Lateral accretion in a straight slope channel system: an example from the Forties Sandstone of the Huntington Field, UK Central North Sea

2017 ◽  
Vol 8 (1) ◽  
pp. 413-428 ◽  
Author(s):  
Chris Edwards ◽  
Sean McQuaid ◽  
Stewart Easton ◽  
Don Scott ◽  
Andrew Couch ◽  
...  
Keyword(s):  
North Sea ◽  
Seismic Data ◽  
High Concentration ◽  
Channel Networks ◽  
Channel System ◽  
Flow Circulation ◽  
Meander Bends ◽  
The Right ◽  
Central North Sea ◽  
Slope Channel

AbstractA rich dataset of core, well logs and 3D seismic data has been integrated to establish a depositional hierarchy of a Paleocene-aged, Forties slope channel system of the Huntington Field, Block 22/14b of the Central North Sea. The reservoir consists of a mix of high-concentration turbidites and muddy and sandy debrites deposited as a series of laterally offset, slope channel fills. Seismic data reveal that the channels were remarkably straight and devoid of meander bends, more commonly associated with sinuous slope channel networks. Paradoxically, the internal offlapping architecture draws close comparisons with lateral accretion packages that are widely accepted to be the products of secondary flow circulation around sinuous channel bends. The straight nature of the Huntington channels precludes such an interpretation but can be explained as a consequence of Coriolis effects acting upon suspension-dominated flows in Northern Hemisphere high latitudes, resulting in the preferential accretion of sediment along the right-hand bank (when viewed downstream) and leading to the eventual lateral avulsion of the channel. The observed architecture has been incorporated into a reservoir model in order to characterize the static connectivity of the field that will in turn serve as a basis for understanding production behaviour.

The Nelson Field, Blocks 22/11, 22/6a, 22/7, 22/12a, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 617-646 ◽  
Author(s):  
J. M. Kunka ◽  
G. Williams ◽  
B. Cullen ◽  
J. Boyd-Gorst ◽  
G. R. Dyer ◽  
...  
Keyword(s):  
North Sea ◽  
Seismic Data ◽  
Pipeline System ◽  
Gas System ◽  
Oil Export ◽  
The Uk ◽  
Central North Sea ◽  
4D Seismic ◽  
3D Seismic Data ◽  
Exploration Well

AbstractThe Nelson Field is located in Blocks 22/11, 22/6a, 22/7 and 22/12a in the UK Central North Sea. Nelson is a simple dip closed structure and is one of a series of Palaeocene Forties Sandstone Member oil accumulations situated on the Forties-Montrose High. The first exploration well on the prospect, 22/11-1, was drilled by Gulf Oil in 1967. Although hydrocarbon shows were encountered in a heterolithic section of Forties Sandstone Member, the well failed to flow on test and was abandoned. 3D seismic data were first acquired in 1985 and led to the discovery of Nelson in 1988 when the 22/11-5 well was drilled by Enterprise Oil plc. Following appraisal drilling, Nelson was granted production consent and the field came on-stream in February 1994. The hydrocarbon type is a light 40° API crude with a GOR of 555 SCF/BBL and is believed to be sourced from the East Forties Basin. The Nelson Field is developed from a 36 slot minimum facilities platform. Currently there are 23 platform producers, four sub-sea producers and four platform water injectors. Oil export is via the Forties Pipeline System and gas export is via the Fulmar Gas System. Oil originally in place is estimated at 790 million barrels of oil (MMBBL). Up to end-1999, the field had produced 261 MMBBL. Since the field was described by Whyatt et al. (1992), a further 28 wells have been drilled resulting in the collection of a considerable amount of new geological and geophysical data. This now includes a total of 6500 ft of Palaeocene core and 4D seismic data. This has enabled a more detailed understanding of the structure and sequence stratigraphy of the Nelson Field. This paper illustrates the importance of seismic mapping, high resolution biostratigraphy and sedimentology in developing the Nelson Field model.

The Chestnut Field, Block 22/2a, UK North Sea

2020 ◽  
Vol 52 (1) ◽  
pp. 413-423 ◽  
Author(s):  
R. van Oorschot ◽  
A. Fletcher ◽  
H. Basford ◽  
A. Stuart
Keyword(s):  
North Sea ◽  
Seismic Data ◽  
Seismic Imaging ◽  
Gas Condensate ◽  
Production Data ◽  
Lower Eocene ◽  
The Witch ◽  
The Uk ◽  
Central North Sea

AbstractThe Chestnut oilfield was discovered in 1986 and lies within Block 22/2a, Licence P354, of the UK Central North Sea. The field is approximately 7 km south of the Britannia gas condensate field and 8 km SE of the Alba oilfield on the southern edge of the Witch Ground Graben. The field comprises injected Lower Eocene Nauchlan sandstone encased within Horda Formation shales. The Chestnut Field began production in 2008 through the Hummingbird floating production vessel by means of two producer wells and one injector well. The complex reservoir geometries present seismic imaging challenges, and production data have indicated a larger connected volume than mapped from seismic data. In 2017, an infill producer well was drilled to arrest production decline. This well proved the presence and connectivity of sandstone beyond the field interior and increased confidence in using seismic data for predicting the injectite reservoir distribution.

The Mariner Field, Block 9/11a, UK North Sea

2020 ◽  
Vol 52 (1) ◽  
pp. 886-896 ◽  
Author(s):  
S. Y. Silcock ◽  
R. J. Baptie ◽  
A. Iheobi ◽  
S. Frost ◽  
A. Simms ◽  
...  
Keyword(s):  
North Sea ◽  
Deep Water ◽  
Heavy Oil ◽  
Seismic Data ◽  
Seismic Imaging ◽  
Production Test ◽  
Submarine Slope ◽  
Key Issues ◽  
Slope System ◽  
Slope Channel

AbstractThe Mariner Field is located on the East Shetland Platform in UK Block 9/11, 320 km to the NE of Aberdeen. The 9/11-1 well was drilled in 1981, discovering oil in the Paleocene Heimdal Sandstone Member and the Paleocene Maureen Formation.The deeper Maureen Formation was deposited on a submarine slope as canyon fill, and overspill canyon sands and debrites. The Heimdal Sandstone Member was deposited above the Maureen Formation on the same inherited, but younger, submarine slope system as deep-water slope channels, and is encased within suspension-deposited Lista Formation claystones. These slope channel sands have undergone post-depositional remobilization and sand-injection processes, leading to the complex sandstone geometries identified and mapped on seismic data.During a 36-year period, 28 exploration, appraisal and production test wells were drilled in UK Block 9/11, but only now is the field finally undergoing development. The long interval between discovery and development is due to several key issues, including the fact that development of heavy oil is technically and commercially challenging, and that the seismic imaging of the Heimdal Sandstone Member has been difficult or not possible until recently. These challenges are being overcome and the Mariner Field started producing in August 2019.

Successful application of time-lapse seismic data in Shell Expro's Gannet Fields, Central North Sea, UKCS

2003 ◽  
Vol 9 (1) ◽  
pp. 25-34 ◽  
Author(s):  
H. J. Kloosterman ◽  
R. S. Kelly ◽  
J. Stammeijer ◽  
M. Hartung ◽  
J. van Waarde ◽  
...  
Keyword(s):  
North Sea ◽  
Seismic Data ◽  
Time Lapse ◽  
Central North Sea

scholarly journals Bicuspid aortic valve morphology and aortic valvular outflow jets: an experimental analysis using an MRI-compatible pulsatile flow circulation system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kaoru Hattori ◽  
Natsuki Nakama ◽  
Jumpei Takada ◽  
Gohki Nishimura ◽  
Ryo Moriwaki ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Bicuspid Aortic Valve ◽  
Pulsatile Flow ◽  
Aortic Wall ◽  
Ascending Aorta ◽  
Circulation System ◽  
Resonance Imaging ◽  
Left Posterior ◽  
Flow Circulation ◽  
The Right

AbstractThe characteristics of aortic valvular outflow jet affect aortopathy in the bicuspid aortic valve (BAV). This study aimed to elucidate the effects of BAV morphology on the aortic valvular outflow jets. Morphotype-specific valve-devising apparatuses were developed to create aortic valve models. A magnetic resonance imaging-compatible pulsatile flow circulation system was developed to quantify the outflow jet. The eccentricity and circulation values of the peak systolic jet were compared among tricuspid aortic valve (TAV), three asymmetric BAVs, and two symmetric BAVs. The results showed mean aortic flow and leakage did not differ among the five BAVs (six samples, each). Asymmetric BAVs demonstrated the eccentric outflow jets directed to the aortic wall facing the smaller leaflets. In the asymmetric BAV with the smaller leaflet facing the right-anterior, left-posterior, and left-anterior quadrants of the aorta, the outflow jets exclusively impinged on the outer curvature of the ascending aorta, proximal arch, and the supra-valvular aortic wall, respectively. Symmetric BAVs demonstrated mildly eccentric outflow jets that did not impinge on the aortic wall. The circulation values at peak systole increased in asymmetric BAVs. The bicuspid symmetry and the position of smaller leaflet were determinant factors of the characteristics of aortic valvular outflow jet.

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