Reservoir description, Walker Creek field, Arkansas

Conference · Tue May 01 00:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:6762864

Bliefnick, D M; Frey, K M; Dang, Thu-Thuy ^[1]; Bissmeyer, S M ^[2]

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1. ARCO Oil and Gas Co., Plano, TX (USA)
2. ARCO Oil and Gas Co., Lafayette, LA (USA)

A multidisciplinary reservoir description of Walker Creek field in southern Arkansas was conducted to evaluate the field's potential and determine the best method of increasing recovery. The reservoir is within a 100-ft-thick section of the ooid grainstone facies of the Jurassic Smackover Formation. The reservoir is currently under partial pressure maintenance by reinjection of produced gas at the crest of the structure. One of the goals of the study was to evaluate reservoir management options for effecting significant incremental oil recovery. The reservoir was originally divided into five producing zones (1-5). Of these, zones 2 and 4 account for nearly 95% of the production. The grainstone facies in zones 2 and 4 consist predominantly of ooids, but also contain peloids, oncolites, and intraclasts. Calcite cement creates discontinuous tight streaks throughout the reservoir. Porosity is predominantly intergranular and ranges from 1% to greater than 20%. Permeability also varies widely, ranging from 0.1 to > 5000 md. Five percent porosity and 0.6 md permeability, as determined by log analysis, were used as a net pay cutoff. Data from lithologic and log analyses were used to construct cross sections across the field. These sections and grainstone isopach maps illustrate that the two main reservoir zones represent two generations of prograding ooid shoal development. Calcite cemented intervals within the zones cannot be correlated beyond two or three wells. The local extent of these intervals does not justify using them to further subdivide the reservoir zones. Gross pay, net pay, and {delta}h maps indicate that development of porosity followed the trend and distribution of the ooid shoals. Production data (pressure plots, gas-to-oil-ratio maps, and tracer studies) suggest that individual reservoir zones are in communication across the field. These results led to a decision against infill drilling in the field.

• OSTI ID: 6762864
• Report Number(s): CONF-900605-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 74:5; Conference: Annual convention and exposition of the American Association of Petroleum Geologists, San Francisco, CA (USA), 3-6 Jun 1990; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
58 GEOSCIENCES
ARKANSAS
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
RESERVOIR ROCK
CARBONATE ROCKS
DIAGENESIS
MAPPING
PERMEABILITY
POROSITY
RESERVOIR PRESSURE
FEDERAL REGION VI
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NORTH AMERICA
RESOURCES
ROCKS
SEDIMENTARY ROCKS
USA
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration
580000 - Geosciences