(1985), which covers saturated and dry sands with a wide range of porosities and clay contents at different pressures. To perform the sensitivity analysis we use an empirical dataset measured by Han et al. The purpose of this study is to examine the generalized fluid method and compare this method with other fluid methods to see which indicator can most effectively discriminate between hydrocarbon sands and wet sands and which indicator is most sensitive to pore-fluid content estimation. (2003) used poroelasticity theory (Biot, 1941) to generalize several of these methods using a parameter dependent on the dry rock V P /V S ratio.
These methods use linearized approximations to the Zoeppritz equations to extract physical parameters such as P-impedance, S-impedance, density, bulk modulus, shear modulus, Lamé's parameters and Poisson's ratio, and then infer the fluid content of a hydrocarbon reservoir from these parameters.
Numerous approaches have been published that derive fluid indicators, often called direct hydrocarbon indicators (DHI), from the amplitude variations with offset (AVO) method.
