The purpose of the study was to find and examine correlation relationships between field-scale hydraulic parameters and pore-scale geo-electrical parameter controlling groundwater occurrence in Kabatini aquifer of Upper Lake Nakuru Basin, Kenya. The study has taken under consideration priori published resistivity sounding and hydrological parameters and depth of water table from drill siteswhich is used to constrain ambiguity of interpretation. An attempt has been made to derive general functional relationships between hydraulic parameters and geo-electric property of the aquifer.The observed hydraulic data from pumping test is correlated nonlinearly with aquifer electrical resistivity. The formation resistivity factor was found vary partially with pore volume and pore surface distribution. Porosity as a function of aquifer resistivity was best defined by a negative power law function, whereas transmissivity dependence on resistivity was found to bear a positive power law. The aquifer parameters information thus obtained from resistivitysounding and pumpingtest data can be used for optimal management and assessment of groundwater resources.
The aim of the study was to assess the hydrocarbon prospectivity of the Kerio Basin in the Kenya Rift. An Isostatically corrected anomaly map produced from a Bouguer anomaly grid was filtered using a Hanning low pass filter of order 2 to remove low wavelengths. Four profiles were extracted from the grid to give 1D interpretation along straight lines. Magnetic grid was corrected for IGRF, diurnal, filtered using a 1 Hz low pass 10km Hanning filter to reduce noise, later, reduced to equator to place all anomalies directly over underlying sources and make anomalies less complicated. Tilt derivative of the magnetic grid was used to estimate depth to basement. The residual analytic signal anomaly map derived from the magnetic grid was used to capture the response of existing near surface magnetic signatures even the reversely magnetized ones.
Kerio basin is characterised by low gravity anomalies ranging between 35mGals to −100mGals related to variations in quantities of sediments deposited. Gravity profiles show that sediment thickness gradually increases to the south where we expect hydrocarbon accumulation. The magnetic anomaly map reveals low susceptibility rocks of between −20nT to −200nT to the south of the basin. Magnetic tilt depth indicates sediment thickness of 2.0-3.5Km above the basement. This corresponds to both gravity and magnetic interpretation of the same area. Integration of these data with seismic and other constraints may help gauge the hydrocarbon potential and reduce exploration uncertainty in the southern area of the Kerio Basin.
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