基于煤层气产出的煤岩学控制机理研究进展
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摘要
为给煤层气的高效开发提供理论参考,对煤层气开发地质理论和基于煤层气产出的煤岩学控制机理研究进展及存在的问题进行了系统分析,指出由于煤储层煤岩组成及本构关系差异显著,当前煤岩学主控的煤储层储渗空间特征及其与产能耦合关系研究远不能满足煤层气开发需求,表现为:对煤储层非均质发育特征及其开发动态效应认识不够;储层改造及煤层气排采的针对性不强;生产过程中无法有效地从地质角度规避各种层内(间)矛盾。阐明煤岩制约下的储层有效孔渗空间发育特征、层内(间)本构关系变化及煤层气开发过程储层物性响应成为亟待探索的科学问题。通过研究形成适配的层内—层间、宏观—微观、初始—动态煤岩描述理论和方法将成为促进煤层气开发地质理论发展的重要方向。
In order to provide the theoretical references for high efficient coalbed methane( CBM) exploration and development,the systematic analysis was made on the current situation and existing problems of coal petrology control mechanism on CBM production and CBM development geological theory. The paper pointed out that there were significant differences on the petrological composition and constitutive relation of coal reservoirs. So far,the research about the storage- permeable spaces characteristics of coal reservoirs and its coupling relationship with CBM production which were dominated by coal petrology was far from reaching the technology requirements of CBM development. The specific performance as the following,insufficient understanding of the heterogeneity of coal reservoir development characteristics and development dynamic effect,lack of pertinence for reservoir reformation and CBM drainage,it could not avoid the various layers( inter) contradiction from the geological aspects during CBM production. Clarifying the storage- permeable spaces characteristics controlled by coal petrology,the constitutive relation variation in internal or interlayer,and the reservoir physical properties response in CBM exploring process have become scientific problems and are urgent to be explored. The adapted descriptivist theory and method of coal petrology in layer- interlayer,macroscopic- microcosmic and initial- dynamic will be the future research direction.
In order to provide the theoretical references for high efficient coalbed methane( CBM) exploration and development,the systematic analysis was made on the current situation and existing problems of coal petrology control mechanism on CBM production and CBM development geological theory. The paper pointed out that there were significant differences on the petrological composition and constitutive relation of coal reservoirs. So far,the research about the storage- permeable spaces characteristics of coal reservoirs and its coupling relationship with CBM production which were dominated by coal petrology was far from reaching the technology requirements of CBM development. The specific performance as the following,insufficient understanding of the heterogeneity of coal reservoir development characteristics and development dynamic effect,lack of pertinence for reservoir reformation and CBM drainage,it could not avoid the various layers( inter) contradiction from the geological aspects during CBM production. Clarifying the storage- permeable spaces characteristics controlled by coal petrology,the constitutive relation variation in internal or interlayer,and the reservoir physical properties response in CBM exploring process have become scientific problems and are urgent to be explored. The adapted descriptivist theory and method of coal petrology in layer- interlayer,macroscopic- microcosmic and initial- dynamic will be the future research direction.
引文
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