影响中国无烟煤区煤层气勘探的主要因素

The main factors affecting coalbed methane exploration of anthracite area in China.

中国无烟煤分布区的特点是聚煤期后的地质时代构造活动强烈，使煤层原始结构遭受严重破坏，因此含气量虽高，但渗透率低、可解吸气量低。根据对中国无烟煤区煤层气勘探现状和存在主要问题的分析，认为这类地区煤层气勘探中选区不当和增产措施不配套，是勘探未获得实质性进展的主要原因。指出次生裂缝发育带是高渗透性煤层分布带，是有望获得突破的有利勘探选区，套管射孔压裂是有效的增产措施。图２表２参４（梁大新摘）

The characteristic of anthracite area in China is that the strong tectonic movement after geologic period destroyed seriously the coal bed primary structure, so the permeability and gas adsorbance solvability are low, in spite of the gas content is high. Base on the analysis of coalbed methane exploration status, the main reasons of the exploration failure are that the exploration area selected is unsuitable and the stimulation is unfit as well. The secondary fracture area as high permeability coal area is hopefully beneficial for exploration and fracturing by perforating through casing is a effective stimulation tool.