Abstract
The analysis of 3-D and time-lapse seismic data in Isomu Field has offered the dynamic characterization of the reservoir changes. The changes were analyzed using fluid substitution and seismic velocity models. The results of the initial porosity of the reservoirs was 29.50% with water saturation value of12%.The oil and gas maintained saturation values of 40% and 48% with average compressional and shear wave velocities of 2905m/s and 1634m/s respectfully. However, in fluid substitution modelling, the results reflect a change in fluid properties where average gas and oil saturation assume a new status of 34% and 24% which indicates a decrease by 14% and 16% respectively. The average water saturation increases by 30% with an average value of 42%. The decrease in hydrocarbon saturation and increase in formation water influence the porosity. Thus, porosity decreased by 4.16% which probably arose from the closure of the aspect ratio crack due to pressure increase.
Highlights
An objective approach to porosity modeling and velocity depth imaging has been a subject of contention among geophysicists
The sensitivity of porosity and velocity to changes in reservoirs fluid properties arising from hydrocarbon production has been examined using rock physics models
The porosity, gamma-ray, density, compressional, and shear wave velocity values computed from the well logs (Table 3)
Summary
An objective approach to porosity modeling and velocity depth imaging has been a subject of contention among geophysicists. Compressional velocity may travel through all materials within the earth, Quick Response Code but using it alone for depth modeling and interpretation is ambiguous, but the inclusion of shear wave data and modeling can significantly reduce the ambiguity associated with interpreting seismic data (Shillington et al, 2008). This signifies that compressional and shear wave velocities are important properties for improved local seismic event location and seismic hazard studies (Afegbua et al, 2016)
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