Modeling dolomitized carbonate-ramp reservoirs: A case study of the Seminole San Andres unit. Part 1 -- Petrophysical and geologic characterizations
- Univ. of Texas, Austin, TX (United States). Bureau of Economic Geology
Major issues in characterizing carbonate-ramp reservoirs include geologic framework, seismic stratigraphy, interwell heterogeneity including rock fabric facies and permeability structure, and factors affecting petrophysical properties and reservoir simulation. The Seminole San Andres unit, Gaines, County, West Texas, and the San Andres outcrop of Permian age in the Guadalupe Mountains, New Mexico, were selected for an integrated reservoir characterization to address these issues. The paper is divided into two parts. Part 1 covers petrophysical and geologic characterization, and part 2 describes seismic modeling, reservoir geostatistics, stochastic modeling, and reservoir simulation. Core data from Seminole showed that rock fabric and pore type have strong positive correlations with absolute and relative permeabilities, residual oil saturation, waterflood recovery, acoustic velocity, and Archie cementation exponent. Petrophysical models were developed to estimate total porosity, separate-vug porosity, permeability, and Archie cementation exponent from wireline logs to account for effects of rock fabric and separate-vug porosity. A model for the style of high-frequency cyclicity and the distribution of rock-fabric facies within cycles was developed using continuous outcrop exposures at Lawyer Canyon. Petrophysical properties of total and separate-vug porosities, permeability, water saturation, and rock fabrics were calculated from wireline log data. The permeability-thickness ratios among these rock fabric units can be used to approximate fluid flow and recovery efficiency.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 316256
- Journal Information:
- Geophysics, Vol. 63, Issue 6; Other Information: PBD: Nov-Dec 1998
- Country of Publication:
- United States
- Language:
- English
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Modeling dolomitized carbonate-ramp reservoirs: A case study of the Seminole San Andres unit. Part 2 -- Seismic modeling, reservoir geostatistics, and reservoir simulation