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Netherlands Offshore F3 Block - Seismic Only

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General

Country:The Netherlands
Location:Offshore, NorthSea
Block:F3
Coordinates:N 54°52’0.86” / E 4°48’47.07
Year:1987
Data Summary3D Seismic Data, Wells, Horizons
Size:600 MB (uncompressed), 494 MB (download)
License: Creative Commons license


Please click here to view F3 survey location in Google Earth.

Contributor


Company:dGB Earth Sciences B.V.
Website: www.dGBes.com
Company:TNO
Website:http://www.tno.nl


Geological Features

Seismic Sequence Stratigraphy, Channels, Sandwaves, Glacial plowmarks, Surface expressions, Pockmarks, Shalow biogenic gas, Gas Chimneys, Bright spots, Flat spot, Faults, Dewatering Faults, Zechstein Salt dome

Applicable Techniques

Attributes

  • Spectral Decomposition
  • Energy
  • Similarity

Plugins

  • Dip-Steering
  • Neural Networks
  • SSIS
  • Spectral Blueing
  • Coloured Inversion

Note: All plugins run without license for this data-set

Full survey Description


Survey Location

F3 is a block in the Dutch sector of the North Sea. The block is covered by 3D seismic that was acquired to explore for oil and gas in the Upper-Jurassic – Lower Cretaceous strata, which are found below the interval selected for this demo set. The upper 1200ms of the demo set consists of reflectors belonging to the Miocene, Pliocene, and Pleistocene. The large-scale sigmoidal bedding is readily apparent, and consists of the deposits of a large fluviodeltaic system that drained large parts of the Baltic Sea region (Sørensen et al, 1997; Overeem et al, 2001).
The deltaic package consists of sand and shale, with an overall high porosity (20–33%). Some carbonate-cemented streaks are present. A number of interesting features can be observed in this package. The most striking feature is the large-scale sigmoidal bedding, with text-book quality downlap, toplap, onlap, and truncation structures.

MOUSE HOVER TEXT

Bright spots are also clearly visible, and are caused by biogenic gas pockets. They are not uncommon in this part of the North Sea. Several seismic facies can be distinguished: transparent, chaotic, linear, shingles. Well logs show the transparent facies to consist of a rather uniform lithology, which can be either sand or shale. The chaotic facies likely represents slumped deposits. The shingles at the base of the clinoforms have been shown to consist of sandy turbidites.

The original F3 dataset is rather noisy. To remove the noise, a dip-steered median filter with a radius of two traces must be applied to the data. Within the survey, four vertical wells are present. All wells had sonic and gamma ray logs. Only two wells (F2–1 and F3–2) had density logs. These logs were used to train a neural network that was then applied to the other two wells (F3–4 and F6–1) to predict density from sonic and gamma-ray logs. Porosity in all cases was calculated from density using the formula: Porosity = (2.65 – Density) / (2.65 – 1.05).


Survey parameters

Inline Range100750step 1
Crossline Range3001250step 1
Bin size (m) [inl/xl]2525 
Z Range (ms)01848step 4
Size (km)24 x 16


Available Data

Seismic

  • All_lines.cbvs

- ‘cbvs’ is a standard OpendTect seismic volume format (Common Binary Volume Storage)

Horizons

  • FS4
  • FS4_interpolated
  • FS6
  • FS6_interpolated
  • MFS4_interpolated
  • Truncation1
  • Truncation1_interpolated

Wells and available logs

  • F02–1 (Caliper, Density, GR, P-Wave, Porosity)
  • F03–2 (Density, GR, P-Wave, Porosity)
  • F03–4 (Density, GR, P-Wave, Porosity)
  • F06–1 (Density, GR, P-Wave, Porosity)


References

De Bruin, G. & Bouanga, E.C. , 2007,Time Attributes of Stratigraphic Surfaces, Analyzed in the Structural and Wheeler Transformed Domain, 69th EAGE Conference & Exhibition, June 2007, London Download PDF

Overeem, I, G. J. Weltje, C. Bishop-Kay, and S. B. Kroonenberg, 2001 The Late Cenozoic Eridanos delta system in the Southern North Sea Basin: a climate signal in sediment supply? Basin Research, 13, 293–312.

Schroot, B.M. and Schüttenhelm, R.T.E., 2003, Expression of shallow gas in the Netherlands North Sea, Netherlands Journal of Geosciences / Geologie en Mijnbouw 82 (1): 91–105 Download PDF

Sørensen, J.C., Gregersen, U, Breiner, M and Michelsen, O., 1997, High frequency sequence stratigraphy of upper Cenozoic deposits. Mar. Petrol. Geol., 14, 99–123.

Qayyum, F. and Akhter, G., 2008, Logical Expressions a basic tool in reservoir characterization, Oil&Gas Journal Volume 106.41, p33–42 Download PDF

Aminzadeh, F., and De Groot, P., “Neural networks and other soft computing techniques with applications in the oil industry,” EAGE Book Series, 2006.