Reservoir geology of Devonian carbonates and chert: Implications for tertiary recovery, Dollarhide field, Andrews County, Texas

Journal Article · Tue Jan 01 00:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7171328

Saller, A H; Miller, J A ^[1]; Horn, D V ^[2]; Guy, B T ^[3]

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1. Unocal Science and Tech., Brea, CA (United States)
2. Unocal Oil and Gas, Farmington, NM (United States)
3. Unocal Oil and Gas, Midland, TX (United States)

Devonian strata of the Thirtyone Formation at Dollarhide field, Andrews County, Texas, originally contained 144 million bbl of oil in place, with 18.6 million bbl produced by primary recovery, 39.3 million bbl projected to be produced by secondary recovery (waterflood), and 27.4 million bbl projected to be produced by tertiary recovery (CO{sub 2} flood). Devonian strata contain five main lithologies (from bottom to top): (1) carbonate-chert mudstone; (2) burrowed chert-dolomite; (3) laminated tripolitic chert; (4) bioclastic limestone; and (5) upper dolomite. Deposition of the 180-ft-thick (55 m) reservoir section occurred during a basinward progradation of shelf and slope facies. Porosity within Devonian strata is controlled mainly by depositional facies. The upper porosity zone (0-90 ft or 0-27 m thick) is within the upper dolomite and is heterogeneous, with stratified porosity that bifurcates, coalesces, and pinches out in several different intervals. The relative homogeneity and moderate permeability of the lower reservoir should help achieve a uniform sweep during CO{sub 2} flooding. Higher permeabilities near the base of the lower reservoir should minimize CO{sub 2} override, thereby improving sweep efficiency. the thinner, more heterogeneous, less continuous, more stratified, more permeable pay in the upper reservoir will result in more rapid and less uniform CO{sub 2} sweep.

• OSTI ID: 7171328
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:1; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
OIL WELLS
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WATERFLOODING
RESERVOIR ROCK
PERMEABILITY
POROSITY
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CARBONATE ROCKS
CHERT
ENHANCED RECOVERY
PETROLEUM GEOLOGY
SWEEP EFFICIENCY
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DEVELOPED COUNTRIES
FEDERAL REGION VI
FLUID INJECTION
GEOLOGIC DEPOSITS
GEOLOGY
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MISCIBLE-PHASE DISPLACEMENT
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WELLS
020200* - Petroleum- Reserves
Geology
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020300 - Petroleum- Drilling & Production