Application of Seismic Attributes to Reservoir Modelling and Characterization

Abstract

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