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化学地层学(Chemostratigraphy)是根据物质化学性质的规律性变化来研究地层的一种边缘地层学研究方法。在传统的岩石地层学、生物地层学应用受到极大限制的条件下,如对前寒武系地层、“哑地层”、不同沉积相区之间地层的划分与对比,或仅有少数钻井地层资料时,化学地层学有可能成为远距离、大区域之间海相地层精确划分、对比的工具。岩层中的化学元素(包括常量、微量、稀有元素和有机元素)及稳定同位素组成,虽然可能受到沉积时期海水循环、大气与气候、有机碳产率及成岩过程
Chemostratigraphy is a method of studying stratigraphic stratigraphy based on the regular changes of chemical properties of materials. In the traditional lithostratigraphy, the application of bio-stratigraphy has been greatly restricted, such as the Precambrian strata, “dumb strata”, stratigraphic division and contrast between different sedimentary facies, or only a few drilling strata Data, chemical stratigraphy may become a long-range, large area of marine strata accurate division, comparison tool. Chemical elements (including constants, trace elements, rare elements and organic elements) and stable isotopic compositions in the rocks may be affected by seawater circulation, atmospheric and climatic conditions, organic carbon yield and diagenetic processes during deposition