Fig. 2: History of geological evolution matches modeled geological temperatures. | Nature Communications

Fig. 2: History of geological evolution matches modeled geological temperatures.

From: High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions

Fig. 2

a The burial history and modeled reservoir temperatures (Є1l and Z2dn) in the Anyue gas field, central Sichuan Basin recovered by model simulations on well-MX and well-GS (see Supplementary Fig. 1 and Supplementary Fig. 2). The reservoirs with dolomite diagenesis have allowed storage of the pre-existing oils and subsequent oil-cracked gases30. The modeled temperatures correspond to the geological evolution history in the successive order of early cementation, surface dolomitization, syngenetic dissolution, meteoric karstification, burial dissolution, burial dolomite precipitation, hydrothermal invasion, and deepest burial dissolution30,66. b Diagram of Δ13CH3D-based temperatures (Δ18-based T) vs. C1/ΣC2-5 ratios. Dashed lines specify possible formation temperatures at which methane can be generated under different conditions21,30,34,38,39,40,41. The error bars for Δ13CH3D-based temperatures are dominantly derived from ±0.1‰ standard deviation for a constant offset against the stochastic distribution (see Supplementary Information).

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