similar to the ratios of modern sediments deposited in anoxic-euxinic environments, suggesting moderate basin restriction during deposition. The mudstone in the lower Longmaxi Formation may be part of the globally abundant organic-rich mudstones of Early Silurian age, whose depositional mechanism have yet to be fully explored. The distribution of lithofacies in the studied interval shows an overall trend from deep water to shallow water depositional environments. We developed a detailed depositional model to interpret the evolution of depositional environments of the lower Longmaxi Formation. This study provides an example to how better characterize unconventional hydrocarbon systems through coupling of rigorous geochemical and sedimentological analysis.

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