The average δ 13 C 1 values for the studied samples show a decreasing trend in the sequence from Deng-4 Fm., Deng-2 Fm., Xixiangchi Fm., Canglangpu Fm., to Longwangmiao Fm.
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Geochemical Characteristics and Origin of Sinian-Cambrian Natural Gas in Penglai Gas Area, Sichuan Basin.
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