Abstract: It is over thirty years since the large Weiyuan gas field was discovered in 1964.How to select better area for exploration and find out another large gas field in the Sinian of the gas formation if Sichuan Basin is a very interesting target.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,and obtained that among the four geological factors of controlling the Sinian gas field the size of trap is the most important.Based on the above,the ideas of exploration and the standard of selecting favorable area in the Sinian gas bearing formation in the Sichuan Basin were put forward and the Panlongchang subtle trap were recommended as another potential Weiyuan like large gas field.

Key words: large gas field, petroleum system, basic factors, favorable area, Sichuan Basin, Sinian

摘要： 自1964年发现威远大气田后,迄今已30余年了.今后将如何在四川盆地震旦系含气层中选择有利的区块及争取发现第二个威远大气田是人们感兴趣的问题.文中应用含油气系统的理论和方法,初步对比分析了威远气田和资阳地区的“先天”基本石油地质要素和“后天”遭受地质作用的差异,总结出控制震旦系气藏的4条主要地质因素,其中起主导作用的因素是圈闭大小和隆起幅度的高低.从而提出在四川盆地震旦系含气层中的勘探思路和选择有利区块的依据,并指出川中盘龙场潜伏构造有可能找到第二个威远大气田.

关键词: 大气田, 含油气系统, 基本要素, 有利区块, 四川盆地, 震旦系