Fluid Detection by Spectral Decomposition – Lessons from Numerical, Physical Modelling and Field Studies

摘要

This paper investigates the use of spectral decomposition techniques to detect fluid saturation through studies on field data, physical modelling data and numerical modelling. The main mechanisms which control the spectral response are fluid-sensitive tuning, together with attenuation and dispersion for eflected waves. In many cases the direct transmission loss due to attenuation is less useful as a ydrocarbon indicator and may be ignored. In our examples, numerical modelling of the reflection response is able to predict the spectral response to changing fluid which is seen in the field and physical modelling data. Consequently we argue that with careful modelling it may be possible to interpret the spectral response in terms of fluid type.