RESISTIVITY IMAGING OF CRUDE OIL SPILL IN OGULAHA COASTAL COMMUNITY, BURUTU L.G.A, DELTA STATE, NIGERIA

A fast inversion technique for the interpretation of data from resistivity tomography surveys has been developed for operation on a microcomputer. This technique is based on the smoothness‐constrained least‐squares method and it produces a two‐dimensional subsurface model from the apparent resistivity pseudosection. In the first iteration, a homogeneous earth model is used as the starting model for which the apparent resistivity partial derivative values can be calculated analytically. For subse...

The coastal sedimentary basin of Nigeria has been the scene of three depositional cycles. The first began with a marine incursion in the middle Cretaceous and was terminated by a mild folding phase in Santonian time. The second included the growth of a proto-Niger delta during the Late Cretaceous and ended in a major Paleocene marine transgression. The third cycle, from Eocene to Recent, marked the continuous growth of the main Niger delta. A new threefold lithostratigraphic subdivision is intro...

Geophysical site characterization investigations at fuel spill sites have been generally guided by a working hypothesis which assumes that the light non-aqueous phase liquids (LNAPL) are a fully saturating phase of intrinsically very high electrical resistivity. Using observations from other related sciences, and contrary geophysical observations, a different model is developed which treats these spills as dynamic, changing systems dominated by surprisingly low resistivities. The major geophysic...

Oil spills have become a major environmental hazard constituting serious social problems in Nigeria, especially in the oil producing communities. The spills contaminate the aquifer if the subsurface layers are not protected. Geoelectric technique of geophysical investigation has been used to evaluate the protective capacity of six oil producing communities: Oleh, Olomoro, Uzere, Afiesere, Ekakpamre and Uvwiamuge in the western Niger Delta. A total of 139 vertical electrical sounding (VES) using ...

La caracterización geoeléctrica de un sitio contaminado por hidrocarburos, donde hace treinta años fue perforado un pozo petrolero, fue realizada utilizando el método de Sondeo Eléctrico Vertical (SEV) con la tecnología de Imagen de Resistividad e Interpretación 2D de los datos adquiridos. La interpretación de los datos de SEV estuvo apoyada por mediciones de resistividad en muestras de agua y suelo. Las zonas contaminadas corresponden con anomalías de baja resistividad ubicadas encima del nivel...

Field geophysical studies have identified anomalously high conductivities within and<br>below the free product zone in soils at sites with "aged" contamination by light, nonaqueous<br>phase liquids (LNAPL). Laboratory experiments and simple numerical modeling<br>studies were conducted to test the hypothesis that these anomalously high conductivities<br>result from products of LNAPL biodegradation. These experiments consisted of 20-L<br>glass vessel reactors with 18 ...

The most widespread source of pollution in Russia is the oil pollution. It occurs at all stages of oil production, transportation and processing. Outflows, proceeding during decades result to formation of oil secondary deposits.

Electrical Resistivity imaging was conducted in a crude oil spill site at Obuguru in the Forcados estuary area of the western Niger Delta with the aim of investigating the lateral and vertical spread of the hydrocarbon. Five survey profiles were laid in the study area with three of them within the polluted area to map the contaminated zone. The 2D resistivity imaging technique using the dipole- dipole array method was adopted for the survey with the aid of the SAS 4000 Terrameter. The inferred l...