Abstract
ABSTRACT Rock physics analysis bridges variations in reservoir parameters (such as fluid saturation, temperature, pressure, and so on) to the changes in seismic properties of reservoir rock. By constructing a rock physics model (RPM) of saturated reservoir rock, we can make a feasibility study for time-lapse seismic surveys and an interpretation of time-lapse seismic data. However, due to the complexity of subsurface structures and reservoir conditions at each stage of oil production, no single relation can explain relationship between variations in reservoir parameters and changes in seismic properties, and thus constructing proper RPM for a given reservoir is a difficult task. This study makes an analysis on previous researches that studied the relationship to review methods of constructing RPMs. In order to suggest a proper way of making a proper model for a given situation, the review analyzes and explains four different approaches of constructing RPMs, i.e., Gassmann's model, Krief's relation, Duffy-Mindlin's model and Wyllie's time average equation. Further the review explains how we can obtain input data to the four models, which are moduli and densities of grain, fluid and dry rock. The assumptions and applications of the four RPM-constructing approaches are also discussed in detail to give an insight for a proper construction of RPMs.
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