Bureau of Economic Geology, The University of Texas at Austin (www.beg.utexas.edu).
Symposium of Biostratigraphy of the Petroleum Exploration of Mexico, Reynosa,
Developing High-Frequency Chronostratigraphic Basinal Frameworks Using Sequence Stratigraphy Calibrated with Internationally Accepted Isotopic and Biostratigraphic Ages, Corpus Christ Region, Texas
L. Frank Brown, Jr., Robert G. Loucks, Ramón H. Treviño
Color-coded sequences, systems tracts, and bounding surfaces on S5 wireline logs can be expanded into informational benchmark charts that temporally integrate biozones, ages of sequence surfaces, depositional settings and systems, stratigraphic nomenclature, sequence frequencies, related tectonism, identification of composite well segments, petroleum pay zones, local marker horizons, and sequence stratigraphic symbols. A myriad of data sets can be compared throughout a basin using the S5 log as a chronostratigraphic benchmark reference. For example, an S5 chart can integrate stratigraphy with porosity, permeability, velocities, petrophysical cross plots, source-bed quality, petrographic data, microfossil horizons, or any information in a wireline log format.
S5 logs expedite selection of isochronous surfaces for structural mapping and chronostratigraphic units for isopach, net lithologic, log facies, or other time-stratigraphic mapping. Composite benchmark logs can display various statistical parameters from well data sets ensuring basinwide isochroneity. Comparison of S5 logs among widely spaced or isolated sites provides a framework that temporally constrains regionally diachronous lithostratigraphic units.