煤层气富集高产的主控因素

Main Controlling Factors Analysis of Enrichment Condition of Coalbed Methane

对煤岩的生储气能力、煤储层渗透率、煤层气保存条件等影响煤层气高产富集的主控因素进行了分析。煤岩组分和煤变质程度是影响煤层生储气能力的主控因素。煤层的储气能力与温度、压力、灰分及水分含量等亦有关。煤层的渗透率取决于煤层本身的裂隙系统 ,而裂隙的发育程度又与煤变质程度及构造活动的强弱相关。煤层气的保存则取决于顶底板的封盖能力、构造活动、水动力环境等条件。煤层气成藏条件是煤层气基础地质研究中的核心问题 ,应加强研究。

In this paper, the authors have analyzed the main controlling factors that affect enrichment and high production of coalbed methane (CBM), such as generating and storing capacity of coal rock, permeability of coal reservoir and preservation conditions of CBM. Research shows that maceral and the degree of metamorphism of coal rock are key factors that control the generating and storing capacity of coal rock. Temperature, pressure and the content of mineral substance and water are also relevant to the storing capacity of coal rock. However, the permeability of coalbed is mainly controlled by fracture system of coal rock, which is relevant to the maturity of coal and the intensity of tectogenesis. The preservation of CBM pool is mainly controlled by the sealing capacity of roof and floor plate, tectonic activity and hydrodynamic environment. Because of its important role, we'd better strengthen the research on CBM pool forming conditions.