Template of Cretaceous lithostratigraphy in the North Sea. Preliminary status in 2007. An example of procedure process. Mike Charnock & Stephen Crittenden

1. 2007-01-22
Mike Charnock & Steve Crittenden
NorLex Cretaceous template

2. Date: 2007-01-22 • Page: 2 •
Steve Crittenden sends his apologies:
well-site takes priority!

3. Date: 2007-01-22 • Page: 3 •
Talk Overview
1. NorLex Original Project Objectives
2. Cretaceous TSC NorLex
Biostratigraphic Zonation
(proposal)
3. TSC Norlex Regional Norwegian
Lithostratigraphic Scheme
(proposed)
4. Figures templates (proposal)
1. Logos
2. Log Scales
3. Digital type sections
5. Deliverables
6. Mid Norway lithostratigraphic units
(established)
7. Timetable for deliverables
END OCTOBER 2007
(as per original project aims
agreement)
Timetable for ACTION

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1. NorLex Original Project Proposals

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2. Cretaceous TSC NorLex Biostratigraphic
Zonation (proposal)
 Digital TSC based
zonation.
 Regionally applicable.
 One zone per stage
i.e. Maastrichtian = MK1,
Campanian = MK2 etc
with subdivisions 1.1, 1.2
etc.
 Late Cretaceous:
planktonic foraminifera &
dinoflagellate cyst based.

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2. Cretaceous TSC NorLex Biostratigraphic
Zonation (proposal)
 Strong zonal control on
Cretaceous/Jurassic boundary
(`base `Cretaceous unconformity`)
 Use of Berriasian/Tithonian
Emphasis on marine planktonic
markers unless prefixed otherwise
[B]: Benthic Foraminifera,
[R] Radiolaria
[S] Spores/Pollen etc

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3. Cretaceous TSC NorLex Lithostratigraphic Zonation (proposal)

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3. Cretaceous TSC NorLex Lithostratigraphic Zonation (proposal)

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4. Figures templates (proposal)
 TEXT : Lithostratigraphic template
established
 FIGURES template?:
(proposal standardised )
-JPEG only illustrations?.
-Acceptable in either .pdf or
.wmf ?

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4. Figures template: Logos (proposal)

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4. Figures template: Log scales (proposal)
 Dalland et al 1988
- Variable GR 0- 100,
- 50 –150, 30-250 API
- Variable DT 160-60,
150- 50, 140.40 micro sec/ft
 Vollset & Dore:
- GR 0-100 API ; DT 140-40
PROPOSAL:
GR 0-150 API
DT 140-40 m secs/ft
DENSITY: 1.95 – 2.95 g/cm3
NEUTRON POROSITY:
0.54 –0.06 %

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4. Figures template: Digital sections (proposal)
 StrataBugs digital figures
 Additional interpreted age
(following Gradstein et al.,
2004) & selective
biostratigraphic events
(various sources)
 Clear indications of changes
in status

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5. Deliverables
 Cretaceous biostratigraphic
zonation
 Figures for all existing
Cretaceous type & reference wells
with biostratigraphy
 Figures for all proposed new
Cretaceous type & reference wells
with biostratigraphy
 Egga figures type & ref. wells.

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5. Deliverables
 Well distribution list of formations/members (mMD RKB)
 tops/bases/thickness (for mapping : ØH)

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Mid Norway lithostratigraphic units (established)
HOW IS MID NORWAY DEFINED?
We propose following Dalland et al (1988) and exclude Møre Margin.

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6. Mid Norway lithostratigraphic units
(established)
X

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Statoil 6506/12-1:
type well : Lyr Formation

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Statoil 6407/1-2:
ref. well : Lyr Formation

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Statoil 6506/12-1:
type well : Lange Formation; ref. Cromer Knoll Group

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6506/12-1
Lange: 622m gross / 7 Ma
Lyr: 24m gross /14 Ma

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Conoco 6507/7-1:
type well : Lysing Formation

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Statoil 6506/12-4:
ref. well : Lysing Formation

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Statoil 6506/12-4:
type well : Kvitnos Formation

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Statoil 6506/12-4:
type well : Springar and Nise Formations

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7. Cretaceous Deliverables
 TYPE/REFERENCE SECTION FIGURES
 FORMATION DISTRIBUTION LISTS (by wells) for mapping
 Mid Norway established units
- compilation (presentation today end Jan),
- submit to web after review (end Feb.)
 Viking Graben/Central Graben established units
- Compilation (end March),
- submit (end April)
 New units
- Compilation (end July),
- submit (end Aug.)
 CORRELATION FIGURES (end Sept)
 REVISED TEXT (end October)
Timetable for ACTION

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7. Timing
 NORLEX OR ROLEX ?
Timetable for deliverables
END OCTOBER 2007
(as per original project aims agreement)

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