Laggan Field 3D geological modelling: case study

Kheidri, L. H.; Cailly, F.; Jones, Kevin D.; Senneville, A. De; Gray, R.

doi:10.1144/sp397.5

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…Higher porosities (20%) have been preserved at depths greater than 3.5 km within the FSB as a result of chlorite overgrowths (Kheidri et al, 2014) (Fig. 13 and 14).…”

Section: Poor Vaila Fm Play Sandstone Quality and Hydrothermal Fluidsmentioning

confidence: 97%

Challenges of future exploration within the UK Rockall Basin

Schofield

Jolley

Holford

et al. 2017

PGC

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The UK Rockall Basin is one of the most underexplored areas of the UK Continental Shelf (UKCS), with only 12 exploration wells drilled since 1980. With only one discovery made in 2000 (Benbecula (154/1-1) gas discovery), the general view of the basin from an exploration viewpoint is not positive. However, over the last 15 years, our knowledge of the petroleum systems of the Atlantic Margin has substantially increased. With the recent acquisition of new seismic data by the UK Government as part of the OGA's Frontiers Basin Research Programme, it is a pertinent time to re-examine the prospectivity of the UK Rockall Basin.This paper presents a history of exploration within the UK Rockall Basin, from the first well drilled in the basin in 1980, to the last well, drilled in 2006. We then present new insights into the lack of success during exploration within the basin, in particular by focusing on the extensive Early Cenozoic volcanic rocks within Rockall, to illustrate the wide range of potential interactions with the petroleum system. We also present evidence that points to the potential of a viable intra-basaltic (Rosebank) type play along the eastern flank of the Rockall Basin.

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“…Higher porosities (20%) have been preserved at depths greater than 3.5 km within the FSB as a result of chlorite overgrowths (Kheidri et al, 2014) (Fig. 13 and 14).…”

Section: Poor Vaila Fm Play Sandstone Quality and Hydrothermal Fluidsmentioning

confidence: 97%

Challenges of future exploration within the UK Rockall Basin

Schofield

Jolley

Holford

et al. 2017

PGC

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The Laggan and Tormore fields, Blocks 206/1 and 205/5, UK Atlantic Margin

Clark¹,

Matthews²,

Parry³

et al. 2020

Memoirs

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The Laggan and Tormore fields are found within the Flett sub-basin of the Faroe–Shetland Basin. Situated 120 km west of the Shetland Islands in 600 m water depth, they are part of the deepest subsea development in the UK to date with a 143 km subsea tie-back to onshore facilities.The reservoirs are found within the T35 biostratigraphic sequence of the Paleocene Vaila Formation and comprise sand-rich turbiditic channelized lobes with good reservoir properties, separated by metric to decimetric shale packages. Laggan is a gas-condensate field, whereas Tormore fluid is a richer gas with a saturated oil rim. Seismic reservoir characterization is a key to the field development where differentiation of fluid type proved challenging. Both fields came on stream in 2016 as part of the Greater Laggan area development scheme.

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Spectral decomposition: an aid in characterizing field architectures of the Laggan and Tormore fields, Faroe–Shetland Basin

Wright¹,

Nice²,

Tazzi³

et al. 2017

PGC

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Spectral decomposition analyses seismic reflectivity data in the frequency domain, providing images of the subsurface that complement conventional seismic interpretation. It is a highly visual tool that allows additional value to be extracted from seismic data, to aid in the identification of geological information and to be used in conjunction with more traditional methods such as amplitude extraction and attribute analysis. The methods of spectral decomposition chosen utilized a top reservoir seismic reflection surface, with the selected dominant frequency volumes coloured and recombined in a spatial context to produce various red–green–blue (RGB) blends. Application of spectral decomposition to the Laggan and Tormore fields revealed the varied distribution of turbiditic sands, as well as extensive east–west faults that have previously been inferred from seismic reflection data. These enhanced images of the reservoir provide a more detailed interpretation of the field architecture and have been captured in DONG E&P UK Ltd's own fault and reservoir models, leading to a greater understanding of potential field development outcomes and future well placement decisions. Attempts to distinguish hydrocarbon effects using spectral decomposition proved difficult, although interesting frequency variations around a known gas–oil contact (GOC) were noted.

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Laggan Field 3D geological modelling: case study

Cited by 5 publications

References 2 publications

Challenges of future exploration within the UK Rockall Basin

Challenges of future exploration within the UK Rockall Basin

The Laggan and Tormore fields, Blocks 206/1 and 205/5, UK Atlantic Margin

Spectral decomposition: an aid in characterizing field architectures of the Laggan and Tormore fields, Faroe–Shetland Basin

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