Hydrogeological controls and indicators for oil deposits in rift grabens - An example from the Upper Rhine graben, France
- Univ. of Alberta, Edmonton (Canada)
The Pechelbronn petroliferous region of northeast France is located on the west side of the Upper Rhine graben between the Vosges and Black Forest Mountains. Commercial oil occurs in Mesozoic and often Tertiary lenticular, faulted formations at various depths. In areas of oil fields and along fault zones, positive temperature anomalies at shallow and great depths (geothermal gradient: 10{degree}C/100 m), high salinities (TDS > 50,000 mg/L), and anomalously high Sr{sup {minus}}, Br{sup {minus}}, and I{sup {minus}} concentrations in shallow ground waters, flowing wells, and oil/gas seeps have been observed. These phenomena may be explained by topography-induced regionally ascending cross-formational groundwater flow. This interpretation is supported by the isotopic composition of the formation waters, suggesting a meteoric origin, relatively young {sup 14}c ages ({approx} 30,000 years), and calculated flow velocities of 0.30 m/year as well as numerical modeling. Ground-water recharges in the topographic highs, converges toward the Graben basin, and discharges under artesian conditions by vertically ascending flow, preferentially along conductive faults. Vertical migration of hydrocarons is also suggested by high methane concentrations in soils observed across faults with isotope ratios indicative of thermally mature hydrocarbon gases originating at depth. Consequently, a dynamic-genetic relationship appears to exist between basinal ground-water flow, hydrocarbon accumulations, and observed natural phenomena. This relationship may be used for hydrogeological-based exploration for hydrocarbons, complementing conventional methods.
- OSTI ID:
- 5627813
- Report Number(s):
- CONF-8809346-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 72:8; Conference: Mediterranean Basins conference and exhibition, Nice (France), 25-28 Sep 1988; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
FRANCE
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
EXPLORATION
GEOLOGIC TRAPS
GROUND WATER
HYDROLOGY
MATHEMATICAL MODELS
ORIGIN
SEDIMENTARY BASINS
TERTIARY PERIOD
CENOZOIC ERA
EUROPE
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
HYDROGEN COMPOUNDS
MINERAL RESOURCES
OXYGEN COMPOUNDS
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WESTERN EUROPE
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
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& Exploration