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

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)

Abstract

Petroleum exploration and production in the Niger Delta region to date has mainly focussed on the onshore, deltaic and offshore deep-water Miocene successions. Although Miocene turbidites have been the principal deep-water target to date, 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 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 both elemental analysis from petrophysical and petrological observation of thin-sections. Although the deeper-lying Oligocene sandstones are likely to have reduced reservoir quality caused by the presence of quartz overgrowth cementation, it appears likely that the volume of cement is relatively low and that the Oligocene succession should be considered a viable play.
LanguageEnglish
Title of host publicationReservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction
EditorsP. J. Armitage, A. R. Butcher, J. M. Churchill, A. E. Csoma, C. Hollis, R. H. Lander, J. E. Omma, R. H. Worden
PublisherGeological Society of London
Pages245-264
Number of pages20
ISBN (Print)9781786201393
DOIs
Publication statusPublished - 2018

Publication series

NameGeological Society Special Publication
Volume435
ISSN (Print)0305-8719

Fingerprint

Oligocene
cementation
deep water
sandstone
quartz
prediction
basin
modeling
porosity
Miocene
cement
thin section
water depth
petroleum
permeability
sand

Cite this

Chudi, O. K., Lewis, H., Stow, D. A. V., & Buckman, J. O. (2018). Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling. In P. J. Armitage, A. R. Butcher, J. M. Churchill, A. E. Csoma, C. Hollis, R. H. Lander, J. E. Omma, ... R. H. Worden (Eds.), Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction (pp. 245-264). (Geological Society Special Publication; Vol. 435). Geological Society of London. https://doi.org/10.1144/SP435.8
Chudi, O. K. ; Lewis, Helen ; Stow, D. A. V. ; Buckman, J. O. / Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling. Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction. editor / P. J. Armitage ; A. R. Butcher ; J. M. Churchill ; A. E. Csoma ; C. Hollis ; R. H. Lander ; J. E. Omma ; R. H. Worden. Geological Society of London, 2018. pp. 245-264 (Geological Society Special Publication).
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abstract = "Petroleum exploration and production in the Niger Delta region to date has mainly focussed on the onshore, deltaic and offshore deep-water Miocene successions. Although Miocene turbidites have been the principal deep-water target to date, 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 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 both elemental analysis from petrophysical and petrological observation of thin-sections. Although the deeper-lying Oligocene sandstones are likely to have reduced reservoir quality caused by the presence of quartz overgrowth cementation, it appears likely that the volume of cement is relatively low and that the Oligocene succession should be considered a viable play.",
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Chudi, OK, Lewis, H, Stow, DAV & Buckman, JO 2018, Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling. in PJ Armitage, AR Butcher, JM Churchill, AE Csoma, C Hollis, RH Lander, JE Omma & RH Worden (eds), Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction. Geological Society Special Publication, vol. 435, Geological Society of London, pp. 245-264. https://doi.org/10.1144/SP435.8

Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling. / Chudi, O. K.; Lewis, Helen; Stow, D. A. V.; Buckman, J. O.

Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction. ed. / P. J. Armitage; A. R. Butcher; J. M. Churchill; A. E. Csoma; C. Hollis; R. H. Lander; J. E. Omma; R. H. Worden. Geological Society of London, 2018. p. 245-264 (Geological Society Special Publication; Vol. 435).

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)

TY - CHAP

T1 - Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling

AU - Chudi, O. K.

AU - Lewis, Helen

AU - Stow, D. A. V.

AU - Buckman, J. O.

PY - 2018

Y1 - 2018

N2 - Petroleum exploration and production in the Niger Delta region to date has mainly focussed on the onshore, deltaic and offshore deep-water Miocene successions. Although Miocene turbidites have been the principal deep-water target to date, 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 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 both elemental analysis from petrophysical and petrological observation of thin-sections. Although the deeper-lying Oligocene sandstones are likely to have reduced reservoir quality caused by the presence of quartz overgrowth cementation, it appears likely that the volume of cement is relatively low and that the Oligocene succession should be considered a viable play.

AB - Petroleum exploration and production in the Niger Delta region to date has mainly focussed on the onshore, deltaic and offshore deep-water Miocene successions. Although Miocene turbidites have been the principal deep-water target to date, 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 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 both elemental analysis from petrophysical and petrological observation of thin-sections. Although the deeper-lying Oligocene sandstones are likely to have reduced reservoir quality caused by the presence of quartz overgrowth cementation, it appears likely that the volume of cement is relatively low and that the Oligocene succession should be considered a viable play.

U2 - 10.1144/SP435.8

DO - 10.1144/SP435.8

M3 - Chapter (peer-reviewed)

SN - 9781786201393

T3 - Geological Society Special Publication

SP - 245

EP - 264

BT - Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction

A2 - Armitage, P. J.

A2 - Butcher, A. R.

A2 - Churchill, J. M.

A2 - Csoma, A. E.

A2 - Hollis, C.

A2 - Lander, R. H.

A2 - Omma, J. E.

A2 - Worden, R. H.

PB - Geological Society of London

ER -

Chudi OK, Lewis H, Stow DAV, Buckman JO. Reservoir quality prediction of deep-water Oligocene sandstones from the west Niger Delta by integrated petrological, petrophysical and basin modelling. In Armitage PJ, Butcher AR, Churchill JM, Csoma AE, Hollis C, Lander RH, Omma JE, Worden RH, editors, Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction. Geological Society of London. 2018. p. 245-264. (Geological Society Special Publication). https://doi.org/10.1144/SP435.8