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山西组二_1煤厚度大,煤质好、煤级适中,是煤层气勘探的主要目的层。通过对62口井、146块煤样含气量测定,煤层埋深为200～300m的含气量小于5m~3/t,甲烷为80％以下,埋深大于300m的两者分别为7～20m~3/t和80％以上。全区含气量东高西低,向南向北变低。含气量主要受煤的变质程度、煤层埋藏深度、构造断裂和煤岩灰份等因素的影响。研究认为,该区煤层形成环境好、煤岩类型好、埋深适中、煤层结构保存完好的区域有利于煤层气的生成和储集。根据煤层厚度、埋深、煤阶、煤质、断裂以及经济技术条件将全区划分为最有利区、有利区、较有利区和不利区。
Shanxi Group II _1 coal thickness, good coal quality, moderate coal rank, is the main purpose of CBM exploration layer. By measuring the gas content of 62 coal samples from 62 wells, the gas content of coal seam with depth of 200 ~ 300m is less than 5m ~ 3 / t, methane is below 80% and depth of more than 300m is 7 ~ 20m ~ 3 / t and over 80%. The gas content of the whole area is high in the west and low in the west and low in the south. The gas content is mainly affected by the degree of coal metamorphism, the depth of coal seam burial, tectonic fractures and coal rock ash and other factors. The study shows that the formation of coal seams in this area is good, the type of coal and rock is good, the depth of burial is moderate, and the area with well-preserved coal seam structure is favorable for the formation and accumulation of coalbed methane. According to the thickness of coal seam, burial depth, coal rank, coal quality, fracture and economic and technical conditions, the whole area is divided into the most advantageous area, favorable area, more favorable area and unfavorable area.