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Seismic studies of coal bed methane content in the west coal mining area of Qinshui Basin

International Journal of Mining Science and Technology 2013年第6期23卷 795-803页

作者： Zou Guangui Peng Suping Yin Caiyun Xu Yanyong Chen Fengying Liu Jinkai State Key Laboratory of coal Resource and Safe Mining China University of Mining&Technology

The coal bed methane content(CBMC)in the west mining area of Jincheng coalfield,southeastern Qjnshui Basin,is studied based on seismic data and well-logs together with laboratory *** results show that the Shuey approximation has better adaptability according to the Zoeppritz equation result;the designed fold number for an ordinary seismic data is sufficient for post-stack data but insufficient for pre-stack data regarding the signal to noise ratio(SNR).Therefore a larger grid analysis was created in order to improve the *** velocity field created by logging is better than that created by stack velocity in both accuracy and effectiveness.A reasonable distribution of the amplitude versus offset(AVO)attributes can be facilitated by taking the AVO response from logging as a standard for calibrating the amplitude *** AVO attributes have a close relationship with *** worst attribute is polarization magnitude,for which the correlation coefficient is 0.308;and the best attribute is the polarization product from intercept,of which the correlation coefficient *** predicted by AVO attributes is better overall than that predicted by direct interpolation of CBMC;the validation error of the former is 14.47%,which is lower than that of the latter 23.30%.CBMC of this area ranges from2.5 m^3/t to 22 m^3/*** CBMC in the syncline is over 10m^3/t,but it is below 10m^3/t in the anticline;on the whole,CBMC in the syncline is higher than that in anticline.

关键词： coal bed methane content Amplitude versus offset AVO attribute Correlation coefficient

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