扬子地块东南缘大地构造演化及其油气地质意义  

The tectonic evolution and its oil and gas prospect of southeast margin of Yangtze Block

作　　者：王剑[1] 段太忠[1] 谢渊[1] 汪正江[1] 郝明[1] 刘伟[1] 

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081

出　　处：《地质通报》2012年第11期1739-1749,共11页Geological Bulletin of China

基　　金：国家自然科学基金项目<华南新元古代"楔状地层"沉积序列及其大地构造属性研究>(批准号:41030315);<黔东新元古代中期沉积盆地演化与地层划分对比研究>(批准号:41072088);中国地质调查局项目<中上扬子海相含油气盆地分析与油气成藏条件综合调查评价>(编号:1212010782003);<扬子东南缘Rodinia超大陆解体及沉积-成矿响应综合研究>(编号:1212011121111)

摘　　要：华南扬子地块东南缘成冰纪至早古生代可划分为3个大地构造演化阶段:南华裂谷阶段(820～635 Ma),在扬子地块东南缘的主裂谷系中,沉积了一套冲洪积相碎屑岩、陆相火山岩、深水重力流及冰碛岩等火山-碎屑岩组合;被动大陆边缘演化阶段(Nh—Camb,635～488Ma),扬子地块东南缘发育了一套最大厚度超过3000m的以碳酸盐岩沉积为主的超层序;前陆盆地演化与造山阶段(O—S,488～420Ma),发育了另一个套超层序,下部以碳酸盐岩沉积为主,上部以陆相碎屑岩为主。在盆地演化过程中,扬子地块东南缘不仅沉积了3套重要烃源岩:陡山沱组富有机质的泥质碳酸盐岩和黑色页岩、牛蹄塘组黑色页岩、五峰组—龙马溪组黑色岩系,也发育了各种优质的储集层。而位于雪峰山西侧褶皱带之内的湘、鄂、黔、渝及川相邻区,油气地质条件优越,是下古生界油气(含页岩气)勘探的有利地区。From Cryogenian to Early Paleozoic, the southeastern margin of Yangtze Block had gone through three stages： （1）Nanhua rift stage （820--635Ma）, an association of alluvial, fluvial, volcanic, deep turbidity current and glacial deposition developed in the main rifts. （2）Passive margin stage （Nh-Cambrian,635-488Ma）, a super-sequence, which was mainly composed of carbonate, and more than 3000m in thickness, formed in southeast margin basin. （3）Foreland basin evolution and Caledonian orogenic process, another super-se- quence was developed, its lower part was composed of carbonate, but the upper mainly be dominated by terrigenous deposits. During the basin evolution, the southeast margin of Yangtze Block not only modified three sources rock suites, but also developed all kinds of reservoir. The west region of Xuefeng Mountain located in the neighboring area of Hunan, Hubei, Chongqing and Sichuan, therefore, hadgood condition of marine oil and gas, and would be a favorable region for the exploration ofoil and gas（including shale gas） .

关 键 词：扬子地块 构造演化 南华裂谷 被动大陆边缘 油气资源前景 

分 类 号：P618.130.2[天文地球—矿床学]