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开平—涧河地区石炭二叠系煤层以 9# 和 1 2 # 煤层分布最稳定 ,煤岩组分以镜质组为主 ,平均达 70 %以上。煤热演化成熟度 Ro值在 0 .85%～ 1 .2 6%之间 ,煤阶分布具有从北往南、向斜轴部向两翼降低的特点。煤层割理倾向稳定 ,不受构造线影响 ,大多未被充填。等温吸附实验表明 ,煤的兰氏体积和兰氏压力分别为 30 .0 5m3 /t,3.1 3MPa。煤微孔结构根据吸附等温线和孔径分布特征可分为 3类。煤层上覆地层有效厚度具有由北向南减薄特点 ,北部向斜两翼断层带附近水体交替活跃 ,矿化度低 ,南部水体不活跃 ,矿化度高。煤层瓦斯分化带下限为 60 0 m。煤层含气量 6～ 1 2m3 /t,估算煤层埋深在 60 0～ 1 50 0 m范围内煤层气资源量为 70 5× 1 0 8m3。城坨—小营地区可作为煤层气试验区
The Permian Permian coal seams in Kaiping-Jianhe area are most stable with 9 # and 12 # coal seams. The main components are vitrinite, with an average of over 70%. The Ro value of coal thermal evolution and maturity is between 0.85% and 1.26%, and the coal rank distribution has the characteristics of reducing to two wings from north to south and the axis of syncline. Coal seams tend to be stable and are not affected by the tectonic line and are mostly not filled. Isothermal adsorption experiments show that the coal’s Rankine’s volume and Rankine’s pressure are 30. 05m3 / t, 3.13MPa. Coal micropore structure can be divided into three categories according to adsorption isotherms and pore size distribution. The effective thickness of overlying strata in coal seam is characterized by thinning from north to south. The water bodies near the fault zone in the northern syncline are alternately active with low salinity, inactive water in the south and high salinity. The lower limit of coal gas division zone is 60 0 m. The coalbed gas content is 6 ~ 12m3 / t, and the estimated coalbed methane resource is 70 5 × 1 0 8m3 in the range of 60 0 ~ 1 50 0 m. Cheng Tuo - Xiaoying area can be used as CBM pilot area