Petrophysical log interpretation of tight gas sands. Annual report, 1984-1985

Technical Report · Tue Oct 01 04:00:00 EDT 1985

OSTI ID:6236957

Tsay, F; Fang, J H

The correlation among the physical properties of core samples taken from the Hartselle Sandstone formation were examined. Porosity, permeability, formation factor, cementation factor, saturation exponent, clay mineralogy and cation exchange capacity were determined. A correlation of various reservoir parameters between log and cores provide useful guidelines for better understanding of logging evaluation in the Hartselle Sandstone, a tight gas reservoir in North Alabama. Thin section and x-ray diffraction analyses of the core samples show that the samples are predominantly quartz with moderate to large amount of clay matrix (mostly illite and kaolinite) and the cement materials are predominately ankerite. Cementation factor and saturation exponent values vary from bed to bed; however, values of a=0.1, m=2.28, and n=1.58 are found to be unique and acceptable for general evaluation in the Hartselle Sandstone. The cation exchange capacities (CEC) were determined by the strontium exchange technique. Gamma ray and SSP values have been correlated with the CEC measurements. Attempts have also been made to correlate the CEC to Qv, but found unsuccessful due to the anomalous low porosities. Water saturations calculated with two different models (Waxman-Smits and Dual-Water Model) gave rise to a significant disagreement. The cause(s) of the discrepancy will be investigated in the second year of this project and a new approach will be sought. 14 refs., 14 figs., 10 tabs.

• Research Organization: Alabama Univ., University (USA). School of Mines and Energy Development
• OSTI ID: 6236957
• Report Number(s): NP-6900385; ON: TI86900385
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
ALABAMA
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
CORRELATIONS
DATA
DENSITY
DIFFRACTION
DRILL CORES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
FEDERAL REGION IV
GEOLOGIC DEPOSITS
INFORMATION
ION EXCHANGE
IONS
MINERAL RESOURCES
MINERALOGY
MINERALS
NATURAL GAS DEPOSITS
NORTH AMERICA
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PHYSICAL PROPERTIES
POROSITY
QUARTZ
RESOURCES
ROCKS
SANDSTONES
SATURATION
SCATTERING
SEDIMENTARY ROCKS
SILICON COMPOUNDS
SILICON OXIDES
USA
WATER SATURATION
WELL LOGGING
X-RAY DIFFRACTION