Workshop 22

The Geology of the North Sea in a Single Day Sunday, June 7th |

Convenors

  • Henk Kombrink (North Sea Core)

Description

The geological history of the North Sea is an incredibly rich journey through a range of climates and depositional environments. From Devonian continental deposits to Eocene deep-water turbidites, thanks to its near-continuous history of subsidence, the North Sea is not only one of the world’s classic petroleum provinces, it is also a unique archive that allows us to reconstruct the history of the area as it shifted from south of the equator to its northern position at the present day.

 

Because the reservoirs that were deposited in deserts and deep seas have been targeted by numerous exploration, appraisal and development wells, from which a huge amount of cores were cut, we have the material that allows us to unravel the depositional history of the North Sea in unprecedented details. That is what this workshop will be about.

 

Starting in Devonian times, we will spend the full day making our way from intra-montane basins and eroded basement blocks, via a catastrophic flooding in Permian times, to unconsolidated Forties sands that may seem to have found that final destination yesterday. Every core tells its story, and supported by short presentations and a series of tailored diagrams, the North Sea will come to life during this day of geological time-travelling.

Sub-Topics that will be covered in the workshop:

Sedimentology, Stratigraphy, Paleogeography, Basin Analysis, Petroleum Geology

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Participant Profile

Anyone who wishes to increase their understanding of how the North Sea evolved over geological time, or see a very diverse range of depositional environments captured in core from a single basin.

Workshop Programme

TimeActivity
09:00Welcome
09:15How coring works
09:30Introduction to North Sea Core and what the day will bring
09:45How the North Sea was discovered
10:00Taking a look at the first core ever cut in the UK North Sea – 38/29-1
Start of our geological walk through the North Sea
10:15Basement and Devonian – the start of widespread deposition following the Caledonian Orogeny
10:25Taking a look at basement and Devonian cores from the Inner Moray Firth and the Buchan field
10:40The Carboniferous of the North Sea – The story of two contrasting depositional environments
10:50Taking a look at Carboniferous cores from the Central and Southern North Sea
11:00Break
11:15The Permian of the North Sea – Deserts and shallow seas
11:25Taking a look at Rotliegend and Zechstein cores – Various eolian deposits, followed by a variety of carbonates and evaporites
11:50The Triassic of the North Sea – Dryland fluvial deposition across vast areas
12:00Taking a look at Triassic cores from the Northern, Central and Southern North Sea – inspecting how facies belts were grossly equal during the Early Triassic
12:15The Middle Jurassic of the North Sea – Uplift and deltaic progradation
12:25Taking a look at Middle Jurassic cores of the Brent Group, the Beatrice field and the Rattray volcanics in the Central North Sea
12:45Lunch break
13:30The Upper Jurassic of the North Sea – Extension and deep basins
13:40Taking a look at Upper Jurassic cores – the Kimmeridge Clay source rocks, shallow and deep marine sands
14:00The Cretaceous of the North Sea – More than just fines and post-rift subsidence
14:10Taking a look at Cretaceous cores – Turbidites of the Kopervik trend and Chalk of Late Cretaceous age
14:25The Cenozoic of the North Sea – The start of a massive sediment dump
14:45Break
Special topics
15:00Volcanics – Looking at the northernmost UK well drilled on the Erlend Volcano
15:10The Durward and Dauntless field – developing a marginal discovery
15:25Unconformities – The Base Permian and Base Cretaceous unconformities in core
16:00The Zechstein flooding in core – the most dramatic geological event in the North Sea
16:15Coring accidents – the Upper Jurassic of well 15/21b-50
16:30Closure and group discussion
17:00End of the day