Effect of brine--gas mixture on velocity in an unconsolidated sand reservoir
Conference
·
· Log Anal.; (United States)
OSTI ID:7311050
Gas in an unconsolidated sand reservoir encased in shale often results in a dramatic increase in amplitude of the seismic reflection from the shale/gas-sand interface. Unfortunately, reflection amplitude appears not to vary linearly with water (brine) saturation, and thus cannot be used to estimate gas quantity. Previously presented theoretical velocity computations, which demonstrate that compressional-wave velocity in an unconsolidated gas sand varies non-linearly with water saturation, qualitatively agree with laboratory velocity measurements on a sand specimen composed of pure quartz grains. However, significant departure of measured and theoretical velocities at high water saturation indicates that assumptions for computing compressibility of the water-gas mixture are no longer valid.
- Research Organization:
- Amoco Production Research Center, Tulsa, OK
- OSTI ID:
- 7311050
- Conference Information:
- Journal Name: Log Anal.; (United States) Journal Volume: 13:3
- Country of Publication:
- United States
- Language:
- English
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