| For chemostratigraphy, the strata of interest are characterised by a profile of bulk-rock chemical analyses using either one or a suite of analytical techniques, as needed for the elemental and molecular components selected. Abundances of different chemical components are controlled by different mineralogical species and therefore reflect the operation of different depositional and diagenetic processes and the relative contributions of different sediment provenances. Stratigraphic variations in geochemistry can thus be useful for well correlation and for interpretation of processes controlling mineral and organic content. It is often helpful to employ statisical methods, such as multivariate regression and discriminant analysis. Chemostratigraphic variations are often reflected in wireline log responses, so results may be extrapolated to uncored locations. |
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