石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (2): 277-285.doi: 10.11743/ogg20220203
收稿日期:
2020-11-16
修回日期:
2022-01-17
出版日期:
2022-04-01
发布日期:
2022-03-11
通讯作者:
董昭雄
E-mail:Hefq.hbsj@sinopec.com;Dongzx.hbsj@sinopec.com
第一作者简介:
何发岐(1967—),男,博士、教授级高级工程师,石油与天然气勘探与开发。E?mail:Received:
2020-11-16
Revised:
2022-01-17
Online:
2022-04-01
Published:
2022-03-11
Contact:
Zhaoxiong Dong
E-mail:Hefq.hbsj@sinopec.com;Dongzx.hbsj@sinopec.com
摘要:
煤成气理论指导下煤系“源外型”大气田的陆续发现有效促进了中国天然气工业的发展,而“源内型”煤层气却发展缓慢。研究认为“源内型”深部(2 000 m以深)煤层气同样具有巨大的勘探潜力。以鄂尔多斯盆地大牛地气田为例,通过石炭系-二叠系含煤地层取心系统开展实验研究,结果表明煤系岩石普遍含气,其中煤层中存在原地游离气且煤层气资源丰度最高为3.86×108 m3/km2;结合地层埋藏和热演化史,认为层状非均质地层中泥岩和灰岩的喉道半径较小,毛管阻力封堵形成了以砂岩和煤岩为主的煤系岩性圈闭,煤岩(性)圈闭是其中游离气形成的主控因素;煤岩心含水饱和度介于6.5 %~30.1 %,较低的含水饱和度使常规煤层气开采过程中的“排水减压”变成了“排气降压”,有利于深部煤层气的动用;原生-碎裂型煤体结构也是储层压裂改造的有利特征。研究认为深部煤层气是煤系“甜点”资源,辅以科学合理的技术和经济手段可实现有效开发。
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