English abstract
Block 3 & 4 are located in eastern edge of Ghaba Salt Basin. Farha south,
Shahd & Saiwan East are the three fields within these blocks that are currently
producing light oil from the Lower Paleozoic Haima super group, Neoprotrozoic
Precambrian Buah and Khuffai Formation respectively. The objective of this study is
to apply quantitative seismic interpretation for Khuffai which is the main reservoir
within Shahd. Prestack Migrated gathers have been corrected for normal moveout
to prepare them for AVO analysis, prestack inversion and quantitative reservoir
characterization. The first step of analysis and interpretation is to conduct
petrophysical and rock physics analysis to compute the associated bulk modulus and
shear modules and see how they are affected by porosity and fluid content. The
second step is to run amplitude based AVO and impedance based AVO to derive the
elastic properties from seismic.
This thesis shows that within Shahd area, Khuffai is acting as multiple zones.
The main porous zones are the first zone and the second zone. Evaluating
hydrocarbon potential within Shahd shows that the first porous zone is highly
cemented and hydrocarbon effect cannot be seen from seismic; whereas evaluating
hydrocarbon potential for the second porous zone shows that it is possible to see the
hydrocarbon effect in this zone. Also, the created volumes of acoustic impedance,
shear impedance, compressional velocity, shear velocity, Vp/Vs and density can be
used in future to characterize the reservoir and estimate the reservoir property before
drilling the well.
