In the Chang 7 section of upper Triassic in the Ordos Basin, hierarchical cluster analysis of the 17 selected parameters identifies 3 genetically distinct shale facies. The results of this study demonstrate the power of combined sedimentology, Geochemistry, Mineralogy and Organic Petrology analysis to improve understanding of variations in shales within a single source rock. Hierarchical cluster analysis allowed the definitive classification of 113 shale samples from the study area. The resulting facies were used as a training set to construct a geostatistic decision tree that can be used to assign (1) genetic affinities and (2) a level of confidence in the classification for any additional shale samples that become available.


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