Sensitivity analysis of changing Reservoir Saturation involving Petrophysics and Rock Physics in ‘Royal G’ field, Niger Delta

Adequate reservoir information is needed for accurate reservoir characterization towards enhancement of hydrocarbon recovery. The reservoir petrophysical parameters and elastic (seismic) properties are related to the quantity of reservoir rock fluids as well as the interaction of fluid types in the reservoirs’ pore space. Apart from the usually study of the petrophysical properties, the elastic properties are also vital because they are affected by the pore fluids interchange during hydrocarbon production or extraction. This study is aimed at examining and predicting those elastic properties that are most responsive and sensitive to changes during the fluid substitution. Information from three well logs from the ‘Royal G’ field’ situated in Niger Delta (onshore) were used for the petrophysical analysis and rock physics interpretation. The 3D crossplot outcomes were established by utilising Gassmann's fluid replacement or substitution modelling evident considering 0% oil and 80% brine (full) saturations in the reservoirs. Reservoir A and B have porosity, permeability and hydrocarbon saturation of 10–29%, 285–670 mD and 62–90% respectively. The 3D crossplot of the pseudo elastic logs give descriptive and distinct lithology and definite fluid content separation. Rock properties identified and noted to be extremely sensitive/reactive for lithology as well as fluid differentiation in the probed reservoirs are Acoustic Impedance, Density, Poisson ratio and Lambda-Rho. The outcome will generally enhance production and recovery of hydrocarbon

Terrain Conductivity Evaluation of Road Base Integrity in a Basement Complex Environment

Blanchet Adrien. La croisée d'ogives. In: Bulletin Monumental, tome 65, année 1901. p. 622

Systematic multi-technique mapping of the Southern flank of Iwaraja fault

A geophysical study of Iwaraja segment of Ifewara-Zungeru fault zone in Nigeria was conducted using remote sensing and geoelectric techniques to analyse and identify the structural elements and fractures. The Omo Forest Reserve area, Abata Egba (along Ondo-Ife highway), and Iwaraja fault zones were selected for the study. Wenner electrode profiling was undertaken at electrode separations of 10, 20 and 30 m on diplines perpendicul-ar to trend of the fault, while Schlumberger electrode configuration was adopted for vertical electrical sounding on points delineated by resistivity profiles. At Omo Forest Reserve, 3 fault signatures of falling resistivity profi-les in uniformly high resistivity environment were identified. Deep fracturing manifested in consistently decrea-sing resistivity values at large electrode separations. At Olode area, 4 signatures were identified. The profiles at Iwaraja area showed the net resistivity decreased in Western direction. The overburden materials were variably thick and underlain by bedrock that had been partially weathered and fractured, but were not infinitely resistive as usually observed in crystalline Precambrian basement complex environment. The study area was characteriz-ed by a series of faults, which were oriented in the North North East - South South West ((NNE-SSW) directio-ns, and inclined towards the East