东海丽水凹陷构造转移带特征及其油气地质意义  

Characteristics of transfer zones in Lishui Sag,East China Sea and its significance for petroleum geology

作　　者：刘欢 许长海[1,2] 申雯龙 邓玉玲 LIU Huan;XU Changhai;SHEN Wenlong;DENG Yuling(School of Ocean and Earth Science,Tongji University,Shanghai City,200092,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai City,200092,China;China Limited-Shanghai,CNOOC,Shanghai City,200335,China)

机构地区：[1]同济大学海洋与地球科学学院,上海200092 [2]同济大学海洋地质国家重点实验室,上海200092 [3]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《油气地质与采收率》2021年第4期12-22,共11页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目“东海陆架到南海北部晚中生代东亚汇聚边缘演变的岩浆弧记录”(41876045)。

摘　　要：在伸展断陷盆地中,不同断层之间通过构造转移带进行位移的传递,以此实现区域伸展应力的守恒。东海陆架盆地丽水凹陷构造转移带十分发育,对丽水凹陷的结构具有至关重要的影响。基于构造转移带研究现状系统调研结果,结合丽水凹陷区域构造解释成果,采用构造分析、断裂解析、断层生长过程恢复、断层位移-走向曲线等方法,对丽水凹陷构造转移带的发育位置、类型及特征进行了详细剖析,识别出中转斜坡、转移断层、调节带3种主要的构造转移带类型,认为构造转移带是造成丽水凹陷灵峰主断裂走向急剧变化以及盆地沉积中心发生跃迁的主要原因,并将丽水凹陷的西次凹划分为南、北2个构造带。进而探讨构造转移带对沉积物输入盆地的影响及其对储层的控制作用,认为丽水凹陷主要边界断层之间发育的中转斜坡是有利的油气成藏区带。In the extensional faulted basin,the displacement transfer between faults is enabled through the transfer zones to realize the conservation of regional extensional stress.The transfer zones of Lishui Sag in the East China Sea shelf basin are well developed,exerting a vital influence on the sag structure.Based on the systematic investigation into research status of transfer zones and the interpretation of regional structures in Lishui Sag,the locations,types and characteristics of the trans⁃fer zones in Lishui Sag were analyzed in detail through structural analysis,fault analysis,fault growth process recovery,fault displacement-strike curve and other methods.As a result,three main types of transfer zones were identified:relay ramps,transfer faults,and accommodation zones.It is believed that the transfer zones are the main reason for the sharp change in the strike of the main Lingfeng Fault of Lishui Sag and the transition of the sedimentary center in the basin,and the western sub-sag of Lishui Sag is divided into the north and south structural belts.Then the influence of the transfer zones on the process of sediment input into the basin and its control on the reservoir are studied.It is considered that the re⁃lay ramps between major boundary faults in Lishui Sag constitute a favorable accumulation zones.

关 键 词：构造转移带 中转斜坡 转移断层 调节带 丽水凹陷 

分 类 号：TE121.2[石油与天然气工程—油气勘探]