Country:

The Netherlands

Location:

Offshore, North Sea

Blocks:

F3

Coordinates:

N 54° 52’ 0.86” / E 4° 48’ 47.07”

Acquisition:

1987

(Re)processing:

1987

Value added Products:

2020

Data summary:

OpendTect project with 3D Seismic Data, Acoustic Impedance, Wells, Horizons

OpendTect license information:

License key protected parts of OpendTect (OpendTect Pro and the commercial plugins) can be used on this data set without license keys because the software does not check for license key when it runs on this data set.

Supported for OpendTect:

6.4 and onwards

Size:

14 GB (uncompressed), 7.2 GB (download)

License:

Download:

Original seismic:

Original source:

Value added products:

Survey type:

Both 2D and 3D

Inline range and step:

100, 750, 1

Crossline range and step:

300, 1250, 1

Z range and step:

0, 1.848, 0.004 Time

Inline bin size (m/line):

25

Crossline bin size (m/line):

25

Area (sq km):

386.92

More Info

F3 Demo Tutorial Exercises

This Self-Study course in an excellent introduction to all aspects of OpendTect and Plugins. The exercises in the manual are specifically written for the F3 demo survey. License key protected parts of OpendTect (OpendTect Pro and the commercial plugins) can be used on this data set without license keys because the software does not check for license key when it runs on this data set.

View Training manual (HTML)

Download Training manual (PDF)

- OpendTect Machine Learning - knowledge base

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.

Full Survey Description

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. 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 was 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).

References

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