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Fluid properties (Density (Rocks with higher density oils (High…
Fluid properties
Density
High density oil
High bulk moduli (lower compressibilities)
Rocks with higher density oils
High compressional properties and shear impedance
Low Vs
Viscosity
High viscous oil
High seismic properties
Gas-oil and gas-water ratios
Larger amount of dissolved gas in an oil, low bulk modulus
Rocks saturated with high GOR oils
Low compressional seismic properties
Wettability
Interfacial forces
Attractive between the wetting fluid and solid surface
Repulsive between nonwetting fluid and solid surface
Rock fully saturated with nonwetting fluid
High seismic properties
Fluid composition and type
Heavier oil (high carbon-number HC) = high bulk moduli
Rock saturated with heavier oils
High compressional properties
Bulk modulus (high to low)
Fresh water
Oil
Gas
Low salinity brine
High salinity brine
Saturation
Full saturation of a liquid in a rock
High compressional seismic properties and shear impedance
Low Vs
High Vp/Vs
Magnitude of saturation effect is higher in rocks with weak frames/flat pores
Fluid phase
Rocks saturated with fluids in gaseous phase
C02 gas
Steam
HC gas
Low compressional seismic properties and shear impedance
Slightly higher Vs
Due to the fluid's higher compressibility and low bulk density
Low Vp/Vs