Wytch Farm oilfield: deterministic reservoir description of the Triassic Sherwood Sandstone

Bowman, Mike; McCLURE, N. M.; Wilkinson, David

doi:10.1144/0041513

Cited by 26 publications

(25 citation statements)

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“…The average net to gross ratio of the sands is 0.7. This architecture forrns a strongly layered reservoir with KvfKh values of 0.01 in the Lower Sherwood compared with a KJKh ratio of 0.001 in the Upper Sherwood (Bowman et al, 1993).…”

Section: Field Characteristicsmentioning

confidence: 97%

Predicting Water Cut - A Geological Profile

Mitchell¹,

Sherrard²

1995

IOR 1995 - 8th European Symposium on Improved Oil Recovery

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The Wytch Farm Oilfield produces -95rnstbld oil from a Triassic fluvial sandstone reservoir. Water cut has increased over recent years at a rate of 1 500b/dlmonth.P1ot of water cut against time for individual welis reveal two characteristic profile types, either smooth or erratic. Analysis of production data, production logging data and core data indicates that water cut behaviour is controlled by heterogeneity of the sand over the interval perforated.\Vhere production logging data indicate fluid production from a single, thick homogeneous sand, water cut develops with a smooth, progressive proflle. Core data show that these sands have a uniform vertical permeability and water cut develops with a progressive, gravity stable, flood front.In weils where most of the flow is from a small number of thin sands, water cut develops in a step change marmer. Core reveals that these thin, highly productive sands have permeabilities > l000mD and are sandwiched between thick sequences dominated by low permeability (<5OrnD), nonproductive sands. The "steps" are caused as successive high permeability sands switch abruptly from oil to water.The relationships described above occur as end members of a continuum, Welis develop a unique water cut profile depending on the nature and distribution of sands perforated. Using this geological model, remedial well operations have been successfully optimised to maximise fleld productivity.

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Section: Field Characteristicsmentioning

confidence: 97%

Predicting Water Cut - A Geological Profile

Mitchell¹,

Sherrard²

1995

IOR 1995 - 8th European Symposium on Improved Oil Recovery

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“…By far the most important discovery in the southern England basins is the Wytch Farm field (Colter & Havard 1981;Dranfield et al 1987;Bowman et al 1993) (Fig. 5).…”

Section: Petroleum Explorationmentioning

confidence: 99%

“…Further appraisal of the Bridport reservoir drilling continued until 1977 when the deeper Triassic Sherwood Sandstone reservoir was discovered. The majority of the reserves lie in the Triassic reservoir and the field as a whole is believed to have recoverable reserves of 300 million barrels (Bowman et al 1993) (Fig. 6).…”

Section: Petroleum Explorationmentioning

confidence: 99%

“…In addition to these targets, secondary reservoirs are present within the carbonates of the Jurassic (e.g. Frome Clay and Cornbrash) and the siliciclastic units within the Triassic Mercia Mudstone Group (Bowman et al 1993;Underhill & Stoneley this volume).…”

Section: Play Conceptsmentioning

confidence: 99%

“…Hydrocarbon exploration and production in the area has been dominated by the discovery of the Wytch Farm oil field in eastern Dorset which has reserves of approximately 300 million barrels (Colter & Havard 1981;Bowman et al 1993). There are two primary plays in the area consisting of the Triassic Sherwood Sandstone Group and Jurassic Bridport Sandstone Formation reservoirs, respectively.…”

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confidence: 99%

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The exploration history and controls on hydrocarbon prospectivity in the Wessex basins, southern England, UK

Buchanan

1998

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The Wessex basins were formed during Mesozoic extension and were subsequently modified by Cretaceous uplift and Alpine inversion events. The basin geometry and evolution of the area is strongly controlled by the long-lived fault systems which cross the area.Two primary plays are recognized within the Wessex basins; the Triassic Sherwood Sandstone and the Jurassic Bridport Sandstone. These plays contribute the vast majority of the recoverable reserves in the area. The Triassic play consists of a Sherwood Sandstone Group reservoir, a Liassic mudstone source rock and a Mercia Mudstone Group regional seal. Hydrocarbons were generated from the Late Jurassic to Tertiary in the main kitchen area and migrated into a range of fault-related traps. The main risks on the play are reservoir quality together with the timing and the route of hydrocarbon migration into valid traps,The Jurassic play consists of the Bridport Sandstone Formation which is also sourced from the Liassic mudstones and the top seal is provided by the Fuller's Earth Formation. The dominant risk on this play is the extent and quality of reservoir facies. In the onshore domain trap definition, using two-dimensional seismic data, is an additional risk on both plays.

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