The reservoir characterization of the Sea Lion Field

Griffiths, Alun

doi:10.1144/petgeo2014-041

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…The best stratigraphic control is provided by the dense set of wells that occur in and around the Sea Lion discovery and they provide an excellent constraint on interpretations in the northern basins. More details about those wells and the specifics of the Sea Lion discovery can be found in Bunt (2015), Farrimond et al (2015), Francis et al (2015), Holmes et al (2015), MacAulay (2015) Griffiths (2015) and Williams (2015), and also in Richards & Hillier (2000a, b).…”

Section: Datamentioning

confidence: 99%

Role of rift transection and punctuated subsidence in the development of the North Falkland Basin

Lohr¹,

Underhill

2015

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The results of well-constrained seismic interpretation and new mapping of three-dimensional (3D) seismic data volumes demonstrates that the North Falkland Basin consists of two superimposed failed rift basins: a Late Jurassic NW-SEstriking Southern Rift Basin (SRB); and an Early Cretaceous north-south-striking Northern Rift Basin (NRB).The SRB is best developed in coastal waters of the Falkland Islands, where it comprises a series of extensional sub-basins that are transected by faults belonging to the more substantive NRB. Regional interpretation demonstrates that the NRB consists of a southward-tapering, asymmetric extensional basin containing a thick (in excess of 10 km) sequence of sediments. Its syn-rift subsidence history was controlled by a major west-dipping normal fault array comprising several fault segment precursors, which, together with corresponding antithetic faults, effectively subdivides the hanging wall into a series of subbasins throughout its length.The NRB initially developed in a fluvial and later lacustrine environment before becoming predominantly marine in the Tertiary. A prograding delta system filled the basin from the north during the early post-rift phase. Contemporaneously, sediment was shed off the segmented basin-bounding fault via long-established feeder drainage systems through breached relay ramps into the depocentre. The resultant sediment dispersal led to deposition of numerous lacustrine turbidites that created the Sea Lion fans and its affiliates, the location of which mimics, and is thus interpreted to have been controlled by, the underlying syn-rift sub-basins.Post-rift subsidence was punctuated by an important, but short-lived, phase of basin inversion during the Aptian that created a large, broad and gentle north-south-striking anticline that runs along the central basin axis. Whilst the episode of basin inversion arrested subsidence, it did not inhibit petroleum prospectivity. The syn-rift lacustrine source intervals did subsequently pass through the critical moment in the Cretaceous leading to hydrocarbon maturation and the migration of waxy oil, a process that continues to the present day.

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Section: Datamentioning

confidence: 99%

Role of rift transection and punctuated subsidence in the development of the North Falkland Basin

Lohr¹,

Underhill

2015

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“…Characteristics of the reservoir sands penetrated by wells in the Sea Lion Field are presented in Griffiths (2015). Average core porosity throughout the reservoirs is 22%, with an average permeability of around 185 mD in the main reservoir facies (ranging from a few tens of mD up to around 1500 mD).…”

Section: S C O T I a P L A T E S C O T I A P L A T E S O U T Hmentioning

confidence: 99%

“…Average core porosity throughout the reservoirs is 22%, with an average permeability of around 185 mD in the main reservoir facies (ranging from a few tens of mD up to around 1500 mD). Griffiths (2015) provides a summary of the reservoir characterization and geomodelling workflow. The 10 facies types recognized in core are grouped into four facies associations or rock types for modelling purposes.…”

Section: S C O T I a P L A T E S C O T I A P L A T E S O U T Hmentioning

confidence: 99%

“…Although the grouping of facies into facies associations has simplified the facies model, the depositional character and information that will affect fluid flow in the simulation model have been retained through the application of finegrid models. Facies discrimination by methods other than core logging is problematic and represents one of the main challenges in reservoir characterization, as discussed by Griffiths (2015).…”

Section: S C O T I a P L A T E S C O T I A P L A T E S O U T Hmentioning

confidence: 99%

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Sedimentology of the Lower Cretaceous reservoirs of the Sea Lion Field, North Falkland Basin

Williams¹

2015

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The Sea Lion Field in the North Falkland Basin was discovered in 2010 by Well 14/10-2, which tested oil from Lower Cretaceous sands of the Sea Lion fan complex. Appraisal of the field involved the drilling of a further eight wells from which an extensive wireline-log data set and 455 m of core were acquired. This unique data set has allowed detailed study of the reservoir sedimentology and has significantly benefited reservoir characterization. The reservoirs are interpreted to be deposited in a deep-water lacustrine basin as base-of-slope to basin-floor fans fed by canyons or channel-feeder systems from the east. Deposition is considered to have been affected both by turbidity currents and by liquefied sediment gravity flows, such that reservoir facies are dominated by those associated with high-and low-density turbidites, mass-flow deposits, and, to a lesser extent, hybrid-event beds. In the absence of significant chronostratigraphic control, the description of the first-order reservoir architecture is primarily driven by seismic interpretation, whilst the core affords significant control of the internal architecture of individual fans. Several lines of evidence point towards the Sea Lion sands being derived from a coexisting, shallow-water system on the eastern margin of the basin. Palaeogeographical reconstruction links this shoreface system to a large, contemporaneous, southerly-prograding delta via wave reworking and longshore drift of delta-front sands. Evolution of this delta has played a significant role in the timing, positioning and emplacement of fans along the eastern margin of the North Falkland Basin. The overall impact of the core data set has been to improve confidence in the reservoir characterization and spatial distribution of facies within the reservoir model, and to narrow significantly the range of uncertainty, which has direct implications for field development planning.

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“…The basin has large amounts of sand deposits (Bunt, 2015;Williams, 2015) and 930 comprise multiple basin-floor fans that offlap into a deep lake basin (Griffiths, 2015). (Fig.…”

mentioning

confidence: 99%

Where is my sink? Reconstruction of landscape development in southwestern Africa since the Late Jurassic

et al. 2017

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The reservoir characterization of the Sea Lion Field

Cited by 9 publications

References 15 publications

Role of rift transection and punctuated subsidence in the development of the North Falkland Basin

Role of rift transection and punctuated subsidence in the development of the North Falkland Basin

Sedimentology of the Lower Cretaceous reservoirs of the Sea Lion Field, North Falkland Basin

Where is my sink? Reconstruction of landscape development in southwestern Africa since the Late Jurassic

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