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Lacustrine shale from the Qingshankou Formatin of Songliao basin and the Shahejie Formation of Bohai Bay basin, and marine shale from the lower Cambrian Jiumenchong Formation of Qiannan depression were analysed by using rock pyrolysis, TOC (total organic carbon), XRD (X‐ray diffraction), SEM (scanning electron microscope), FE‐SEM (field emission scanning electron microscope), high pressure mercury...
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