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Prediction of hydrocarbon recovery from turbidite sandstones with linked-debrite facies: Numerical flow-simulation studies

Prediction of hydrocarbon recovery from turbidite sandstones with linked-debrite facies: Numerical flow-simulation studies
Prediction of hydrocarbon recovery from turbidite sandstones with linked-debrite facies: Numerical flow-simulation studies
A series of two-dimensional numerical flow simulations were carried out to investigate the production characteristics of a sheet sandstone bed with a linked-debrite interval. A deterministic geological model was used based on a two-dimensional representation of a bed from the Marnoso Arenacea Formation. The model was 60 km long and 1 m thick and contained three zones, arranged in a vertical facies arrangement typical of many linked-debrite beds: i) a lower, coarse-to-medium grained, clean turbidite sandstone interval; ii) a middle, muddy sandstone, debrite interval; iii) an upper, fine-grained, clean, laminated sandstone interval. Simulation involved only a 3-km long sector of the model, with one injector well and one production well, placed 1-km apart in the middle of the sector model. The simulated sector was moved progressively down the length of the bed, in 1-km steps, sampling different parts of the bed with different facies proportions. The petrophysical properties of the debrite interval were varied to produce different porosity–permeability cases. All other modelling parameters, including the upper and lower interval petrophysics, were kept constant. Results indicate that, in most cases, key production parameters such as cumulative oil production with time and water cut are proportional to the volume of movable oil between the wells. This relationship does not hold, however, for cases with relatively low values of debrite porosity (?0.15) and permeability (kh ? 100 mD) where the debrite interval accounts for more than 20% of the interwell volume. In these models, production efficiency declines systematically with reducing reservoir quality and increasing debrite percentage, resulting in relatively low oil production and early water breakthrough.
Turbidite, Debrite, Numerical flow simulation, Two-phase flow, Oil production
0264-8172
2032-2043
Amy, Lawrence A.
857f581c-1529-424c-a948-91ab2fd476eb
Peachey, Simon A.
a7f937f3-7552-424d-aa32-a7eaed39256a
Gardiner, Andy A.
086d3deb-187a-4a06-869a-caa5d59c6c73
Talling, Peter J.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf
Amy, Lawrence A.
857f581c-1529-424c-a948-91ab2fd476eb
Peachey, Simon A.
a7f937f3-7552-424d-aa32-a7eaed39256a
Gardiner, Andy A.
086d3deb-187a-4a06-869a-caa5d59c6c73
Talling, Peter J.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf

Amy, Lawrence A., Peachey, Simon A., Gardiner, Andy A. and Talling, Peter J. (2009) Prediction of hydrocarbon recovery from turbidite sandstones with linked-debrite facies: Numerical flow-simulation studies. Marine and Petroleum Geology, 26 (10), 2032-2043. (doi:10.1016/j.marpetgeo.2009.02.017).

Record type: Article

Abstract

A series of two-dimensional numerical flow simulations were carried out to investigate the production characteristics of a sheet sandstone bed with a linked-debrite interval. A deterministic geological model was used based on a two-dimensional representation of a bed from the Marnoso Arenacea Formation. The model was 60 km long and 1 m thick and contained three zones, arranged in a vertical facies arrangement typical of many linked-debrite beds: i) a lower, coarse-to-medium grained, clean turbidite sandstone interval; ii) a middle, muddy sandstone, debrite interval; iii) an upper, fine-grained, clean, laminated sandstone interval. Simulation involved only a 3-km long sector of the model, with one injector well and one production well, placed 1-km apart in the middle of the sector model. The simulated sector was moved progressively down the length of the bed, in 1-km steps, sampling different parts of the bed with different facies proportions. The petrophysical properties of the debrite interval were varied to produce different porosity–permeability cases. All other modelling parameters, including the upper and lower interval petrophysics, were kept constant. Results indicate that, in most cases, key production parameters such as cumulative oil production with time and water cut are proportional to the volume of movable oil between the wells. This relationship does not hold, however, for cases with relatively low values of debrite porosity (?0.15) and permeability (kh ? 100 mD) where the debrite interval accounts for more than 20% of the interwell volume. In these models, production efficiency declines systematically with reducing reservoir quality and increasing debrite percentage, resulting in relatively low oil production and early water breakthrough.

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Published date: December 2009
Keywords: Turbidite, Debrite, Numerical flow simulation, Two-phase flow, Oil production

Identifiers

Local EPrints ID: 71626
URI: https://eprints.soton.ac.uk/id/eprint/71626
ISSN: 0264-8172
PURE UUID: 728a271d-a517-44da-a1c5-c048f5c8a06f

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Date deposited: 15 Dec 2009
Last modified: 19 Jul 2019 23:44

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Contributors

Author: Lawrence A. Amy
Author: Simon A. Peachey
Author: Andy A. Gardiner
Author: Peter J. Talling

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