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Garrison Field, Travis Peak Reservoirs, East Texas: Integrated Characterization and Field Production Enhancement

Amanda Suter and Volker Göbel
[email protected]

In East Texas, Garrison Field NE of Nacogdoches, the Lower Cretaceous (Neocomian) Travis Peak formation is a gas-bearing sandstone (quartzarenite, sublitharenite) unit of low permeability, low porosity, and low mud rock content. Extensive, integrated examinations of drill cuttings by microscopy (PLM), scanning electron microscopy with EDS, and X-ray diffraction (XRPD) demonstrate the abundance and usefulness of observations and data derived characterizing the lithologic units and their diagenetic developments. Samples examined enable (1) characterization on lithology, texture, and sedimentary fabric, (2) determination of mineralogy, including clay species, (3) analysis of porosity distribution and associated reservoir quality, (4) determination of possible mineralogical influences on sandstone reservoir stimulation, and (5) significance of diagenetic process sequence. Their understanding, in combination with petrophysical analyses of well logs of seven wells, well completion data and production analyses, are the basis of the evaluation of the effectiveness of hydraulic fracture treatment. The potential for future gas production from sandstone units in the Garrison Field, East Texas Basin, is evaluated in this integrated study based on recent hydraulic fracture treatment results and the set of new, integrated characteristics of the reservoir rocks. A thorough understanding of the formation's geology, production, and detailed studies of reservoir engineering properties such as permeability, porosity, and water saturation are also required and part of the characterization integration.

AAPG Search and Discovery Article #90167©2013 GCAGS and GCSSEPM 63rd Annual Convention, New Orleans, Louisiana, October 6-8, 2013