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A key stratigraphic product or tool that has evolved from our current studies in the state waters of south Texas is a composite wireline log that places the lithostratigraphy of an area into a chronostratigraphic sequence framework for the specific subbasin under investigation. Named a "site-specific sequence-stratigraphic section benchmark chart," the " S5-benchmark chart " is a key point of reference for integrating all available sedimentary information in a site-specific area or subbasin. For example, lithofacies, sequences, systems tracts, stratigraphic surfaces, relative sea-level cycles, biozones, petrophysics, and age data can be placed in chronostratigraphic context and correlated basinwide. S5-benchmark charts are composites of wireline-log sections of several key wells spliced to display the most complete stratigraphic succession. Consequently, the S5-benchmark chart captures the record of maximum depositional history and cyclicity recorded in the rocks of a particular basin or subbasin.

S5-benchmark charts do not represent a major jump in stratigraphic interpretation. The charts do, however, offer a method of integrating different kinds of basin information within a lithogenetic and chronostratigraphic framework. Consequently, preparation of such charts requires a thorough analysis of sequences, depositional systems, and their application in constructing sequential paleogeographic time slices, with or without complementary seismic information. Reference to an S5-benchmark chart permits selection of key isochronous surfaces and stratigraphic intervals for precise mapping and reconstruction of lithogenetic and structural history. Any data set, for example the parameters of a hydrocarbon system, can be extrapolated throughout a basin within a precise isochronous context. Finally, cycles, systems tracts, unconformities and maximum-flooding surfaces composing a stratigraphic succession can be readily correlated in geologic time with those of other areas.