四川盆地元坝地区自流井组页岩气成藏条件

按照页岩气勘探思路和成藏特点，四川盆地元坝地区一批探井针对自流井组泥页岩录取了资料，其中3口井测试获得了工业气流。研究表明，元坝地区自流井组形成于浅湖-半深湖环境，暗色泥页岩厚度较大，有机碳含量高，有机质热成熟度适中,处于生气高峰期。泥页岩矿物成分中石英含量普遍在60%以上，粘土含量在30%以下,泥页岩含气量高，具备页岩气形成和勘探的基本条件，是页岩气勘探的有利层系。

Reservoir-Forming Conditions of Shale Gas in Ziliujing Formation of Yuanba Area in Sichuan Basin

According to the ideas of exploration and the reservoir accumulation characteristics of shale gas,we have collected shale gas data in Ziliujing Formation from a batch of exploratory wells in Yuanba area of Sichuan basin.And industrial gas flow has been discovered in three wells of the exploratory wells.Research shows that Ziliujing Formation in Yuanba area is formed in shallow lake-semi-deep lake environment.Thick dark shale,high content of organic carbon and moderate thermal maturity of organic matter which is at the peak of gas production are developed in Ziliujing Formation.Moreover,quartz content is generally more than 60% in the mineral composition of shale,while clay content is below 30%.Gas content is high in shale of Ziliujing Formation,which is the basic condition for the formation and exploration of shale gas.And Ziliujing Formation is the favorable strata for the shale gas exploration.