NORTH SEA CORE DATA

We recognise the importance of having access to both physical and digital geoscience data. In addition to making core material available, we hope to make more data available for download in time. Please contact us if you with any questions regarding our online material or if you are interested in something we have not yet made available for download.

North Sea Core CIC data is licensed under a CC-BY-4.0 License. Please credit North Sea Core CIC for any material used.

CC-BY 4.0

CT SCANS OF CORE SAMPLES

There are many ways to analyse core samples, each with different purposes. Computerised Tomography (CT) scans are more commonly used in medicine but can be used as a non-destructive tool to image core material. Powerful x-ray photons create a 3D model where dense material appear brighter and less dense material appear dull. CT scans can be used to investigate pore networks, fractures, sedimentary bedding and more.

The resolution of the CT scans is 300 microns per slice thickness, with data produced by Core Specialist Services

 

All videos and images are downloadable. Videos produced by North Sea Core CIC. End credits by Studio No. 7

Photos of the various core samples used in the CT scans available for download.

UPPER JURASSIC OOLITIC LIMESTONE

This sample of oolitic limestone from the Upper Jurassic is from the Southern North Sea (Well 48/11b- 15). It is composed of bioclasts (shell fragments) and oolites. It is interpreted to have been deposited in a shallow marine or lagoonal environment, where calcium carbonate was able to build up on the surface of sand grains rolling back and forth on the sea floor.

The CT scan shows the gradual removal of the slightly less dense, carbonate-rich, fine grained lime mud until only the denser, carbonate oolites and shell fragments remain.

MIDDLE JURASSIC BROOM FORMATION

This sample of sandstone from the Middle Jurassic Broom Formation is from the Northern North Sea (Well 211/23- A18).  The sandstone is coarse grained with many carbonate fragments. It is interpreted to have been deposited in a marine fan delta system. 

The CT scan shows the gradual removal of the less dense sand material,  leaving behind the denser carbonate material. These are most likely shell fragments that were transported with the sand into the basin.​

MIDDLE JURASSIC RANNOCH FORMATION

This sample of sandstone is from the Middle Jurassic Rannoch Formation in the Northern North Sea (Well 211/23- A18). The sandstone is well sorted with laminations of quartz and micaceous minerals producing the slightly variation in colour. It is interpreted to have been deposited in a shoreface or delta front environment below wavebase.

The CT scan the gradual removal of slightly less dense, finer grained sandstone and micaeous material, leaving behind the denser, coarse grained sand material which highlights the bedding plains.

MIDDLE JURASSIC NESS FORMATION

This sample of interbedded claystones and sandstones from the Middle Jurassic Ness Formation is from the Northern North Sea (Well 211/23b- 12). It contains beds of varying thickness and potential bioturbation structures​. It is interpreted to have been deposited in a back barrier environment

The CT scan shows the removal of the less dense, finer grained, claystone material, followed by the sandstone material. What remains indicates potential carbonate material as either shell fragments or bioturbation.

MIDDLE JURASSIC NESS FORMATION

This sample of interbedded mudstones and sandstones from the Middle Jurassic Ness Formation is from the Northern North Sea (Well 211/23- A18). It contains mudstone laminations, syn-sedimentary structures​ and carbonate nodules. It is interpreted to have been deposited in a back barrier environment

The CT scan shows the removal of the less dense, sandstone material, revealing the carbonate-rich mudstone material and carbonate nodules along the bedding plains.

LOWER TRIASSIC SHERWOOD SANDSTONE

This sample of sandstone from the Lower Triassic Sherwood Sandstone Formation is from the Irish Sea (Well 110/03b- 6A). The sandstone is coarse grained with entrained mudclasts and is interpreted to have been deposited in a fluvial to alluvial plain environment.

The CT scan shows the removal of the less dense, fine grained sand material, leaving behind the denser, coarser grained sand material and small clasts which delineate the bedding planes.

UPPER PERMIAN ZECHSTEIN ANHYDRITE

This sample of Zechstein Anhydrite from the Upper Permian is from the Central North Sea (Well 21/16- 4). It is composed of anhydrite and is interpreted to have been precipitated following a period of intense evaporation in a marine restricted basin.

The CT scan shows that despite the colour variations of the core, the lack of density contrast indicates that only the anhydrite lithology is present.

UPPER PERMIAN ROTLIEGEND SANDSTONE

This sample of Rotliegend sandstone from the Upper Permian is from the Southern North Sea (Well 47/05d- 6). The sandstone varies from fine to coarse grained and is interpreted to have been deposited in an aeolian depositional environment. 

The CT scan shows the removal of the less dense, fine grained sand material, leaving behind the denser, coarser grained sand material with potentially micaceous material, that delineates the bedding planes. 

UPPER PERMIAN ROTLIEGEND SANDSTONE

 

This sample of Rotliegend sandstone from the Upper Permian Leman Formation is from the Southern North Sea (Well 49/06a- 4). The sandstone is well sorted and fine grained, with a cemented fracture visible. It is interpreted to have been deposited in a playa lake depositional environment. 

The CT scan shows the removal of the gradual fine grained sand material, revealing the denser mineralogy along the fracture plane. 

UPPER CARBONIFEROUS SANDSTONE

This sample of sandstone from the Upper Carboniferous is from the Southern North Sea (Well 44/27- 1). The sandstone is medium to fine grained with climbing ripples. It is interpreted to have been deposited in a fluvial environment and may represent a crevasse splay deposit.

The CT scan shows the gradual removal of the less dense sandstone material, leaving behind the denser sandstone material of the climbing ripples.

REGIONAL DEPOSITIONAL FACIES MAPS

Please use the interactive map below to locate our data in both geological time and space. Depositional facies maps are taken from the Oil and Gas Authority and Lloyd's Register UKCS Merged Regional Geological Maps.  More information on the regional stratigraphy can be found in the accompanying project report.

Depositional facies maps from the OGA and Lloyd's Register UKCS Merged Regional Geological Maps. Created with ArcGIS Online and the OGA Open Data resource.

Contact us: northseacore@gmail.com

Company Number: SC661048