EEI INVERSION TECHNIQUE TO DETERMINE FLUID TYPES AND SAND GEOMETRY IN MATURE FIELD STUDY CASE: 'G SAND RESERVOIR' IN THE NORTHERN MUTIARA

摘要

The seismic response to hydrocarbons has long been recognized as a potential means of directly predicting petrophysical and fluid properties in the subsurface. An integrated workflow that draws on the latest development in pre-stack seismic inversion, incorporating Extended Elastic Impedance (EEI), Lambda(λ)-Mu(μ)-Rho(ρ) (LMR), inversions and multi-variables log decomposition, allows better distinction between seismic anomalies caused by lithology and those caused by hydrocarbons. By creating relationships between these inversion attributes and logged petrophysical properties it is possible to delineate the reservoirs geometry, identify the hydrocarbon content. This method has been successfully applied to support the drilling campaign in North Mutiara. G3180 and 13300 sand and fluid distributions are defined using EEI methods and proved with 2 new wells.