东海盆地丽水凹陷CO_(2)分布特征及成藏主控因素  

Distribution and Major Controlling Factors of CO_(2) Reservoirs in Lishui Sag,East China Sea Basin

作　　者：牛杏 何云龙 庄新国[3] Niu Xing;He Yunlong;Zhuang Xinguo(School of Geosciences,Yangtze University,Wuhan 430100,China;College of Marine Science and Technology,China University of Geosciences,Wuhan 430074,China;School of Earth Resources,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]中国地质大学海洋学院,湖北武汉430074 [3]中国地质大学资源学院,湖北武汉430074

出　　处：《地球科学》2021年第10期3549-3559,共11页Earth Science

基　　金：“十三五”国家重大科技专项(No.2016ZX05027-001-006)。

摘　　要：基于丽水凹陷钻井和地震资料,综合天然气地球化学参数、基底断裂和岩浆底辟发育特征等,研究丽水凹陷CO_(2)的分布特征及其成藏主控因素.研究结果表明,丽水凹陷CO_(2)纵向上主要分布在灵峰组、明月峰组下段及元古界基底片麻岩中,不同层位CO_(2)的含量差别很大;平面上,温州13-1、丽水35-7和南平5-2 CO_(2)气藏均位于岩浆底辟体之上或者附近,同时周围亦发育断层,而丽水36-1高含CO_(2)气藏和LF-1井含CO_(2)气藏周围底辟不发育,均紧邻灵峰凸起西侧的控洼断裂.丽水凹陷幔源CO_(2)成藏主要受早中新世和晚中新世两期火山岩浆活动的影响,这两期火山活动将幔源CO_(2)带到地壳浅层,通过砂体侧向输导进入有利圈闭聚集成藏.Based on the drilling data and seismic data of Lishui sag, the distribution and major controlling factors of CO_(2)reservoirs are studied by combining geochemical parameters of natural gas and development characteristics of basement faults and magma diapirs. The results show that CO_(2)is mainly concentrated in Lingfeng Formation, lower segment of Mingyuefeng Formation and Proterozoic basal gneiss in the vertical. Besides, the content of CO_(2)varies greatly in different layers. Laterally, Wenzhou 13-1,Lishui 35-7 and Nanping 5-2 structural CO_(2)gas reservoirs are located on or near the magma diapirs, and there are faults around these CO_(2)gas reservoirs. Whereas, there is no diapir near Lishui 36-1 structural CO_(2)gas reservoirs and LF-1 containing CO_(2)gas reservoir, but they are adjacent to large depression-controlling faults which are located at west side of Lingfeng uplift. The distribution of CO_(2)gas reservoirs in the Lishui sag is mainly controlled by two stages magmatic activities, which are respectively in Early Miocene and Late Miocene. Mantle-derived CO_(2)gas is carried by the deep volcanic magma activities to shallow crust, then migrates along with sand body to favorable traps and forms CO_(2)gas pools.

关 键 词：CO_(2)成因 时空分布 岩浆活动 控制因素 丽水凹陷 油气 

分 类 号：P62[天文地球—地质矿产勘探]