Effective fluid factors: A physical modeling study

Abstract

In this paper, both poro-elasticity theory and pre-stack inversions have been combined to generate a flexible way for determining effective fluid factors, which is used to identify the presence of hydrocarbon saturated reservoirs in weakly anisotropic VTI reservoirs. The effective fluid factor has been derived by using approximate fluid substitution equation for anisotropic VTI medium. An anisotropic physical model has been employed to examine the effectiveness of the effective fluid factor. The fluid detection method has been applied to the inverted seismic impedance obtained from physical modeling seismic data with some known gas sands and wet sands. The interpretive resolution of seismic fluid detection has been dramatically improved by using the effective fluid factor. In addition, more information on lateral changes in fluid content can be distinguished. It was shown that this method is applicable to seismic fluid detection in weakly anisotropic VTI reservoirs.