Application of Petrophysical Evaluation and Seismic Interpretation to Generate New Prospects Map of N-Field Rio Del Rey Basin, Cameroon

Abstract

The N-Field area of the Rio Del Rey Basin was interpreted on 3D seismic data, in order to provide an updated new prospects map of the area. The objective of creating the maps is to evaluate infill opportunities in N-Field. Three main horizons were picked in detail for this seismic interpretation, one in each target reservoir group (S6.1, S6.2 and S6.3) as well as two deeper horizons to ascertain the sedimentary architecture of the basin. The reservoirs and deeper sands show lateral variations in seismic response which are related to changes in reservoir properties but also to possible presence of hydrocarbons. Sedimentary features such as channels and pinch-outs can be seen on seismic, which likely act as stratigraphic traps to the east. All major faults were picked, as well as approximately five smaller, less well-defined faults and interpreted as straight normal faults, along many faults; the throw is variable, often decreasing to no visible throw at one or both ends The evaluation of the petrophysical characteristics revealed that the reservoirs are of good quality with average net to gross, porosities, water saturation and hydrocarbon saturation ranging from 0.774 to 0.980, 0.220-0.339, 0.133-0.367 and 0.633-0.867, respectively. Variation in the petrophysical parameters and the uncertainty in the reservoir structure of the three reservoirs were considered in calculating range of values of gross rock volume from generated prospects map.