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《Progress in Geophysics》 2015-05
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Two key points of rock-physics template and its application

ZHANG Wan-long;SUN Zan-dong;HE Xin-wei;WU Bo-fu;Laboratory for Integration of Geology and Geophysics Research,China University of Petroleum;CGG GeoSoftware Asia Pacific;  
Rock-physics template(RPT)was used broadly in oil and gas exploration and development recent years,and was considered as the key technology during quantitative seismic interpretation,but there are two important point we need to take care:one question is how to do facies classification,the other question is how to choose the most sensitive petro-elastic parameters group when making RPT.Currently,most of the geoscientist choose the most sensitive petro-elastic parameters based on the relative changes of each facies mean value,and then,using the polygon technology to do facies classification.The main problem in it is that,for facies classification,this does not take the random noise and measure error into consideration,and the result maybe not objective,even got the absolutely wrong outputs.In order to improve the accuracy of quantitative seismic interpretation,this paper advised to take both means value and standard deviation of each facies into consideration when choosing most sensitive petro-elastic parameters group,the criteria is the percentage of overlap area for each facies probabilitydistribution,and using Bayesian theory to do facies classification based on each facies probability density function and the instruction of RPT.Compared to conventional method, those two improvements for RPT application can tremendously improve the accuracy of quantitative seismic interpretation,has the benefit of avoid falling into the interpretation pitfalls.
【CateGory Index】: P631.4
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