摘要
汉留1号断层是苏北盆地高邮凹陷深凹带北侧边界断层。为了明确该断层输导通道的时间与空间分布特征,通过断层面几何形态、关键时期断层活动速率计算,阐释了汉留1号断层在两个油气主运移时期的输导能力,判识了输导通道的空间位置。研究表明,汉留1号断层在三垛组沉积期活动速率>25 m/Ma,断层开启具有输导能力,另一方面,汉留1号断层的断层面存在3个明显的凸面和2个凹面区域,因此,在该沉积期该断层在3个凸面区域发育3条输导通道。而在随后的盐城组至今的沉积期,断层活动强度减弱,活动速率<10 m/Ma,输导能力弱,垂向上主要起封闭作用。因此,空间上断层通道发育于断层面凸面位置;时间上,断层活动速率>25 m/Ma时通道开启,<10 m/Ma时通道关闭。就聚集而言,断层通道开启时油气沿断层向上运移聚集于上部滚动背斜圈闭中,闭合时聚集于下部断层圈闭中。
The Hanliu-1 fault is located on the northern border of deeply subsided area in Gaoyou sag,Subei Basin.In order to distinguish the temporal-spatial distribution of the fault conduit,fault activity rate(FAR),fault-plane geometry of the Hanliu-1 fault have been carried out for the two crucial periods of hydrocarbon migration.It is indicated that the Hanliu-1 fault was intensively active with FAR>25 m/Ma and its fault-plane geometry was featured with three obvious convex and two concave fault components during the deposition of the Sanduo Formation.Therefore,the Hanliu-1 fault was opening and three conduits occurred along the three convex fault components during this period.Since the deposition of the Yancheng Formation,the fault activity has decreased in FAR<10 m/Ma and the fault conduits have been getting closing.In conclusion,spatially,the fault conduit often occurs along convex fault component,and temporally,the fault conduit was opening as FAR>25 m/Ma and closing as FAR<10 m/Ma.As to hydrocarbon accumulation in Gaoyou sag,when the fault conduit was opening,oil migrated upwards to fill the roll-over anticline trap,and when closing,oil expelled from source rock charged immediately into the fault trap without vertical migration along the fault.
作者
陈星岳
李鹤永
孙思敏
操义军
徐哲航
邹华耀
CHEN Xingyue;LI Heyong;SUN Simin;CAO Yijun;XU Zhehang;ZOU Huayao(College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Exploration and Development Research Institute of Jiangsu Oilfield Company,SINOPEC,Yangzhou,Jiangsu 225009,China)
出处
《现代地质》
CAS
CSCD
北大核心
2022年第6期1574-1584,共11页
Geoscience
基金
国家科技重大专项(2016ZX05024-003-008)。
