INTEGRATING ROCK PHYSICS AND SEISMIC INVERSION FOR RESERVOIR CHARACTERIZATION IN THE GULF OF MEXICO
Oyetunji, Oyedoyin Opeoluwa 1986-
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Seismic amplitude study is a crucial aspect in reservoir characterization as it helps to analyze seismic responses before interpretation. In this study, an attempt was made to identifying the reservoirs present in the High Island field at well locations. Rock physics modeling and seismic inversion were applied in an integrated approach to study the seismic response of these reservoirs and also delineate other hydrocarbon-charged reservoirs in the field. New elastic logs were generated and subsequently used for the rock physics analyses. Rock-property models using well-log data from the study area were evaluated. These models were used in analyzing the sand and shale log response of the study area. Well-log inversion is also carried out by minimizing the difference between modeled and measured logs. The cross-plot analyses from wells successfully distinguished between fluids and lithology effect in the area, these were subsequently confirmed by AVO modeling. The result showed that lower values of Lambda-Rho, Vp/Vs ratio and impedance values correlated with areas containing hydrocarbons. Three-dimensional seismic interpretation was also carried out to provide structural and stratigraphic information of the study area; the horizons reflect structural features including faults which could serve as a trapping mechanism for hydrocarbons. The picked horizons were used to guide the interpolation of the initial model used during seismic inversion. The seismic inversion helped delineate hydrocarbon reservoirs and also aided the propagation of reservoir parameters to include areal extent of the reservoir and to see how this varies within the field.