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。
Production of coal bed methane in China mainly come from abundant coal bed methane enrichment zones of coal-bearing ba- sins, 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 （）rdos Ba sin 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. （;-as 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.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第3期417-426,共10页
Acta Petrolei Sinica
基金
国家重点基础研究发展计划(973)项目(2009CB219600)资助
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
abundant coal bed methane enrichment zone
gas content
permeability
coupling
enrichment pattern
