The role of active and ancient geothermal systems in evolution of Grant Canyon oil field, Railroad Valley, Nye County, Nevada
- Univ. of Utah Research Inst., Salt Lake City (United States)
- Terra Tek, Inc., Salt Lake City, UT (United States)
Since discovery in 1983, the Grant Canyon field has been among the most prolific oil producers (on a per-well basis) in the US. Production through June 1990 was 12,935,630 bbl of oil, principally from two wells which in tandem have consistently yielded more than 6,000 bbl of oil per day. The field is hosted by highly porous Devonian dolomite breccia loosely cemented with hydrothermal quartz. Results of fluid-inclusion and petrographic research in progress at Grant Canyon suggest that paleogeothermal and perhaps currently circulating geothermal systems may have played a major role in oil-reservoir evolution. For example, as previously reported, the breccia-cementing quartz hosts primary aqueous, aqueous/oil, and oil fluid inclusions which were trapped at about 120C (average homogenization temperature) and document initial oil migration and entrapment as droplets or globules dispersed in dilute (< 2.2 wt.% equivalent NaCl) aqueous solutions. Additional evidence of geothermal connection is that the horst-block trap at Grant Canyon is top and side sealed by valley-fill clastic and volcanic rocks which are locally hydrothermally altered and calcite flooded. These secondary seals are enhanced by disseminated, solid asphaltic residues locally accounting for 23% (volume) of the rock. Current reservoir temperatures at Grant Canyon (120C) and the adjacent Bacon Flat field (171C) attest to vigorous contemporary geothermal activity. Based on results of the authors' Grant Canyon work to date, they suggest that active and paleohydrothermal systems could be viable petroleum exploration targets in otherwise favorable terrain elsewhere in the Basin and Range.
- OSTI ID:
- 6249037
- Report Number(s):
- CONF-9107109-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:6; Conference: American Association of Petroleum Geologists (AAPG) Rocky Mountain Section meeting, Billings, MT (United States), 28-31 Jul 1991; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
Similar Records
Assessing the role of ancient and active geothermal systems in oil-reservoir evolution in the eastern Basin and Range province, western USA. Annual progress report, June 1, 1992--May 31, 1993
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Related Subjects
15 GEOTHERMAL ENERGY
NEVADA
HYDROTHERMAL SYSTEMS
PETROLEUM DEPOSITS
GEOLOGIC TRAPS
RESERVOIR ROCK
HYDROTHERMAL ALTERATION
DEVONIAN PERIOD
DOLOMITE
EXPLORATION
MIGRATION
OIL FIELDS
PETROGRAPHY
PETROLEUM GEOLOGY
POROSITY
CARBONATE MINERALS
DEVELOPED COUNTRIES
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GEOTHERMAL SYSTEMS
MINERAL RESOURCES
MINERALS
NORTH AMERICA
PALEOZOIC ERA
RESOURCES
USA
020200* - Petroleum- Reserves
Geology
& Exploration
150200 - Geology & Hydrology of Geothermal Systems