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--- seqstrat_importance [29/05/2023 14:40] – mike_gss
+++ seqstrat_importance [29/05/2023 14:59] (current) – mike_gss
@@ Line 16: / Line 16: @@
 //Schematic view of a sequence in a clastic environment. The figure at the top is drawn according to rock thickness. Sediments are grouped together in packages (“systems tracts”) deposited during phases of sea-level cyclicity, separated by different sequence surfaces. The lower image shows the same packages and surfaces, this time drawn according to the (upwards) passage of time. Such images form the basis for Chronostratigraphic Charts.//
-The predictive
+The **//predictive power//** of sequence stratigraphy enables sedimentary packages to be correlated between sections in terms of their position within a typical cycle of sea level fall and rise. It therefore becomes possible to predict what //likely// sediments are to be found outside areas of data control:
+{{:seqstrat10.jpg?nolink|}}
+//Facies from separate lateral sections (upper image: green - organic rich deep water sediments; dark brown - deep water fine clastics; light brown - shallow water fine clastics; yellow - shallow water coarse clastics) can be interpreted in terms of "systems tracts" and can in turn be correlated by the sequence surfaces which separate them vertically. In practice the surfaces are usually identified and correlated first with the systems tracts interpreted between them. We can use sequence stratigraphic models to predict what sorts of facies in the same systems tracts (which can also include the deposition of no facies at all) might occur in areas between data points (lower image). Such diagrams (below) are called **Chronostratigraphic Charts** which form the basis for regional screening and play identification.//
+{{:seqstrat11.jpg?nolink|}}