Application of Seismic Anisotropy Caused by Fissures in Coal Seams to the Detection of Coal-bed Methane Reservoirs

查看全文 作　　者：LIU [1]Mei;GOU [1]Jingwei;YU [1]Guangming;LIN [1]Jiandong 机构地区：[1]Research Institute of Coal Geophysical Exploration,Zhuozhou 072750,Hebei 出　　处：《Acta Geologica Sinica(English Edition)》索引2000年第74卷第2期,共4页 摘　　要：Coal-bed methane is accumulated in micro-fissures and cracks in coal seams. The coal seam is the source terrace and reservoir bed of the coal-bed methane (Qian et al., 1996). Anisotropy of coal seams is caused by the existence of fissures. Based on the theory of S wave splitting: an S wave will be divided into two S waves with nearly orthogonal polarization directions when passing through anisotropic media, i.e. the fast S wave with its direction of propagation parallel to that of the fissure and slow S wave with the direction of propagation perpendicular to that of the fissure.This paper gives the results of laboratory research and field test on the S wave splitting caused by coal-seam fissures: The results show that it is, feasible to detect fissures in coal seams by applying the converted S wave and finally gives the development zone and development direction of these fissures. 关 键 词：coal-bed methane coal-seam fissure ANISOTROPY splitting of S wave