Depositional Setting Structural Style and Sandstone Distribution in Three Geopressured Geothermal Areas, Texas Gulf Coast

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Winker, C. D.
Morton, Robert A.
Ewing, T. E.
Garcia, D. D.

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Three distinct areas in the Texas Gulf Coast region were investigated using well log and seismic data to assess the subsurface conditions in geopressured aquifers. These areas exhibit differences in depositional settings, structural styles, and distribution of sandstone, which influence their suitability for unconventional gas exploration and development.

The interpretation of structural and stratigraphic features primarily relied on well log correlations, with seismic data used to confirm and supplement these interpretations. Reprocessing of selected seismic sections aimed to improve signal-to-noise ratio, enhance deep reflectors, and suppress multiples. However, not all seismic lines benefited equally from reprocessing, with some lines experiencing challenges such as poor signal-to-noise ratio, statics issues, multiples, or oblique dip orientation, which degraded the seismic image quality. Migration techniques were found to be useful for fault interpretations.

In these areas, velocity variations are mainly controlled by stratigraphy, making it challenging to map the top of geopressure solely based on velocity inversion. Therefore, a comprehensive understanding of structural and stratigraphic features, combined with seismic data analysis, is essential for accurately assessing subsurface conditions and potential for unconventional gas exploration.


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