Heterogeneity of Paleozoic Wufeng-Longmaxi formation shale and its effects on the shale gas accumulation in the Upper Yangtze Region, China

•Heterogeneities in organic matter, porosity, permeability, minerals, laminae, and natural fracture are characterized.•Organic matter and porosity are the primary controlling factors of shale gas accumulation.•Transgressive systems tracts are more favorable for gas accumulation.•The shale gas resour...

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