东海陆架盆地瓯江凹陷构造单元属性讨论  

Discussion on the tectonic attributes of Oujiang Sag, East China Sea Shelf Basin

作　　者：龚建明[1,2] 孙晶 廖晶[1,2] 杨长清 李智高[3] 王建强 杨艳秋[1,2] 杨传胜 李刚 孟明[4] GONG Jianming;SUN Jing;LIAO Jing;YANG Changqing;LI Zhigao;WANG Jianqiang;YANG Yanqiu;YANG Chuansheng;LI Gang;MENG Ming(Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology,Qingdao 266071,China;Shenzhen Company,CNOOC China Ltd.Shenzhen 518000,China;China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质调查局青岛海洋地质研究所,青岛266071 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266071 [3]中海石油(中国)有限公司深圳分公司,深圳518000 [4]中国地质大学,北京100083

出　　处：《海洋地质与第四纪地质》2019年第6期62-71,共10页Marine Geology & Quaternary Geology

基　　金：中国地质调查项目(DD20190211);中国地质调查项目“东海陆架盆地西部坳陷带含油气远景调查评价”(1212010310403);国家自然科学基金项目“东海陆架盆地南部与毗邻陆域中生代耦合过程研究”(41476053)

摘　　要：为了明确东海陆架盆地西部瓯江凹陷的构造单元属性,指导下步油气勘探部署,本文在前人中生代构造单元划分和构造演化的研究基础上,开展了地震剖面解释、平衡剖面分析、海陆对比研究等工作。综合研究认为,瓯江凹陷为白垩纪断陷红盆,缺少侏罗纪地层,其断裂构造特征、白垩纪沉积建造和火山岩活动等类似于浙闽隆起带,而瓯江凹陷以东的闽江凹陷为白垩纪和侏罗纪的断坳转换盆地,沉积环境为海陆过渡相-海相。地震剖面上闽江凹陷与其东侧的基隆凹陷构成一个向东倾斜的整体。海陆对比显示,瓯江凹陷与浙闽隆起侏罗纪时均处于隆升剥蚀,白垩纪时均处于断裂拉张。因此,推测瓯江凹陷与浙闽隆起带具有相似的构造单元属性,属于浙闽隆起带的一部分,其中生代的油气资源潜力可能比闽江凹陷差。In order to make clear the tectonic attributes of the Oujiang Sag in the western part of the East China Sea Shelf Basin so as to guide and arrange the next cycle of oil and gas exploration in the region, on the basis of previously studies on the Mesozoic tectonic division and evolution, seismic profile interpretation, balanced profile analysis and land-sea correlation research are conducted in this paper. Comprehensive study shows that the Oujiang Sag is a faulted Cretaceous red basin in which the Jurassic is missing. The structural characteristics of faults, the Cretaceous sedimentary sequences and magmatic activities in the sag are similar to those observed in the Zhejiang-Fujian uplift belt. The Minjiang Sag to the east of Oujiang Sag is a Cretaceous and Jurassic fault-depression and transformation basin filled with marine-terrestrial transitional facies and marine facies deposits. On the seismic profile, the Minjiang Sag and the Jilong Sag in the east constitute an entirety inclined eastward. Sea-land correlation shows that both the Oujiang Sag and the Zhejiang-Fujian Uplift belt were uplifted and denuded in Jurassic, and suffered from faulting and extension in Cretaceous. Therefore, it is inferred that the Oujiang Sag has similar tectonic attributes with the Zhejiang-Fujian uplift belt, and could be regarded as a part of the Zhejiang-Fujian uplift belt, in which the Mesozoic oil and gas resources potential is worse than that in the Minjiang Sag.

关 键 词：东海陆架盆地 浙闽隆起 瓯江凹陷 闽江凹陷 构造单元属性 

分 类 号：P544[天文地球—构造地质学]