期和Nm期的封堵性均为较好;②歧口主凹上古生界烃源岩在Es3期内达到生烃高峰期,现今为过成熟阶段;埕北断阶带上古生界烃源岩在新近系达到生烃高峰,且现今仍处于生烃高峰期;③Ed期至现今,埕北断阶带内各成藏要素比配极好,为上古生界油气藏形成的关键时期,上古生界原生油气藏主要为自生自储的背斜油气藏、断块-断鼻油气藏和新生古储的古潜山油气藏,其中背斜油气藏和断块—断鼻油气藏在全区均有分布,而古潜山油气藏分布于张东潜山。该研究成果可为埕北断阶带上古生界油气勘探提供依据。In order to study the development characteristics of the main faults in Chengbei fault step zone of Bohai Bay Basin and its relationship with the secondary hydrocarbon generation and accumulation of Upper Paleozoic source rocks,seismic data interpretation,drilling data analysis and bottom structural characteristics of each era were carried out,and the geometric shape,activity and sealing characteristics of four main faults in Zhangbei,Zhangdong,Zhaobei and Yang’erzhuang were characterized.The results show that:(1)The main fault section in the study area is shovel type or slope flat type,and the secondary faults on both sides are in“Y”shape and flower shape in the section,and in feather and en echelon shape in horizontal plane.The activity of each main fault is the strongest in Es stage and the weakest in Ng stage.The sealing properties of Zhangdong fault and Zhaobei fault were poor in Ed stage but good in Ng stage,the sealing properties of Zhangbei fault were good in Ed stage but poor in Ng stage,and the sealing properties of Yang’erzhuang fault were good in both Ed stage and Nm stage.(2)The Upper Paleozoic source rocks in Qikou main depression reached the peak of hydrocarbon generation in Es3 stage,and now it is an over mature stage.The Upper Paleozoic source rocks in Chengbei fault step zone reached the peak of hydrocarbon generation in Neogene,and now are still in the peak of hydrocarbon generation.(3)The reservoir accumulation elements in Chengbei fault step zone are well matched from Ed stage to present which are the key stage for the formation of Upper Paleozoic reservoirs.The primary reservoirs of Upper Paleozoic are mainly self-source and self-reservoir anticline reservoirs,fault block and fault nose reservoirs,and buried hill reservoirs with young source in old reservoir,among which the former two are distributed in the whole area,and the last are distributed in Zhangdong buried hill.The research results can provide a basis for Upper Paleozoic oil and gas exploration in Chengbei fault step zone.

关 键 词：主干断层 二次生烃 油气成藏 上古生界 埕北断阶带 渤海湾盆地 

分 类 号：TE122[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]