Study on heterogeneity of coal reservoir in Zhengzhuang Block of south Qinshui Basin

in order to discover the longitudinal heterogeneity of the cal reservoir and its lnfluence on to the development selected block of thecalbed methane,based on Zhengzhuang Block as an example and based on the coal core,measurement and logging information,the parametererror coefficient and RIS analysis method were applied to the study on the geological control law of the coal reservoir heterogeneity development.The results showed that the heterogeneity features of the coalbed methane gas content were generally weak in longitudinal and would have thefeatures of weak on roof and strong in middle part within a same seam. On the plane,the structure relative simple area would be very weak,the area closed to the fault or lateral crossed fault would be strong and the variation would not be in a law.T'he heterogeneity features of the crack development in the coal reservoir would be high parameter eror coefficient and fractal dimension of the crack density in the resevoirs at medium fault development zone at the middle part and the large fault development zone at the east part and the heterogeneity ofthe reservoit were strongThe comprehensive predicted results showed that in the wells of Z66—Z58—Z27 controlled annula zone at the cental of Zhengzhuang Block ndthe strip zone along the large strike at the east part,the longitudinal heterogeneity of the coal reservoir would be strong and would not be favorable to the development of the coalbed methane.