Carbon and oxygen isotope stratigraphy of the oxfordian carbonate rocks in Amu Darya basin

摘要: Based on the detailed research petrologic and geochemical characteristics of deposition diagenesis Oxfordian carbonate rocks in Amu Darya Basin, Turkmenistan, carbon oxygen isotopes were analyzed. The results show that paleoenvironmental evolution reflected by samples with well-preserved original coincides carbon-isotope stratigraphic curve is almost consistent global sea-level curve, Mid-Oxfordian wide transgression, positive excursion event. continuing transgression not only laid foundation for development reef shoal reservoirs Basin but also provided an example resulting reefs banks high-speed organic burial events. response diagenetic environment showed micrite limestones granular underwent weak alteration, largely retained seawater features. Dolomitization precipitation hydrothermal calcites filling solution vugs fractures before hydrocarbon accumulation occurred a closed where main controlling factor temperature, fluids from deep hot brine. chalkification after oilfield water systems.