Carbonate Reservoir Description Using Poststack
Seismic Inversion, Onshore
Ben Flack*, Azza Halit-Robinson, Richard Salter, Niranjan Banik and Randy Utech, Reservoir Services, WesternGeco, Houston, Texas
A robust poststack
inversion method has been successfully applied to a recently acquired seismic
survey, to predict seismic reservoir porosity within the Jurassic Smackover
Five key wells were edited for geophysical purposes and used for quantitative wavelet estimation throughout the seismic volume. A proprietary workflow was used to broaden the seismic bandwidth and ensure a true zero-phase output. Seismic acoustic impedance was calculated independently of well control and resulted in a high-resolution dataset capable of detailed stratigraphic analysis and more accurate gross interpretation for low-frequency compensation and mapping. Well logs were used to calculate an absolute acoustic impedance volume that - through petrophysical calibration - was converted to porosity. “Blind-well-testing” the seismic porosity volume against well logs not used within the processing steps showed good ties.
Porosity maps were generated and used in conjunction with seismic porosity sections to better define, and quantify existing fields and new prospects.
Ben Flack received his Bachelor
of Science degree in Geology from the University of
Liverpool, England in 2000. He gained
his Master of Science degree in Petroleum Geology from