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Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling

Obinna K. Chudi, Helen Lewis, D. A. V. Stow and J. O. Buckman
Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling (in Reservoir quality of clastic and carbonate rocks; analysis, modelling and prediction, P. J. Armitage (editor), A. R. Butcher (editor), J. M. Churchill (editor), A. E. Csoma (editor), C. Hollis (editor), R. H. Lander (editor), J. E. Omma (editor) and R. H. Worden (editor))
Special Publication - Geological Society of London (December 2016) 435 (1): 245-264

Abstract

Petroleum exploration and production in the region of the Niger Delta to date has mainly focused on the onshore, deltaic and offshore deep-water Miocene successions. Although Miocene turbidites have been the principal deep-water target, deeper-lying Oligocene sandstones are now being considered for exploration. This study targets an area beneath the Niger Basin slope at a present-day water depth of 800-1500 m. Within this study area, the Miocene to Recent sands above a burial depth of 3600 m show very good reservoir quality with porosities as high as 35% and permeabilities in the Darcy range. The aim of this study is to predict the reservoir quality and properties of the Oligocene sandstones below 3800 m using basin modelling to predict conditions where quartz cementation will take place and quartz cementation models to predict the amount of cementation and hence the potential porosity loss. Modelling results show that the Oligocene sandstones have been exposed to conditions favourable for quartz precipitation, but that less than 14% of the original porosity will have been occluded by quartz cement. These results are in agreement with elemental analysis from both petrophysical and petrological observation of thin sections. Although the deeper-lying Oligocene sandstones are likely to have reduced reservoir quality due to the presence of quartz overgrowth cementation, it appears likely that the volume of cement is relatively low and the Oligocene succession should be considered a viable play.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 435
Serial Issue: 1
Title: Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling
Title: Reservoir quality of clastic and carbonate rocks; analysis, modelling and prediction
Author(s): Chudi, Obinna K.Lewis, HelenStow, D. A. V.Buckman, J. O.
Author(s): Armitage, P. J.editor
Author(s): Butcher, A. R.editor
Author(s): Churchill, J. M.editor
Author(s): Csoma, A. E.editor
Author(s): Hollis, C.editor
Author(s): Lander, R. H.editor
Author(s): Omma, J. E.editor
Author(s): Worden, R. H.editor
Affiliation: Heriot-Watt University, Institute of Petroleum Engineering, Edinburgh, United Kingdom
Pages: 245-264
Published: 20161214
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 51
Accession Number: 2017-006046
Categories: Sedimentary petrologyEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., sects., sketch maps
N04°15'00" - N05°00'00", E05°00'00" - E07°30'00"
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201705
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