四川盆地大中型天然气田分布特征与勘探方向

Distribution and further exploration of the large-medium sized gas fields in Sichuan Basin

四川盆地是中国最早开展天然气勘探开发和综合利用的地区。经过50多年的工业性勘探开发,发现了27个大中型气田,建成了中国第一个超100×108m3产能的天然气生产基地。勘探及研究表明,四川盆地大中型气田主要集中分布在二叠系和三叠系,以孔隙型、裂缝—孔隙型气藏为主,并已形成了几个大型气田群。认识创新、思路创新和技术进步是四川盆地勘探发展的关键。通过总结四川盆地大中型气田的分布特征,进一步探讨了盆地勘探发展的方向,指出川东及川西的深层超深层、川东及川中陆相中浅层、山前带、嘉陵江组鲕滩和大型区域不整合等是下步勘探的重点领域。

Sichuan Basin is the place in which natural gas was firstly explored and comprehensively utilized in China.27 large-medium sized gas fields have been discovered and the gas production capacity more than 100×108m3 has been constructed on the basis of over 50 years of industrial exploration and production.The large-medium sized gas fields are mainly distributed in eastern and western Sichuan Basin,and the main reservoir is Permian and Triassic.The porous types of reservoir is porosity and porosity-fractured.Innovative understanding,creative ideas and developed technology are three key factors controlling the development of the exploration within the basin.This research summarizes the distribution characteristics of the large-medium sized gas fields,and some advises are proposed for further exploration in this basin.It is pointed out that the deep and super-deep reservoirs such as Permian and Triassic in west and east,middle-shallow reservoirs of Triassic continental deposit in east and middle,piedmont zone,Jialingjiang Formation oolitic shoals and regional unconformities are important regions to explore in Sichuan Basin.