开平—涧河地区煤层气勘探前景

开平—涧河地区石炭二叠系煤层以9#和12#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R_o值在0.85%～1.26%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30.05m3/t,3.13MPa。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600m。煤层含气量6～12m3/t,估算煤层埋深在600～1500m范围内煤层气资源量为705×108m3。城坨—小营地区可作为煤层气试验区。 

ANALYSIS OF COALBED METHANE EXPLORATION PROSPECT IN KAIPING-JIANHE

Permo Carboniferous 9 # and 12 # coal beds are distributed steadily in Kaiping Jianhe Area.The vitrinite of maceral is more than 70%.The coal maturation are changed,Ro is between 0.85% and 1.26%,the higher rank distributed in the northwest part of this area and become lower to the southeast.The cleats developed with similar dip,and most of them are unfilled by mineral matter. The sorption isotherm shows that the Langmuir sorption is 30.03 m 3/t, the Langmuir pressure is 3.13 MPa.The thickniess of overlying rock is becoming thinner form northto south.The underground water in the syncline banks near the faults is active and the degree of mineralization is lower than in the southeast.The coalbed methane reserve in depth between 600 meters and 1500 meters is 705×108m 3;the gas content is between 6-12 m3/t.Chengtuo Xiaoying block may become coalbed methane experimentation aera.