石油学报 ›› 2013, Vol. 34 ›› Issue (3): 417-426.DOI: 10.7623/syxb201303001

• 地质勘探 •    下一篇

含气量和渗透率耦合作用对高丰度煤层气富集区的控制

宋岩1,2, 柳少波1, 琚宜文3, 洪峰1, 姜林1, 马行陟1, 卫明明3   

  1. 1. 中国石油勘探开发研究院 北京 100083;
    2. 中国石油大学油气资源与探测国家重点实验室 北京 102249;
    3. 中国科学院大学 北京 100049
  • 收稿日期:2013-03-04 修回日期:2013-03-22 出版日期:2013-05-25 发布日期:2013-04-09
  • 通讯作者: 宋岩
  • 作者简介:宋 岩,女,1957年10月生,1982年毕业于华东石油学院,2003年获中国科学院博士学位,现为中国石油勘探开发研究院教授级高级工程师和中国石油大学(北京)非常规天然气研究院院长,主要从事天然气地质研究工作。Email:sya@petrochina.com.cn
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2009CB219600)资助。

Coupling between gas content and permeability controlling enrichment zones of high abundance coal bed methane

SONG Yan1,2, LIU Shaobo1, JU Yiwen3, HONG Feng1, JIANG Lin1, MA Xingzhi1, WEI Mingming3   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. State key Laboratory of Petroleum Resource & Prospecting, China University of Petroleum, Beijing 102249, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-03-04 Revised:2013-03-22 Online:2013-05-25 Published:2013-04-09

摘要:

煤层气的产量主要来自含煤盆地高丰度煤层气富集区,但目前对高丰度煤层气富集区形成的控制因素、形成机制与模式认识不清,制约了煤层气的勘探和工业化进程。通过对沁水盆地南部、鄂尔多斯盆地东缘和淮北地区煤层气富集区地质特征的分析,明确了煤层含气量和渗透率的耦合作用是高丰度煤层气富集区形成的机制。煤层的含气量受水动力条件和煤层顶、底板条件的影响;变质程度、构造变形和地应力是控制渗透率大小的关键因素。在结合实际地质特征和物理模拟实验的基础上,建立了2种中高煤阶高丰度煤层气富集区形成模式,即斜坡区含气量和渗透率优势叠合富集模式和脆韧性叠加带煤层气富集模式。

关键词: 高丰度煤层气富集区, 含气量, 渗透率, 耦合作用, 富集模式

Abstract:

Production of coal bed methane in China mainly come from abundant coal bed methane enrichment zones of coal-bearing basins, however, current uncertainties in understanding controlling factors, formation mechanisms and patterns of abundant coal bed methane enrichment have, to a certain extent, restricted exploration and industrialization progresses of coal bed methane. Through investigation of geologic characteristics of coal bed methane enrichment zones in southern Qinshui Basin, eastern margin of Ordos Basin and Huaibei area, the present study clarified that coupling between gas content and permeability is a major formation mechanism of an abundant coal bed methane enrichment zone. Gas content of coal beds is greatly affected by hydrodynamic and adjacent rock conditions of coal beds, while degree of metamorphism, structural deformation and ground stress of coal beds are key factors that control permeability of coal beds. Combined geological features with physical simulation experiments, two enrichment patterns of high abundance coal bed methan of high rank coals are proposed, which are the predominance superposition of the gas content and permeability in slope and the brittle-ductile superimposition of coal methane, respectively.

Key words: abundant coal bed methane enrichment zone, gas content, permeability, coupling, enrichment pattern

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