MINIMIZING THE UNCERTAINTIES IN DEPTH PREDICTION OFCARBONATESTRUCTUREIN CENTRAL LUCONIA PROVINCE, OFFSHORE SARA W AK

The objective of this case study is to reduce the uncertainties in depth prediction of
the target carbonate reservoir by mapping optimum interval velocities in the overlying
sequences. Lithology facies variations have very significant impact on the lateral and
vertical velocity behaviour of geologic formation. The area covering Block SK316
and SK31 0, offshore Sarawak, East Malaysia where the carbonate pinnacle structure
is the target reservoir has been chosen for the study. Five major horizons had been
identified and interpreted which are Seabed, Near Cycle VII, Near Cycle VI, Near
Cycle V and Near Cycle IV (Top of carbonate) using the seismic line vintage 1994.
Two softwares had been used in this case study which are SeisWorks, Landmark
Graphic software (for interpretation purposes) and Petrosys software (for mapping
purposes). By finding the interval velocity models for the major stratigraphic
sequences and depth structure map of the target reservoir, we can improve the depth
structure map of the carbonate pinnacle reservoir and reduce the uncertainties in
hydrocarbon volume estimation.
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