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.