Abstract:
Seismic and well log data was utilized to carried out seismic reservoir characterization and
modelling of “JEL” Onshore oil field Niger Delta. Lithology and hydrocarbon reservoirs were
identified from gamma ray and resistivity logs. Well log correlation was done using the principle
of similarity in log signatures across the studied wells. Computation of reservoir parameters such
as porosity, hydrocarbon saturation, water saturation and permeability was done using standard
equations. Seismic structural interpretation involved the identification and mapping of faults and
horizons from seismic sections using attributes such as amplitude and reflection geometry.
Geological modelling was carried out by integrating information from seismic and petrophysics
using geostatistical methods of Sequential Gaussian Simulation and Kriging. Volumetric
estimation of hydrocarbon was performed using probabilistic approach. The general stratigraphy
is typical of Agbada formation comprising alternation of sands and shales. Two reservoirs located
at a depth interval of 1896-2027 m were identified and mapped. Reservoir 1 has average total
porosity of 31%, effective porosity 29%, hydrocarbon saturation 85% and permeability 734 mD.
Reservoir 2 has average total porosity of 28%, effective porosity 27%, hydrocarbon saturation
75% and permeability 712 mD. A network of growth faults and two horizons were also mapped.
Seismic structural maps gave insight into rock disposition and hydrocarbon potential. The probable
structures harbouring oil and gas are a combination of faulted and fault assisted anticlinal
structures. Modelling of critical reservoir properties into maps of porosity, facies and water
saturation aided in the study of areal distribution of the parameters and influence on oil and gas
production. Finally, reservoirs 1 and 2 have 75× 106 and 46× 106 STB of oil. Both reservoirs have
oil in commercial quantities.
