Abstract
Abstract Deep sour gases are found in the Ordovician carbonate reservoir of the Tazhong Uplift in the Tarim Basin, northwest China. All sour gases in this field are dominated by gas hydrocarbons (C1–C4) with varying amounts of H2S. Most of the gases in the eastern Tazhong are characterized by high gas dryness coefficients (>0.95), 13C-enriched methane (δ13C1 ranging from −44.6‰ to −35.8‰), and small difference between values of the δ13C2 and δ13C1 (δ13C2-1). In contrast, the gases in the western Tazhong are characterized by relatively low gas dryness coefficients (mostly
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