Stratigraphy and reservoir geology of San Andres dolomite, Yates field, west Texas

Conference · Sun Feb 01 04:00:00 EST 1987 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5338784

Craig, D H; Heymans, M J; Mruk, D H; Crevello, P D ^[1]

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1. Marathon Oil Co., Littleton, CO (USA)

Production from the San Andres dolomite, principal reservoir unit in the Yates field, is controlled by structure and by stratigraphic variation in depositional diagenetic facies, resulting in subdivision of the field into eastside and westside areas. In the east, the upper San Andres is dominated by peloidal, fusulinid, and algal carbonate sand and gravel shoals that were deposited as an easterly prograding platform margin sequence. Carbonate lithologies in the west Yates are typically peloidal lime mudstones and wackestones with a restricted biota of dasyclad algae and gastropods, and thin interbeds of gray-green clay shale-all deposited in intertidal and lagoonal environments. Two general porosity groups comprise most of the matrix porosity in the San Andres Formation: (1) compact or dense vuggy and moldic dolomite (west Yates), and (2) sucrosic dolomite with fine molds and fine to coarse intergrain and intercrystal pores (east Yates). Most of the reservoir storage in the San Andres of the Yates field is in sucrosic dolomite. Fractures, vugs, and caves have greatly enhanced drainage from the highly porous reservoir rock matrix and have contributed to the remarkable high productivities of many wells drilled in the field during its early history.

• OSTI ID: 5338784
• Report Number(s): CONF-8703189--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 71:2
• Country of Publication: United States
• Language: English

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