Paleoenvironment of the Lower–Middle Cambrian Evaporite Series in the Tarim Basin and Its Impact on the Organic Matter Enrichment of Shallow Water Source Rocks

Just as in deep-water sedimentary environments, productive source rocks can be developed an evaporitic platform, where claystones are interbedded with evaporites and carbonates. However, the impact of paleoenvironment on organic matter enrichment shallow water evaporite series has not been well explored. In this study, two wells central uplift Tarim Basin were systematically sampled analyzed for a basic geochemical including major elements, trace total carbon (TOC), to understand relationship between TOC paleoenvironmental parameters, such paleosalinity, redox, paleoclimate, paleo-seawater depth, paleoproductivity. The results show that Lower–Middle Cambrian mainly fluctuating salinity, weak anoxic anoxic, continuous dry hot, proper environment. interfingering section evaporites, carbonates, Awatag Fm. have higher paleoproductivity matter. Paleosalinity, jointly control series. degree first increases then decreases increase paleosalinity. All samples high content come from shallower environment