Application of Resistivity Sounding in the Exploration for Nigerian Tarsand

Ako, Bankole D.; Alabi, A. O.; Adegoke, Oluwafeyisola S.; Enu, E. I.

doi:10.1177/014459878300200207

Cited by 13 publications

(10 citation statements)

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“…Bitumen is also referred to as heavy oil and it constitutes an important energy resource. It is highly viscous oil with API < 20°C and it is regarded as the biogenic product of crude oil found in the sedimentary environment [2].…”

Section: Introductionmentioning

confidence: 99%

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Delineation of Bitumen Saturated Zones in Agbabu, Southwestern Nigeria, Using an Integrated Geophysical Methods

Adigun¹

2020

JENR

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Delineation of bitumen saturated zones in Agbabu, southwestern Nigeria was carried out using an integrated geophysical methods involving the groundmagnetic and electrical resistivity methods. A total of four magnetic traverses were established in the East-west direction, each covering a total length of 130m. The groundmagnetic results revealed geologic structures favourable to accumulation of bitumen and its occurrence at near-surface. It was also revealed that the bituminous zone trend in the East-West direction of the study area. Two techniques was adopted under electrical resistivity method, the horizontal electrica profiling (HEP) and the vertical electrical sounding (VES). The HEP was used to measure the subsurface electrical variations and lateral extent of bitumen over the study area. Four traverses were established in the North-South direction for HEP and were used to generate electrical profiling curves, which showed low resistivity signatures over the study area. The low resistivity signatures were attributed to the intrusion of saline water to the bituminous zones. Two vertical electrical soundings (VES) were carried out, VES1 and VES2 which were carried out on traverse 1 and traverse 3 had five and six geologic layers respectively. The bitumen saturated zones were found to be within layers three and four and underlained by saline water. The average depth to the bitumen saturated zones was found to be between 3.1m and 23.3m downwards. The near-surface occurrence of natural bitumen and the intrusion of saline water might hinder the feasibility of pure and quality water from the shallow hand-dug wells within the study area.

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Section: Introductionmentioning

confidence: 99%

“…In Nigeria, various authors have employed electrical methods in the exploration of heavy oil [2,8,12]. Also magnetic method has equally been used [16].…”

Section: Introductionmentioning

confidence: 99%

Delineation of Bitumen Saturated Zones in Agbabu, Southwestern Nigeria, Using an Integrated Geophysical Methods

Adigun¹

2020

JENR

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“…The origin of the bitumen has been discussed (Coker 1990;Ekweozor 1986). Other relevant studies on the deposit and geology of the basin include works done by (Ako et al 1983;Ekweozor 1986Ekweozor , 1990Nwachukwu and Ekweozor 1989;Enu 1987Enu , 1990Enu and Adegoke 1984;Elueze and Nton 2004;Akinmosin et al 2005Akinmosin et al , 2013Akinmosin and Osinowo 2008). Enu (1985) distinguished two horizons: X (shallow) and Y (deeper than 50 m).…”

Section: Introductionmentioning

confidence: 99%

Reservoir geology and effects on exploitation of natural bitumen deposits (Nigerian deposits as a case study)

Akinmosin

Bankole

Eyogwe

2018

J Petrol Explor Prod Technol

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Geological investigation have led to discovery of huge tar sand deposits within Afowo Formation of the Turonian-Maastrichtianage (95.9-66.0 Ma) in the Nigerian sector of the Eastern Dahomey Basin. This study aims at determining the feasibility of exploiting the major hydrocarbon resource steam assisted gravity drainage enhanced recovery technique. Samples from three core holes were dry sievied to determine the particle size distribution and their sections studied using a petrographic microscope. Clay mineral content was determined using X-ray diffraction scanning electron microscopy. The granulometric analysis shows the bituminous sediments to be generally fine grained and moderate to well sorted, and the grains are angular to subangular. Porosity ranges from 15.5 to 33.6 ɸ with average value of 26.4 ɸ, while permeability ranges from 270 to 4800 mD, with an average value of 4800 mD (very high) recorded for the sandstones. Petrographic study, scanning electron microscopy and X-ray diffractometry showed quartz as the dominant mineral component, with subordinate feldspar and other accessory minerals. The predominance of quartz is probably due to its mechanical stability. The low frequency of feldspar is attributable to its susceptibility to chemical breakdown and alteration, respectively, during transport and after deposition, with latter accounting for the observed secondary porosity. Kaolinite is the common clay mineral present in the oil sands and may not have sufficiently reduced the reservoir quality to negatively impacting enhanced recovery operation by steam assisted gravity drainage.

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“…The origin of the bitumen has been considered (Coker, 1982;Ekweozor, 1985). Other relevant studies on the deposit include works done by Ako et. al (1983); Ekweozor (1986 and; Ekweozor and Nwachukwu (1989); Enu (1987Enu ( , 1990; Enu and Adegoke (1984).…”

Section: Introductionmentioning

confidence: 99%

Article size distribution and control on Bitumen saturation of some Tar Sand Deposits in parts of South-Western Nigeria

Akinmosin¹,

Oredein²,

Osinowo³

et al. 2008

Glo Jnl Pure Appl Sci

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Sedimentological analysis of some Afowo oil sands was carried out with the aim of characterising the reservoirs vis-à-vis their bitumen saturation and recovery efficiencies. Fourty-four samples of tar sands of the Afowo formation (collected at three different localities namely; Idiobilayo, Idiopopo and Igbotako) were subjected to granulometric and petrological analyses to determine the particle size distribution as well as other textural characteristics. The bitumen saturation analysis was carried out with the use of toluene. The result of sedimentological and particle size distribution studies showed that the sands are medium grained, moderately sorted and mesokurtic. The grain morphology can be described as having low to high sphericity, with shapes generally sub-angular to subrounded indicating a fairly long period of transportation. The result of bitumen saturation analysis showed that both Idiobilayo and Idiopopo oil sands have an average oil saturation of 17.2% and 16.9% respectively, while Igbotako sands have an average oil saturation of 12.3%. Consequently, Idiobilayo and Idiopopo oil sands deposits are therefore expected to have better reservoir quantities and possibly good oil recovery efficiencies.

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Application of Resistivity Sounding in the Exploration for Nigerian Tarsand

Cited by 13 publications

References 0 publications

Delineation of Bitumen Saturated Zones in Agbabu, Southwestern Nigeria, Using an Integrated Geophysical Methods

Delineation of Bitumen Saturated Zones in Agbabu, Southwestern Nigeria, Using an Integrated Geophysical Methods

Reservoir geology and effects on exploitation of natural bitumen deposits (Nigerian deposits as a case study)

Article size distribution and control on Bitumen saturation of some Tar Sand Deposits in parts of South-Western Nigeria

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