Geologic model of San Andres reservoir, Roberts Unit CO sub 2 Phase III area, Wasson field, Yoakum County, Texas

Conference · Wed Apr 01 00:00:00 EST 1992 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7153030

Bent, Jr, J V ^[1]

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1. Texaco Inc., Midland, TX (United States)

Roberts unit is a mature San Andres waterflood project located in Wasson field, Yoakum County, Texas. Texaco, as operator, has evaluated the reservoir for CO{sub 2} flooding, and a four-phased CO{sub 2} project has been designed for the unit. A critical aspect of CO{sub 2} flood design is the development of geologic reservoir management, such as flood monitoring and evaluation of infill drilling. The geologic reservoir model established for the southeastern part of the unit (the CO{sub 2} Phase III area) is an example of this design. The reservoir consists of stacked carbonate depositional sequences. The cyclic nature of these depositional sequences is reflected in both core-defined lithofacies and porosity log character. Sequences consist of basal mudstones, restricted-shelf skeletal wackestones, open-shelf skeletal wackestones and packstones, solution and brecciated zones, and peloidal packstone caps. Intertidal mudstones and wackestones occur at the top of the reservoir and in the overlying reservoir seal. Porosity distribution is controlled by diagenetic events, but these events are closely related to depositional facies. Reservoir geometry and reservoir quality are interpreted from study of carbonate lithofacies, porosity and permeability relationships, and injection characteristics. Depositional sequences are subdivided into layers (flow units) for use in reservoir simulation. Log normalization, core description, porosity interpretation, reservoir mapping, three-dimensional modeling, and joint effort between project geologists and engineers contributed to development of the reservoir model.

• OSTI ID: 7153030
• Report Number(s): CONF-9204139-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 76:4; Conference: American Association of Petroleum Geologists (AAPG) Southwest section meeting, Midland, TX (United States), 21-24 Apr 1992; ISSN 0149-1423
• Country of Publication: United States
• Language: English

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02 PETROLEUM
OIL WELLS
CARBON DIOXIDE INJECTION
PETROLEUM DEPOSITS
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CARBONATE ROCKS
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LITHOLOGY
PERMEABILITY
POROSITY
RESERVOIR ENGINEERING
RESERVOIR ROCK
STRATIGRAPHY
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DEVELOPED COUNTRIES
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FLUID INJECTION
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WELLS
020200* - Petroleum- Reserves
Geology
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020300 - Petroleum- Drilling & Production