Application of Seismic Attributes to Reservoir Modelling and Characterization

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Juliet Emudianughe


Reservoirs are modelled to reveal geological features especially structural traps on hydrocarbon prospects in a given
field. Seismic attribute is applied to model the Tomboy field reservoir to indicate prospective drilling locations where
there is high net to gross value in the field. Structures were mapped using seismic methodology and determine
environment of deposition using well logs. Major strata terminations such as on-laps, erosional unconformities were
recognized. Well logs were effectively tied to seismic lines to ensure effective seismic interpretation. Sandstone
depicts negative amplitude while shale depicts positive amplitude. Four horizons were mapped and the mapped
horizons were converted into surfaces. The generated surfaces were also used in locating the Maximum Flooding
Surfaces in the depositional environment of the lithology and a zone which is term “Area of Complex Geology”. The
structural style of field is characterized by systems of normal faults, listric faults, horst faults and growth faults.
Three wells from the Tomboy Field (TMB-2, TMB-5 and TMB-7) were correlated and there was continuity in the
progression of the lithology. The seismic attributes showed the effect of time and amplitude on reservoir modelling
which is affected by porosity and lithology. Seismic attributes within the framework of this research was used to
provide good information about the mapped reservoirs and identified structural traps towards a better delineation of
hydrocarbon prospects and improved reservoir modelling via fault and horizon models

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