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- W2024556904 abstract "The Smackover Formation in central Mississippi is sour gas productive from siliciclastics interbedded with tight carbonates. The sandstones have low reservoir quality (porosity and permeability of 7.0% and 0.35 md, respectively), but wells are capable of producing at high rates and with large volumes because of the extremely large geopressures and locally thick continuous sandstone packages. Production is from a hostile subsurface environment which includes high temperatures (>365{degree}F), high pressures (>0.88 psi/ft), great depths (>20,000 ft), and variable and corrosive sour gas mixtures (CH{sub 4} = 55%, H{sub 2}S = 36%, CO{sub 2} = 9%). Five fields are productive in this trend; Thomasville, the largest field, is used to illustrate the depositional and diagenetic controls on productivity. Deposition occurred as an upward-shoaling sequence of outer ramp to nearshore and sabkha environments. The lower sandstones are bioturbated, low-quality reservoirs interbedded with carbonate mudstones and packstones; the middle interval consists of the thickest and most continuous sandstones that are interpreted to be amalgamated inner-ramp shoal and ridge deposits; the upper interval consists of the common but tight Smackover ooid grainstone shoals that are interbedded with continuous but thin shoal and shoreface sandstone. The middle interval has the best reservoir quality and contains more » 75% of the hydrocarbons. Seismic may be used to map the sandstone packages but not the individual sandstones. In addition to the larger net/gross and more continuous sandstones in the middle zone, two postdepositional controls also govern the reservoir quality. These include small-scale faulting but more importantly diagenetic events which strongly overprint but do not obscure the original depositional control. At least 15 different diagenetic events have occurred in the sour gas fields that have generally decreased reservoir quality. « less" @default.
- W2024556904 created "2016-06-24" @default.
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- W2024556904 date "1990-01-01" @default.
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- W2024556904 title "Depositional and Diagenetic Controls on Reservoir Quality and Gas Composition in a Mixed Siliciclastic/Carbonate Setting, Thomasville Field, Mississippi: ABSTRACT" @default.
- W2024556904 doi "https://doi.org/10.1306/44b4bb62-170a-11d7-8645000102c1865d" @default.
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