Factors controlling organic matter accumulation in the Longmaxi Formation shale, Changning area, South Sichuan Basin
نویسندگان
چکیده
Abstract Based on total organic content (TOC) tests and major-trace element test data, this study examined matter accumulation controlling factors of the Longmaxi Formation shale in Changning area, southern Sichuan Basin. The results showed that (1) TOC Long11 submember (S 1 l ) was between 0.46% 8.35%. Vertically, revealed a ‘sandwich cake’ pattern with high concentrated 1st layers 1–1 3rd 1–3 lower 2nd 1–2 4th 1–4 ). Spatial distribution variations migration S . (2) logarithmic correlation sedimentary environment index, negative terrigenous influx, complex paleoproductivity. (3) Factors were mainly redox conditions, followed by paleoproductivity input area. When index (Babio) less than 2200 μg/g, conditions factor accumulation. On contrary, it is ultrahigh mode evolved from “preservation conditions” to “productivity–preservation synergy mode” “productivity mode”. (4) An anoxic condition basis Medium–high key These are expected contribute gas exploration development.
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ژورنال
عنوان ژورنال: Geomechanics and geophysics for geo-energy and geo-resources
سال: 2023
ISSN: ['2363-8427', '2363-8419']
DOI: https://doi.org/10.1007/s40948-023-00585-5