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从煤岩煤质、含气性、吸附特征、裂隙发育及渗透性等方面对湘中下石炭统测水组煤层气储层(煤储层)特性进行论述。研究表明煤储层为明显的富镜质组煤,随温度、压力的增加吸附量增大。区内煤层最大含气量为41.91m3/t,以新化芦毛江至金竹山一带为中心,包括芦毛江、冷水江、渣渡、金竹山等矿区,高富集区基本呈东西向展布。但受煤阶的影响,煤层内生裂隙发育程度明显低于龙潭组煤层,同时由于煤层煤体结构连通性差以及多起构造运动形成细小的煤粉常充填于构造裂隙中,降低了煤层的渗透性。针对上述煤储层特点,指出加强对具有上封下开裂隙系统以及原生结构煤和碎裂煤整层发育地区的煤层气勘探尤为重要。
The characteristics of coalbed methane reservoirs (coal reservoirs) in the Middle and Lower Carboniferous Hydrologic Reservoirs are discussed in terms of coal quality, gas content, adsorption characteristics, fracture development and permeability. The study shows that the coal reservoir is obviously rich in vitrinite, and the adsorption capacity increases with the increase of temperature and pressure. The maximum gas content of the coal seam in the area is 41.91m3 / t, taking Xinhua Lumajiang River to Jinzhushan area as the center, including the Luoma River, Lengshuijiang River, Zhaduu River and Jinzhushan Mining Area. The high-enriched area basically shows east-west development cloth. However, due to the effect of coal rank, the developmental degree of endogenous fissures in coal seams is obviously lower than that of Longtan Formation. At the same time, coal seams are often infiltrated due to the poor connectivity of coal seams and the formation of fine coal powder during tectonic movement. Sex. According to the characteristics of the above coal reservoirs, it is pointed out that it is especially important to enhance the CBM exploration in the areas with the upper seal, the open and the crack, the whole structure of primary structural coal and fragmented coal.