Hydrocarbon plays of the Mid North Sea High: an …geoscience.wales › ... › 03 ›...
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-OGA Frontier exploration competitionlinked to future exploration licensing rounds in order to stimulate further offshore oil and gas exploration activity in the UKCS.
-Mid North Sea High and Rockall
-free data package which was available for download
-The competition was in two phases:
-A small number of applicants were awarded‘seed funding’ to carry out initial analysis.
-The successful candidate from the first phase would then be awarded further funds to develop their work into a final product for use by the OGA.
GWL awarded funding for both phases for a study of the Mid North Sea High
Hydrocarbon plays of the Mid North Sea High:an integrated seismic and basin modelling study
Stephen Corfield, Julian Moore, Maurice Bamford, Andrew Barnwell and Patrick Barnard
Westphalian sandstone, Tynemouth
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Mid North Sea High Study Area
Southern Gas basin
Mid North Sea High
Vast area between the Central Graben and the Southern Gas Basin
ca 80,000 km2
First well in the UK sectorwas drilled in Quad 38 in 1964-65
Written off because of the lack of mature source rocks-especially lack of Westphalian Coals
Onshore geology can be extrapolated offshore
38/29-1
Onshore gas in theCleveland Basin
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Data
Seismic:
Orange: OGA seismic
Blue: Legacy 2D
Wells:
113 LAS and scanned reports & logs
Source rock & fission track data
Potential Fields:
Gravity and Magnetic data
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-Interpret key seismic horizons across the study area,
-Produce a tectonic model of the area based on new seismic, wells and potential fields data.
-Review well data and document well reports and data availability,especially the availability of geochemical, fission track and borehole temperature data.
-basin modelling using 1D models of key wells plus a 3D Trinity model
-focus on Carboniferous source rocks
Workflow
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Tectonic zones of the Variscan Foreland
Gas Oil
N
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Tectonic evolution of the Variscan Foreland in the British Isles
Gas
Oil
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Seismic interpretation
Interpreted horizons in time and depth
Mid Miocene Top ChalkMiddle Jurassic UnconformityTop and Base ZechsteinBase WestphalianTop DinantianTop Scremerston Coal GroupTop DevonianTop Mid Devonian Kyle Limestone
Alpine
Base Zechstein depth map
Cimmerian
Variscan
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2015 line across the SE part of the study area
SW NE
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Mid Devonian Kyle Limestone
Base Zechstein
Top Zechstein
Base Chalk
Top Chalk
2015 line across the SE part of the study area
2015 line across the central part of the study area
Mid Miocene
SW NE
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2015 line across the central part of the study area
SW NE
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2015 line across the central part of the study area
Base Zechstein
Top Zechstein
Top ChalkMid Miocene
SW NEDevil’s Hole Basin
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2015 line across the Northernpart of the study area
NW SE
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Forth Approaches basinDevil’s Hole Basin
Mid Devonian Kyle Limestone
Base Zechstein
Top Zechstein
Base Chalk Top ChalkMid Miocene
2015 line across the Northernpart of the study area
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Mid Devonian Kyle Limestone
Silverpit Basin
Devil’s Hole Basin
Devil’s Hole Horst
N
North Dogger BasinCleveland Basin
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Silverpit Basin
Base Zechstein
Devil’s Hole Basin
North Dogger Basin
Devil’s Hole Horst
N
Cleveland Basin Breagh Gasfield
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Structural elements map
Compiled from seismic, potential fields and well data
Variscan anticline
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Need talk title and
introduction
Pre-Permian subcrop map
Dinantian
Namurian
Devonian
Westphalian
Upper Carboniferous restricted to the southern Margin of the MNSH
Lower Carboniferous Dinantiansediments over central and northern parts of the MNSH
Lower Palaeozoic extension of the Southern Uplands separates the MNSH from the Forth Approaches
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Source: Carboniferous Coals and marine mudstonesUnproved contribution from Permian marine mudstones (Kupfershiefer)
Seal: Zechstein Evaporites and intra-Carboniferous mudstones
Traps: Inversion anticlines of Variscan age subsequently modified by Tertiary Inversion4-way closures at Base Zechstein4-way closures at Bunter (Triassic) level
Trapping mechanisms in the gas play of the Southern North Sea
Bunter Sandstone
Carboniferous
Rotliegend
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Permo-Carboniferous Stratigraphy
Zechstein
RotliegendeVariscan Unconformity
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Zechstein reservoir
Marsden Rock, South Shields
Oil production in the Auk and ArgyleFields on the northern flank of theMid North Sea High
Gas production in the onshore Cleveland Basin(Lockton, Eskdale) and offshore stranded discoveries
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Lower Permian Rotliegende Sandstones
Gas production in the Southern North Sea
Westphalian Sandstones:
Gas production in the Silverpit Basin (Murdoch, Caister)
Permo-Carboniferous Reservoirs
Variscan unconformity
Tynemouth Priory
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Roaches Sandstone, North Staffordshire
Namurian delta top sandstones
Gas production in Quad 43
Trent Field has the main reservoir in the offshore equivalent of the ChatsworthGrit
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Photos Scremerston Coal Group
Fell Sandstone
Cementstones
Lower Carboniferous Scremerston Coal Group
Core Photos from 44/2-1 on the southern margin of the MNSH
Reservoir in the Breagh field, Quad 42. 8-18% porosity
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Principal Carboniferous Source Rocks:Westphalian Coal Measures
Westphalian Coal MeasuresNorth Staffordshire
Considered to be the major source for gasin the Southern North Sea
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Principal Carboniferous Source RocksBowland Shales
Bowland (Edale)Shales Castleton, Derbyshire
Important oil source rock in East Midlands and East Irish Sea. Not considered to be a major sourcein the North Sea
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Principal Carboniferous Source Rocks:Scremerston Coal Group
Scremerston Coal GroupScremerston, Northumberland
Thick Coals (2-3m) and rich oil shales
First appearance of Coal Measure faciesin the Lower Carboniferous
100-300m thick
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Westphalian Coals are of limited extent and not gas mature in the southern part of the study area
Bowland Shales are the major source rock in the southern part of the study area
Scremerston Coal Group is the most extensive source rock and is gas mature much further north than previous studies
Oil mature over large parts of the central andnorthern MNSH.
Same age as the Lothian oil shales in the Midland valley
However, it is uncertain if it has the capacity to generate large volumes of oil
Summary
Bowland (Edale) Shales at outcrop. Mam Tor, Derbyshire