四川盆地寒武系—震旦系含气系统成藏特征及有利勘探区块  

Formation characteristics of natural gas reservoirs and favorable exploration areas in Sinian Cambrian petroleum system of Sichuan basin.

作　　者：戴鸿鸣[1] 王顺玉[1] 王海清[1] 黄清德[1] 

机构地区：[1]西南石油学院

出　　处：《石油勘探与开发》1999年第5期16-20,共5页Petroleum Exploration and Development

基　　金：国家"九.五"天然气攻关项目;油气藏地质及开发工程国家重点实验室

摘　　要：加里东古隆起震旦系含气层是四川盆地勘探的重要领域之一，但自发现威远大气田至今已３５ 年，尚未找到类似的第二个大气田，究其原因，除由于震旦系含气层勘探程度较低外，还由于古隆起上油气藏形成后又遭受了不同地质作用的改造。应用含油气系统理论和方法，剖析威远大气田和资阳含气地区，指出：四川盆地寒武系—震旦系含气系统具有形成大中型气田的基本要素和成藏过程；圈闭形成早晚及隆起幅度、储集层渗透性是影响油气聚集丰度的主要因素；喜山期形成的圈闭可聚集大范围内高—过成熟天然气和古隆起上“回返”的天然气，有利于形成大中型气田；古隆起上岩性圈闭可形成“残留型”气藏。认为有利勘探圈闭类型主要为威远式背斜圈闭和古岩溶形成的岩性圈闭，提出威北—资阳、高石梯—龙女寺、荣昌—大足以及川西区南部等４ 个现实的有利勘探区块。图５ 表１ 参７（That Sinian bearing gas formation in the palaeohigh formed during Caledonian orogeny is an important natural gas exploration area of Sichuan basin. Although it is over thirty years since the large Weiyuan gas field was discovered, the second similar has not been found yet, to study carefully its causes besides lower exploration level there is a very strong relation to the different geological reworking after petroleum reservoirs formation. Using the theory of petroleum system, the differences of the basic petroleum geology and all the influencing factors between Weiyuan gas field and Ziyang gas bearing area were analyzed, which indicated that there were the essential elements and the processes of the large gas field formation in Sinian Cambrian petroleum system and that among the four geological factors of controlling the Sinian gas field the forming time and size of trap are the most important. The trap formed during Himalayan orogeny could accumulate over mature gas and re migrated gas in the palaeohigh to form large gas field. Based on the above, the favorable exploration trap was chiefly anticline similar to Weiyuan and lithologic trap in Sinian formation of the palaeohigh and four areas were recommended as potential favorable exploration targe

关 键 词：寒武系 震旦系 含气系统 油气成藏 油气勘探 

分 类 号：P618.130.1[天文地球—矿床学] P618.130.8[天文地球—地质学]