石油学报 ›› 2010, Vol. 31 ›› Issue (2): 225-230.DOI: 10.7623/syxb201002008

• 地质勘探 • 上一篇    下一篇

四川盆地下志留统龙马溪组页岩气成藏条件及有利地区分析

蒲泊伶 1 蒋有录 1 王 毅 2 包书景 2 刘鑫金 1   

  1. 1中国石油大学地球资源与信息学院 山东东营 257061; 2中国石化石油勘探开发研究院 北京 100083
  • 收稿日期:2009-04-13 修回日期:2009-10-16 出版日期:2010-03-25 发布日期:2013-10-31
  • 通讯作者: 蒲泊伶

Reservoir-forming conditions and favorable exploration zones of shale gas in Lower Silurian Longmaxi Formation of Sichuan Basin

PU Boling 1 JIANG Youlu 1 WANG Yi 2 BAO Shujing 2 LIU Xinjin 1   

  • Received:2009-04-13 Revised:2009-10-16 Online:2010-03-25 Published:2013-10-31
  • Contact: PU Boling

摘要:

四川盆地下志留统龙马溪组发育富含有机质页岩。作为页岩气的源岩,该套页岩在盆地内分布广泛,厚度大,有机质含量高,有机质类型好,热演化程度高,生气潜力大;作为储层,页岩中孔隙和裂缝发育,为页岩气提供了充足的储集空间,并且等温吸附实验也表明,页岩具有较强的气体吸附能力;由于页岩的致密性及抗构造破坏性,本地区构造条件满足页岩气成藏要求。多口井下志留统页岩的气测显示也为页岩气的存在提供了有利证据。根据页岩厚度、有机碳含量、热演化程度和生烃强度等信息,预测宜宾—自贡—泸州一带及达州—万县一带为页岩气的有利勘探区域。

关键词: 四川盆地, 龙马溪组, 页岩气, 热演化程度, 气体吸附能力, 成藏条件, 有利勘探区带

Abstract:

There develops shale with rich organic matters in Longmaxi Formation of the Lower Silurian in Sichuan Basin. This shale with a great thickness is the source of shale gas and widely distributed in the basin. As the source,the shale is characterized as high organic content,good organic type and high organic thermal evolution degree.As the reservoir,there exits great quantity of cracks,porous and wrinkles,which offers sufficient accumulated space for shale gas. The isothermal adsorption test shows that the shale has strong ability of gas adsorption. The structural condition in this basin is available for forming shale gas reservoir. The gas shows of many wells drilled in the shale strata of the Lower Silurian in this area indicated the great potential of shale gas. The shale indexes of thickness distribution, organic carbon content, thermal evolution degree and gas generation level in Sichuan Basin show that Yibin-Zigong-Luzhou and Dazhou-Wanxian areas are the favorable zones for shale gas exploration.

Key words: Sichuan Basin, Longmaxi Formation, shale gas, thermal evolution degree, ability of gas adsorption, reservoir-forming conditions, favorable exploration zone