Seismic stratigraphy and petrophysical properties in Kala Field, Niger Delta

Abstract

The study focused on relationship between seismic stratigraphy and petrophysical properties of reservoirs in Kala Field, Eastern Niger Delta. Data used for this research include 3-D Seismic, well logs such as gamma-ray, resistivity, sonic, density and neutron logs to evaluate lithology, porosity, permeability and fluid saturation. This work carried out structural mapping, stratigraphic analysis, seismic facies analysis, lithologic identification, petrophysical analysis, petrophysical modelling, well to well correlation, seismic to well tie and horizon mapping using the petrel software. Based on the results, parasequences were defined for reservoirs E and F within the high stand systems tract (HST). Normal faults in the study area trend NW-SE which have been delineated on seismic. The lateral extent of these reservoirs was determined for reservoirs E and F delineated in blocks A, B and C within the Kala Field has been modelled. Petrophysical analysis results comprise porosity, permeability, net-to-gross, water saturation and stock tank oil initially in place. The average petrophysical values of reservoirs E and F in blocks A, B and C in Kala Field showed that the porosity values in block A is 25%, B is 25%, and C is 23%, permeability (291md (A), 300md (B), 1990md (C)), Net-to-Gross ratio (0.74, (A) 0.80 (B), 0.66 (C)), water saturation (45%,,39%,37%) and Stock tank oil initially in place (54.71mmstb,26.83mmstb, 15.47mmstb,) respectively. The results of the petrophysical properties suggest areas of porosity and permeability values within the reservoirs (HST), indicating they may accumulate significant hydrocarbon. This study has demonstrated the relationship between seismic stratigraphy and petrophysical properties in Kala Field.