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《Journal of Palaeogeography》 2011-03
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Sedimentary facies recognition using lithological statistics——Example from delta deposits of Pearl River Mouth Basin

Yu Ye1,2 Zhang Changmin1,2 Zhang Shangfeng1,2 Shi Hesheng3 Du Jiayuan1,2,3 Zhu Rui1,2 1 School of Geosciences,Yangtze University,Jingzhou434023,Hubei 2 MOE Key Laboratory of Oil and Gas Resource and Exploration Technology,Yangtze University,Jingzhou434023,Hubei 3 Shenzhen Branch of CNOOC Ltd.,Guangzhou510240,Guangdong  
The traditional research approaches for sedimentary facies are affected by artificial subjective factors.For the same sedimentary structure,curve shape and seismic reflection characteristics,different people have different views.But lithologic characteristics are doubtless,and these data are easy to obtain by instrumental measurement.Therefore,the use of lithologic data to distinguish sedimentary facies,can avoid differences which are caused by artificial subjective factors in identifying sedimentary facies indicators.The well logging lithological interpretation results from the Neogene deltaic deposits of Pearl River Mouth Basin have been used to measure the thickness and layer number of these different lithology.Statistic shows that there are close relations among the single layer thickness,formation thickness rate and other characters of these strata,the variation of these characters are close related to subfacies of the deltaic deposits.The subfacies can be distinguished quantitatively by the use of these relations,such as crossplot,triangular diagram and boxplot.The critical parameters and diagrams for different subfacies have been used to recognize the facies of other wells which are not to be used to calculate the criterion.The result shows the correctness is above 75%,and the method is basically feasible that using lithological statistics to recognize deltaic subfacies.These results may provide an available approach to the quantitative study of sedimentary facies.
【Fund】: 国家科技重大专项(编号:2008ZX05023-02)资助
【CateGory Index】: P618.13
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