Sensitivity of the impact of geological uncertainty on production from faulted and unfaulted shallow-marine oil reservoirs: Objectives and methods

T. Manzocchi, J.N. Carter, A. Skorstad, B. Fjellvoll, J. Strand, K.D. Stephen, J.A. Howell, J.D. Matthews, J.J. Walsh, M. Nepveu, C. Bos, A.R. Syversveen, L. Holden, O. Kolbjörnsen, C. Yang, P. Egberts, A. Tchistiakov, J. Cole, H. Jackson, S. Flint & 7 others C. Hern, K. Onyeagoro, H. Hovland, A. MacDonald, P.A.R. Nell, G. Yielding, R.W. Zimmerman

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Estimates of recovery from oil fields are often found to be significantly in error, and the multidisciplinary SAIGUP modelling project has focused on the problem by assessing the influence of geological factors on production in a large suite of synthetic shallow-marine reservoir models. Over 400 progradational shallow-marine reservoirs, ranging from comparatively simple, parallel, wave-dominated shorelines through to laterally heterogeneous, lobate, river-dominated systems with abundant low-angle clinoforms, were generated as a function of sedimentological input conditioned to natural data. These sedimentological models were combined with structural models sharing a common overall form but consisting of three different fault systems with variable fault density and fault permeability characteristics and a common unfaulted end-member. Different sets of relative permeability functions applied on a facies-by-facies basis were calculated as a function of different lamina-scale properties and upscaling algorithms to establish the uncertainty in production introduced through the upscaling process. Different fault-related upscaling assumptions were also included in some models. A waterflood production mechanism was simulated using up to five different sets of well locations, resulting in simulated production behaviour for over 35 000 full-field reservoir models. The model reservoirs are typical of many North Sea examples, with total production ranging from c. 15 × 10 m to 35 × 10 m, and recovery factors of between 30% and 55%. A variety of analytical methods were applied. Formal statistical methods quantified the relative influences of individual input parameters and parameter combinations on production measures. Various measures of reservoir heterogeneity were tested for their ability to discriminate reservoir performance. This paper gives a summary of the modelling and analyses described in more detail in the remainder of this thematic set of papers.
Original languageEnglish
Pages (from-to)3-15
Number of pages13
JournalPetroleum Geoscience
Volume14
Issue number1
DOIs
Publication statusPublished - Feb 2008

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Petroleum reservoirs
Oils
oil
upscaling
permeability
Recovery
Oil fields
oil field
river system
modeling
Uncertainty
method
shoreline
analytical method
Statistical methods
Rivers

Keywords

  • oil production
  • shallow marine
  • faults
  • uncertainty
  • sensitivity

Cite this

Sensitivity of the impact of geological uncertainty on production from faulted and unfaulted shallow-marine oil reservoirs : Objectives and methods. / Manzocchi, T.; Carter, J.N.; Skorstad, A.; Fjellvoll, B.; Strand, J.; Stephen, K.D.; Howell, J.A.; Matthews, J.D.; Walsh, J.J.; Nepveu, M.; Bos, C.; Syversveen, A.R.; Holden, L.; Kolbjörnsen, O.; Yang, C.; Egberts, P.; Tchistiakov, A.; Cole, J.; Jackson, H.; Flint, S.; Hern, C.; Onyeagoro, K.; Hovland, H.; MacDonald, A.; Nell, P.A.R.; Yielding, G.; Zimmerman, R.W.

In: Petroleum Geoscience, Vol. 14, No. 1, 02.2008, p. 3-15.

Research output: Contribution to journalArticle

Manzocchi, T, Carter, JN, Skorstad, A, Fjellvoll, B, Strand, J, Stephen, KD, Howell, JA, Matthews, JD, Walsh, JJ, Nepveu, M, Bos, C, Syversveen, AR, Holden, L, Kolbjörnsen, O, Yang, C, Egberts, P, Tchistiakov, A, Cole, J, Jackson, H, Flint, S, Hern, C, Onyeagoro, K, Hovland, H, MacDonald, A, Nell, PAR, Yielding, G & Zimmerman, RW 2008, 'Sensitivity of the impact of geological uncertainty on production from faulted and unfaulted shallow-marine oil reservoirs: Objectives and methods' Petroleum Geoscience, vol. 14, no. 1, pp. 3-15. https://doi.org/10.1144/1354-079307-790
Manzocchi, T. ; Carter, J.N. ; Skorstad, A. ; Fjellvoll, B. ; Strand, J. ; Stephen, K.D. ; Howell, J.A. ; Matthews, J.D. ; Walsh, J.J. ; Nepveu, M. ; Bos, C. ; Syversveen, A.R. ; Holden, L. ; Kolbjörnsen, O. ; Yang, C. ; Egberts, P. ; Tchistiakov, A. ; Cole, J. ; Jackson, H. ; Flint, S. ; Hern, C. ; Onyeagoro, K. ; Hovland, H. ; MacDonald, A. ; Nell, P.A.R. ; Yielding, G. ; Zimmerman, R.W. / Sensitivity of the impact of geological uncertainty on production from faulted and unfaulted shallow-marine oil reservoirs : Objectives and methods. In: Petroleum Geoscience. 2008 ; Vol. 14, No. 1. pp. 3-15.
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