碳酸盐岩碳-硫同位素解释模型研究进展

Research Progress of Carbonate Carbon-sulfur Isotopic Interpretation Models

碳酸盐岩是一类重要的油气储层,其沉积-成岩时期的古环境条件对有机质的富集及有利储层的发育具有重要影响。碳酸盐岩碳-硫同位素体系是恢复古环境条件的一种有效手段。针对传统碳酸盐岩碳-硫同位素体系的局限性,一些新的解释模型建立起来,包括孔隙水上涌作用下的无机碳同位素组成(δ^(13)Cc_(arb)),以及同沉积黄铁矿硫同位素体系([pyrite]-δ^(34)S_(pyrite))。通过系统介绍碳-硫同位素解释模型新进展及应用,以期为古环境条件研究及油气勘探带来启示。

Carbonate is an important type of oil and gas reservoir.Paleoenvironmental conditions have a significant impact on the enrichment of organic matter and the development of beneficial reservoirs.Carbonate carbon-sulfur isotopic systematics are ef‐fective means to restore paleoenvironment.Due to limitations of traditional carbonate carbon-sulfur proxies,some new nterpretation models have been established,including the inorganic carbon isotopic compositions dominated under the upwelling effect of pore water(δ^(13)Cc_(arb))and sulfur isotopes of synsedimentary pyrite([pyrite]-δ^(34)S_(pyrite)).By systematically introducing the new progress and application of carbon sulfur isotope interpretation models,we aim to provide insights for the study of paleoenvironment and oil and gas exploration.