Abstract:

It is important to identify coal structure based on logging data for coalbed methane(CBM) exploration and development. By analysis the logging data of eighty wells in the Zhengzhuang block of Qinshui Basin, the typical characteristic values and frequency histograms had been summarized with the logging parameters of No.3 and No.15 coal seams. Based on the condition of the research area, the coal structures were divided into three types such as the original structure coal, the cataclastic structure coal, and the particle structure coal. And for those coal structures  and partings, the typical characteristic values of logging response had been determined. It was shown that the sensitive parameters of logging to recognize the coalbed methane and fractured features were successively as DEN, RD, AC, CAL, GR and CNL in this area. And then by compare the difference of deep, shallow laterolog resistivity and flushed zone resistivity to identify the development degree of fractures, several modes for recognizing fracture development characteristics with sensitive parameters of well logging for CBM reservoir had been built.

Key words: Qinshui Basin, coalbed methane, tectonic deformed coal, logging response