Evaluation of and new completion recommendations for a fractured, crystalline, igneous reservoir, Texas Panhandle

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

OSTI ID:5285453

Weimer, B A; Manwaring, M S ^[1]

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1. K. P. Exploration, Inc., Oklahoma City, OK (USA)

In the Panhandle field of Texas, the lowest stratigraphic producing formation is a crystalline basement rock. The igneous rock is productive when it is naturally fractured sufficiently to hold hydrocarbons trapped in the same structure as the expansive Panhandle field. Research work to understand the crystalline reservoir better focused on the fracturing, mineralogy, and production potential of the basement interval. This trap is a true fractured reservoir; it has no more than 1% primary porosity in the nonfractured rock. The mineralogy of the host rock and fracture-filling minerals was established from drill and core samples. The host rock is a complex of granodiorite, dacite, and gabbroic diorite. Scanning electron microscopy, x-ray diffraction, and optical work confirmed the occurrence of at least 12 secondary fracture-fill minerals. Fluid inclusion analysis established formation temperatures for many of the minerals and allowed postulation of a detailed sequence of formation. The character of the fracture in differing host petrologies and the occurrence of clay minerals coating fracture surfaces were deemed to be critical factors in hydrocarbon production. New and specific enhancement treatments were designed for the subject reservoir, and these recommendations were used in a test well. Results from the test were favorable and appear to confirm the ideas formed from this work. The new recommended treatments are less expensive than current practices and indicate potential for greater ultimate recoveries of oil.

• OSTI ID: 5285453
• Report Number(s): CONF-8703189-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 71:2; Conference: American Association of Petroleum Geologists Southwest Section convention, Dallas, TX (USA), 22-24 Mar 1987; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
IGNEOUS ROCKS
PETROLEUM DEPOSITS
OIL FIELDS
RESERVOIR ROCK
TEXAS
DIORITES
GEOLOGIC FRACTURES
GEOLOGIC TRAPS
MINERALOGY
POROSITY
SCANNING ELECTRON MICROSCOPY
X-RAY DIFFRACTION
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
FEDERAL REGION VI
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
MICROSCOPY
MINERAL RESOURCES
NORTH AMERICA
PLUTONIC ROCKS
RESOURCES
ROCKS
SCATTERING
USA
020200* - Petroleum- Reserves
Geology
& Exploration