Effects of CO/sub 2/ flooding on wave velocities in rocks with hydrocarbons
- Core Labs., Calgary (CA)
- Stanford Univ., Geophysics Dept., CA (US)
Compressional and shear-wave velocities were measured in the laboratory in seven sandstones (porosities ranging from 6 to 29%) and one unconsolidated sand (37% porosity) saturated with n-hexadecane (C/sub 16/H/sub 34/) both before and after CO/sub 2/ flooding. CO/sub 2/ flooding decreased compressional-wave velocities significantly, while shear-wave velocities were less affected. The magnitude of these effects was found to depend on confining and pore pressures, temperature, and porosities of the rocks. The experimental results and theoretical analysis show that the decreases in compressional-wave velocities caused by CO/sub 2/ flooding may be seismically resolvable in situ. Therefore, seismic--especially high-frequency, high-resolution seismic--methods may be useful in mapping and locating CO/sub 2/ zones, tracking movements of CO/sub 2/ fronts, and monitoring flooding processes in reservoirs undergoing CO/sub 2/ flooding.
- OSTI ID:
- 5337164
- Journal Information:
- SPE (Society of Petroleum Engineers) Reservoir Engineering; (USA), Journal Name: SPE (Society of Petroleum Engineers) Reservoir Engineering; (USA) Vol. 4:4; ISSN 0885-9248; ISSN SREEE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
ALKANES
CARBON DIOXIDE INJECTION
CHEMICAL COMPOSITION
DATA
EXPERIMENTAL DATA
FLUID INJECTION
GEOPHYSICAL SURVEYS
HEXADECANE
HYDROCARBONS
INFORMATION
MISCIBLE-PHASE DISPLACEMENT
NUMERICAL DATA
OIL SATURATION
OIL WELLS
ORGANIC COMPOUNDS
PORE PRESSURE
POROSITY
PRESSURE DEPENDENCE
RESERVOIR ROCK
ROCKS
SANDSTONES
SATURATION
SEDIMENTARY ROCKS
SEISMIC SURVEYS
SHEAR
SURVEYS
TEMPERATURE DEPENDENCE
THEORETICAL DATA
VELOCITY
WELLS