河南省下二叠统山西组二_1煤煤层气储层描述

Coalbed Methane Reservoir Description of Ⅱ 1 Coal in Shaixi Formation (Low Permian), Henan Province

从煤厚、煤岩组成、煤级、煤体结构、裂隙系统、渗透性、吸附／解吸特性等方面对河南省的主可采煤层二１煤的煤层气的储层特征进行了详细论述．指出镜质组含量较高、割理比较发育、外生裂隙发育适中的原生结构煤和碎裂煤渗透性最好，是最有利的储层；外生裂隙发育适中的无烟煤是有利储层；碎粒煤为不利储层；糜棱煤为不可开发储层．临界解吸压力较高、含气量较高的中煤级煤分布区是煤层气勘探开发的首选地区．

The main factors which control coalbed methane exploration and development are coal thickness, maceral, rank, coal structure, fracture system, permeability and sorption/desorption. The coalbed methane reservoir of Ⅱ 1 in Shaixi formation of Henan province are described through these factors. The most favorable reservoir possesses middle rank, high vitrinite content, primary structure of fissure structure. The unfavorable reservoir possesses clactic structure. The coalbed methane can be developed from mylonitic coal reservoir. High critical desorption pressure and gas content will be favorable to coalbed methane development.