Geological and engineering characterization of a fracture-modified Grainstone reservoir
The Taylor-Link West San Andres field is located on the southern margin of the Central Basin Platform, flanking the deep Sheffield channel to the south. Of the 47 million bbl of original oil in place, 10.5 million bbl were recovered during primary production; a secondary (waterflood) program was initiated recently. The 100-ft oil column in this field is contained within a north-trending high-energy grainstone shoal complex capping an upward-shallowing succession of outer-ramp fusulinid wackestones and mollusk-crinoid wackestones. Complicating the relatively simple facies setting of the reservoir is a superimposed karst profile developed during pre-Grayburg exposure of the southern margin of the Central Basin platform. Interparticle porosity in the grainstone is typified by 20-50-md permeability, whereas short, wide-aperture fractures are a second pore type with permeability between 100 and 2,000 md. Local zones of microhombic dolomite porosity believed associated with the karst development also contribute to the pore system. Most injected water is cycled through fractures, leaving the majority of unswept oil in matrix (interparticle) pore space. Mapping of matrix permeability was accomplished by establishing petrophysical relationships with data from core plugs rather than whole core in order to avoid the contribution of permeability from fractures. These data, combined with fracture analysis of cores, may aid planning of profile modification for improved contact of injected water with matrix porosity and remaining mobile oil.
- OSTI ID:
- 6503594
- Report Number(s):
- CONF-880301-
- Resource Relation:
- Conference: Annual meeting of the American Association of Petroleum Geologists, Houston, TX, USA, 20 Mar 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FRACTURED RESERVOIRS
HYDRAULIC CONDUCTIVITY
PETROLEUM DEPOSITS
GEOPHYSICS
TEXAS
ENHANCED RECOVERY
MICROSTRUCTURE
OIL WELLS
PERMEABILITY
PETROLEUM
PETROLEUM GEOLOGY
POROSITY
RESERVOIR ROCK
SANDSTONES
WATERFLOODING
WELL STIMULATION
CRYSTAL STRUCTURE
ENERGY SOURCES
FEDERAL REGION VI
FLUID INJECTION
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GEOLOGY
MINERAL RESOURCES
NORTH AMERICA
RECOVERY
RESOURCES
ROCKS
SEDIMENTARY ROCKS
STIMULATION
USA
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
020300 - Petroleum- Drilling & Production