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《Progress in Geophysics》 2017-04
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Study on volcanic lithology identification methods based on the data of conventional well logging data:a case from Mesozoic volcanic rocks in Bohai bay area

YE Tao;WEI A-juan;DENG Hui;ZENG Jin-cang;GAO Kun-shun;SUN Zhe;CNOOC China Ltd.Bohai Oil Institute;Drilling and Production Engineering Research Institute,CNOOC Energy Technology & Service;  
The Mesozoic volcanic rocks of Bohai bay area are widely distributed and difficult to identify without FMI and ECS data.Based on the abundant data of cores,lateral cores and rock sections,volcanic identification methods has been studied with the comprehensive methods for using of the conventional well logs.The result shows that the curve features can describe lithology qualitatively but influenced by human factor.Using a little information of the curves,the identification accuracy of cross plot is relatively low whereas the identification accuracies of decision tree and Bayes stepwise discrimination are higher for using more information of the curves.The indentified lithology profile of decision tree method changes severely in response to the single sensitive curve.The stability of the Bayes method is relatively high for the using of multi-curves.Comprehensive interpretation of the lithology need both of the result of Bayes and decision tree,and also with the constraint of integrated curves and crossplot at the same time,which can improve the accuracy of identified lithology.
【Fund】: 国家重大专项(2011ZX05023-006-002)资助
【CateGory Index】: P618.13;P631.81
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