Influences of development characteristics of faults on coalbed methane well productivity in Southern Shizhuang Block

XING Liren; LIU Yinghong; WANG Cunwu; CHEN Silu; GUO Guangshan

doi:10.13199/j.cnki.cst.2017.09.005

Abstract：In order to illustrate the control effect of fault sealing capability on the coalbed methane production,the shale gouge ratio (SGR) and the clay-smear potential (CSP) are used to analyze lateral sealing capability of three typical faults in southern Shizhuang Block,Qinshui Basin.On basis of the former initial results,relationship between the distance to fault and coalbed methane well productivity has been analyzed.The result shows that the reverse fault with relatively small development scale (extended length＜2 000 m,fault throw＜50 m) has suffered squeezing action at some extent.It has good sealing capability (SGR＞50％,CSP＞ 15 m).There is a negative correlation between the distance and coalbed methane production.The reverse fault with large development scale (extended length＞5 000 m,fault throw＞60 m) has suffered squeezing action more strongly.The coalbed methane reservoir is destroyed.The sealing capability (SGR＜50％,CSP＜ 12 m) is moderate.The gas production will rise with the distance to fault increasing.The hanging wall of Sitou fault is destroyed more strongly.The sealing capability of the footwall is better than that of the hanging wall.The coalbed methane production at the footwall of Sitou fault is higher.It has a upward trend with the distance increasing.