摘要
煤层气是以吸附状态储集在煤层的微裂隙、裂缝中,煤层既是煤层气的源岩层,也是煤层气的储集层。由于煤层裂隙的存在,将导致煤层的各向异性;根据横波分裂理论:横波通过方位各向异性介质时,横波将发生分裂现象,分裂为两个偏振方向近乎正交的横波,即传播方向平行于裂隙方向的快横波和传播方向垂直于裂隙方向的慢横波。本文介绍了煤层裂隙引起的横波分裂现象的实验室研究及实际野外试验成果。实际结果表明,利用转换横波探测煤层裂隙是可行的。本文最后给出了试验区煤层裂隙发育范围和裂隙发育方向。
Coal bed gas preserved in the micro -f ractures or micro -rifts as absorbed status.coal -bed is source rock of co al bed gas,and also reservoir of coal bed ga s.The fracture will caused anisotro pism of coal -bed.Based on the theory of shear -wave split:shear -wave through into medi um of anisotropism will splited two s hear -waves which polarized directi ons nearly cross in right angle,that are fast shear -wav e which spread direction paralleled to fracture direction and slow shear-ware which spread direction perpendicular to fractur e direction.The paper has introduce d achievements on test in laboratory and field of shear -wave split caused by coal -bed fracture.S howing that is feasible to survey coa l -bed fractures with transformed sh ear -wave.Finally the paper predicted developed scope and direction of coal -bed fractures.
出处
《中国煤田地质》
2001年第3期57-58,66,共3页
Coal Geology of China
