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Self potential method was used to investigate the subsurface in a dumpsite and a neutral environment in Abuja campus, University of Port Harcourt, Nigeria. The self potential values ranges from -7.0 to 2.5 milliVolts within the dumpsite and 0. 1 to 9.5 miliVolts in the neutral site. The dumpsite is dominated with negative values which is attributed to electrochemical and electrokinetic processes. The electrochemical process is due to biodegradation of solid waste material which results in generation of leachate that modified the groundwater. The electrokinetic component is due to ground water flow. Positive values in the control site is due to low grasses and sand lithology. Possible direction of groundwater flow in the dumpsite is towards the stream in southwest while flow in the neutral area is toward the centre. Comparison of the two results showed that biodegradation of solid waste in the dumpsite modified the subsurface properties
The structural and sequence stratigraphy of a Niger Delta onshore field has been analysed from seismic and biostratigraphy data in order to assess the hydrocarbon potential of the area. Seven faults F1, F2, F3, F4, F5, F6 and F7 were delineated in the seismic sections. The faults, F1, F4, F6 and F7 are synthetic faults, while F2, F3 and F5 are antithetic. Two horizons H1 and H2 were identified in the seismic sections within the time window of 2200-2600 ms. The seismic sequence stratigraphy analysis revealed five sequence boundaries S1, S2, S3, S4 and S5, which represent four depositional sequences. Four maximum flooding surfaces (MFS) were also delineated in the seismic data. The analysis of the biostratigraphy data thus revealed four sequence boundaries (S1, S2, S3, S4) and three maximum surfaces (MFS1, MFS2 and MF3). The age of the sequence boundary ranges from 13.1Ma to 8.3 Ma. The age of the observed maximum flooding surfaces ranges from 12.8 Ma to 9.4 Ma. In vertical succession, the depositional sequences were identified by the order; sequence boundary, lowstand system tract (LST), Transgressive system tract (TST), Maximum flooding surface (MFS), and Highstand system tract (HST). The lowstand system tract is made up of stacking pattern of sand, while the transgressive system tract thinned into the condense section.
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