低煤阶煤层气成藏条件及主控因素分析

Reservoir Forming Conditions and Main Controlling Factors of Low-rank Coal-bed Methane

低煤阶煤层气在我国资源丰富,具有良好的勘探前景。作为一种非常规气藏,其在烃源条件、运移方式、储集条件、圈闭机制、流体存在状态等方面与常规天然气藏均存在较大差别。低煤阶煤层气富集的主控因素分为内因和外因两大类,其中煤岩演化程度、显微组分、温度、水分、构造为主要影响因素。

Low rank coal-bed methane is abundance in China and has a good exploration prospects. As an unconventional gas reservoir, it is different with conventional natural gas in hydrocarbon source, migration method, reservoir conditions, trapping conditions, and the fluid state of existence. The controlling factors for low rank coal-bed methane accumulation are analyzed and divided into internal and external factors. Furthermore, the evolution stages of coal rock, micro-components, temperature, moisture, and structure are the main factors.