天然气地球科学

• 天然气地质学 • 上一篇    下一篇

沁水盆地砂岩游离气成藏主控因素分析

林玉祥,栾伟娜,韩继雷,张春荣,吴玉琛,李秀芹   

  1. 山东科技大学地球科学与工程学院,山东 青岛 266590
  • 收稿日期:2014-11-12 修回日期:2015-06-02 出版日期:2015-10-10 发布日期:2015-10-10
  • 作者简介:林玉祥(1963-),男,山东临清人,教授,博士,主要从事油气地质研究. E-mail:sdkdlyx@126.com.
  • 基金资助:

    国家自然科学基金(编号:41172108;71303140);国家科技重大专项(编号:2011ZX05004-01;2011ZX05033-04)联合资助.

Main Controlling Factors on Sandstone Free Gas Accumulation in the Qinshui Basin

LIN Yu-xiang,LUAN Wei-na,HAN Ji-lei,ZHANG Chun-rong,WU Yu-chen,LI Xiu-qin   

  1. College of Geological Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China
  • Received:2014-11-12 Revised:2015-06-02 Online:2015-10-10 Published:2015-10-10

摘要:

沁水盆地石炭系—二叠系砂岩大多含有一定数量的游离气,并常常与煤层气藏相伴生,成为煤层气资源的有效补充。由于其成藏具有致密砂岩气低孔低渗、连续分布的特点,往往与深盆气混淆,其成藏主控因素也难以正确认识。在大量实际数据基础上,采用统计分析法,弄清了其成藏主控因素,从而更深刻地揭示了该类气藏的成因机制。研究表明,该类气藏是煤层气散失过程中暂留于砂岩中形成的,与煤层气处于动态平衡状态中。在煤层含气的前提下,砂岩顶板泥岩排替压力是砂岩游离气含量最主要的控制因素,其次是砂岩孔隙度。因而应在煤层气含量高、盖层突破压力大与砂岩孔隙度较高的地区寻找这类气藏。

关键词: 沁水盆地, 石炭系一二叠系, 砂岩游离气, 成藏条件, 主控因素

Abstract:

There are a certain number of free gases in the Carboniferous-Permian sandstone in the Qinshui Basin,which are always accompanied by coal-bed methane.It has been a complement to the resource of coal-bed methane.As the accumulation has the features of low porosity,low permeability and continuous distribution like the tight gas,it is always confused with the deep basin gas.It is difficult to know the main controlling factors on accumulation correctly.On the basis of a lot of actual data,with the method of statistical analysis,this study investigates the main controlling factors of reservoir and discusses the genetic mechanism of such kind of gas reservoir more deeply.The results show that this kind of gas accumulation was formed when the CBM was lost and temporarily stays in the sandstone formation,which are in dynamic equilibrium with the CBM.On the premise of the coal-seam with gas,the displacement pressures of mudstone in sandstone roof is the main controlling factor,then followed by the porosity of sandstone.So we can look for this type of gas in the area with high content of CBM,high displacement pressures of roof mudstone and high porosity of sandstone.

Key words: Qinshui Basin, Carboniferous-Permian, Free gas in sandstone, Accumulation conditions, Main controlling factors

中图分类号: 

  • TE122.3

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