A preliminary analysis of regional groundwater movement in the Niger Delta, Nigeria

Research output: Contribution to journalArticle

Abstract

A preliminary analysis of regional groundwater movement has been done for the Niger Delta, Nigeria. The Niger Delta covers an area of about 75,000 km2 in southern Nigeria. The Delta is underlain by clastic Tertiary sediments, from top to bottom: the Benin, Agbada, and Akata Formations. The Delta is one of the most hydrocarbon rich regions in the world, where petroleum has been produced from the Agbada Formation by several oil companies. Oil and gas production has resulted in environmental degradation of the delta. In this study, a preliminary analysis of groundwater movement in the delta is performed to determine groundwater flow pathways, discharge and recharge areas, and average residence time of water movement through the flow systems. The USGS three-dimensional finite-difference code, MODFLOW, was used to simulate steady-state flow. No regional flow system occurred, and flow was concentrated in intermediate and local systems. A major discharge area was found that collects water from local flow systems in the coastal plains and from intermediate systems that originate from the mid topographic elevations. The depth to length ratio of the Niger Delta, its low regional slope, and its significantly undulating surface relief make the delta a hydrogeologically shallow basin.

Original languageEnglish
Pages (from-to)125-144
Number of pages20
JournalJournal of Environmental Systems
Volume32
Issue number2
DOIs
StatePublished - 1 Jan 2005

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groundwater
analysis
environmental degradation
gas production
coastal plain
oil production
groundwater flow
residence time
recharge
relief
petroleum
hydrocarbon
water
oil
basin
sediment

Cite this

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abstract = "A preliminary analysis of regional groundwater movement has been done for the Niger Delta, Nigeria. The Niger Delta covers an area of about 75,000 km2 in southern Nigeria. The Delta is underlain by clastic Tertiary sediments, from top to bottom: the Benin, Agbada, and Akata Formations. The Delta is one of the most hydrocarbon rich regions in the world, where petroleum has been produced from the Agbada Formation by several oil companies. Oil and gas production has resulted in environmental degradation of the delta. In this study, a preliminary analysis of groundwater movement in the delta is performed to determine groundwater flow pathways, discharge and recharge areas, and average residence time of water movement through the flow systems. The USGS three-dimensional finite-difference code, MODFLOW, was used to simulate steady-state flow. No regional flow system occurred, and flow was concentrated in intermediate and local systems. A major discharge area was found that collects water from local flow systems in the coastal plains and from intermediate systems that originate from the mid topographic elevations. The depth to length ratio of the Niger Delta, its low regional slope, and its significantly undulating surface relief make the delta a hydrogeologically shallow basin.",
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A preliminary analysis of regional groundwater movement in the Niger Delta, Nigeria. / Ophori, Duke.

In: Journal of Environmental Systems, Vol. 32, No. 2, 01.01.2005, p. 125-144.

Research output: Contribution to journalArticle

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