Evaluation of Travis Peak gas reservoirs, west margin of the East Texas Basin

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Title: Evaluation of Travis Peak gas reservoirs, west margin of the East Texas Basin
Author: Li, Yamin
Abstract: Gas production from low -permeability (tight ) gas sandstones is increasingly important in the USA as conventional gas reservoirs are being depleted , and its importance will increase worldwide in future decades . Travis Peak tight sandstones have produced gas since the 1940s . In this study , well log , 2D seismic , core , and production data were used to evaluate the geologic setting and reservoir characteristics of the Travis Peak formation . The primary objective was to assess the potential for basinward extension of Travis Peak gas production along the west margin of the East Texas Basin . Along the west margin of the East Texas Basin , southeast -trending Travis Peak sandstones belts were deposited by the Ancestral Red River fluvial -deltaic system . The sandstones are fine -grained , moderately well sorted , subangular to subrounded , quartz arenites and subarkoses ; reservoir quality decreases with depth , primarily due to diagenetic quartz overgrowths . Evaluation of drilling mud densities suggests that strata deeper than 12 ,500 ft may be overpressured . Assessment of the geothermal gradient (1 .6 ?F /100 ft ) indicates that overpressure may be relict , resulting from hydrocarbon generation by Smackover and Bossier formation potential source rocks . In the study area , Travis Peak cumulative gas production was 1 .43 trillion cubic feet from January 1 , 1961 , through December 31 , 2005 . Mean daily gas production from 923 wells was 925 ,000 cubic ft /well /day , during the best year of production . The number of Travis Peak gas wells in ?high -cost ? (tight sandstone ) fields increased from 18 in the decade 1966 -75 to 333 in the decade 1996 -2005 , when high -cost fields accounted for 33 .2 % of the Travis Peak gas production . However , 2005 gas production from high cost fields accounted for 63 .2 % of the Travis Peak total production , indicating that production from high -cost gas wells has increased markedly . Along the west margin of the East Texas Basin , hydrocarbon occurs in structural , stratigraphic , and combination traps associated with salt deformation . Downdip extension of Travis Peak production will depend on the (1 ) burial history and diagenesis , (2 ) reservoir sedimentary facies , and (3 ) structural setting . Potential Travis Peak hydrocarbon plays include : updip pinch -outs of sandstones ; sandstone pinch -outs at margins of salt -withdrawal basins ; domal traps above salt structures ; and deepwater sands .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1659
Date: 2009-05-15

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Evaluation of Travis Peak gas reservoirs, west margin of the East Texas Basin. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1659 .

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