白杨河矿区煤层气藏划分及特征研究

Research on Reservoir Classification and Characteristics of Coalbed Methane Reservoir in Baiyanghe Mining Area

通过对白杨河矿区含煤地层的分布特征、煤层气控气地质条件和富集规律的研究,煤层气资源主要分布在八道湾组下段(J_1b_1)的39、41和42号煤层。39、41和42号煤层全区分布稳定,厚度大、含气量高,煤层分别控制了一定的储量规模,试采资料也已证实了39、41和42号煤层具有较好的产能潜力。39、41和42号煤层为3个相对独立的煤层气藏。39、41和42号煤层顶底板岩性主要为泥岩或砂质泥岩,其含水性弱、渗透性差,封盖条件较好。

Through the study of the distribution characteristics, geological conditions of coalbed methane and enrichment regularity of the coal bearing strata in Baiyanghe Mining area, the result shoes that the coalbed methane resources mainly distribute in the No. 39, 41 and 42 coal seams of the lower part of eight channel formation （Jib1）. The three coal seams are featured with stablely distribution, large thickness and high gas content, and respectively control a certain scale of coal reserves, which was confirmed with good potential productivity by production data. No. 39, 41 and 42 coal seams are 3 relatively independent coalbed methane reservoirs, and the roof and floor lithology is mainly mudstone and sandy mudstone with weak water, poor permeability and good capping conditions.