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Office of Partner

1 (LP)GGA-Institut2 Vejle Amt3 Ringkjøbing Amt4 Sønderjyllands Amt4 Sønderjyllands Amt5 GEUS6 TNO-NITG7 LANU8 BGR9 BUG

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FBURVAL

FINAL CONFERENCE AND WORKSHOPWORKSHOPatat

GEOZENTRUMGEOZENTRUMHannoverHannover2006.11.292006.11.29--3030

BURVAL – THE RØDEKRO VALLEYTHE RØDEKRO VALLEY--AREAAREA

Surveying for buried valleys in a "sand in sand" geological setting

by use of a combination of gravimetry, reflection seismics

and well information

Steen ThomsenGroundwater department

Sønderjyllands AmtDanmark

BURVAL – THE RØDEKRO VALLEYTHE RØDEKRO VALLEY--AREAAREA

LEVEL OF PREQUATERNARY SURFACE: LEVEL OF PREQUATERNARY SURFACE: 1994 1994 CONCEPTIONCONCEPTION by by DGU (DGU (presently presently GEUS)GEUS)

LEVEL OF PREQUATERNARY SURFACE: LEVEL OF PREQUATERNARY SURFACE: 1994 1994 CONCEPTIONCONCEPTION by by DGU (DGU (presently presently GEUS)GEUS)

-110

-90

-70

-50

-30

-10

10

30

50

70

metres metres a.m.s.l.a.m.s.l.

LEVEL OF PREQUATERNARY SURFACE: LEVEL OF PREQUATERNARY SURFACE: 2003 2003 DRAFTDRAFT CONCEPTIONCONCEPTION by consulting companyby consulting company

metres metres a.m.s.l.a.m.s.l.

-210

-190

-170

-150

-130

-110

-90

-70

-50

-30

-10

10

30

50

70

LEVEL OF PREQUATERNARY SURFACE: LEVEL OF PREQUATERNARY SURFACE: 2005 2005 CONCEPTIONCONCEPTION WELL DATA ONLYWELL DATA ONLY

metres metres a.m.s.l.a.m.s.l.

-210

-190

-170

-150

-130

-110

-90

-70

-50

-30

-10

10

30

50

70

LEVEL OF PREQUATERNARY SURFACE:LEVEL OF PREQUATERNARY SURFACE: 2006 2006 CONCEPTIONCONCEPTION GRAVITY, SEISMIC AND WELL DATAGRAVITY, SEISMIC AND WELL DATA

metres metres a.m.s.l.a.m.s.l.

-130

-110

-90

-70

-50

-30

-10

10

30

50

70

GEOLOGICAL SETTING: GENEREL CONCEPTSGEOLOGICAL SETTING: GENEREL CONCEPTS

Geological profile

GEOLOGICAL SETTING: GENEREL CONCEPTSGEOLOGICAL SETTING: GENEREL CONCEPTS

CHALKCHALKCHALK

MIOCEN SAND (Ribe Fomation)

CHALK

MIOCEN SAND (Ribe Fomation)

CHALK

MIOCEN SAND (Odderup Fomation)

MIOCEN SAND (Ribe Fomation)

CHALK

MIOCEN SAND (Ribe Fomation)

MIOCEN SAND (Odderup Fomation)

QUATERNARY SAND, SILT AND CLAY

CHALK

MIOCEN SAND (Ribe Fomation)

MIOCEN SAND (Odderup Fomation)

QUATERNARY SAND, SILT AND CLAY

Prequaternary surface is 1994 conception by DGU

EastWest

DEEP INVESTIGATION WELL DEEP INVESTIGATION WELL –– PREQUATERNARY SURFACE IN ‚SANDPREQUATERNARY SURFACE IN ‚SAND--SAND‘SAND‘

Prequaternary surface:SAND ON EACH SIDE

LOCATION OF SELECTED DATALOCATION OF SELECTED DATADeep well supplying

information on the level of the Prequaternary

surface.

160.1359

Vibro reflection seismic line

surveyed in the project by

Aarhus University.

200

CMP locations of vibro reflection seismic lines

surveyed prior to the project by a

commercial contractor.

SkyTEM soundings

surveyed in the project by

Aarhus University.

Gravity stations surveyed by

Sønderjyllands Amt in the

project.

Positioning by use of DGPS

was performedby Kort- og

Matrikelstyrelsen.

100

200

300

400

500

600

700

800

900

950

25

100

200

300

400

500

600

700

800

900

1000

1050

160.101

160.286

160.1359

160.1526

Location of deep investigation well on previous ‚slide‘

‚‚TOTAL‘ BOUGUER ANOMALY FIELD: RESULTS OBTAINED IN THE PROJECTTOTAL‘ BOUGUER ANOMALY FIELD: RESULTS OBTAINED IN THE PROJECT

15.5

16.5

17.5

18.5

19.5

20.5

21.5

22.5

23.5

24.5

25.5

26.5

27.5

28.5

29.5

BOUGUER ANOMALYBOUGUER ANOMALYDatum: IGSN71Datum: IGSN71

Unit: mGalUnit: mGalNew New gravity stations are gravity stations are indicated by green crossindicated by green cross‘‘

Aabenraa no. 1

Rødekro no. 1

Level of bedrock: 1585 m.b.s.l.

Level of bedrock: 2279 m.b.s.l.

BAND PASSED RESIDUAL BOUGUER ANOMALY FIELDBAND PASSED RESIDUAL BOUGUER ANOMALY FIELD -- CUTCUT--OFF WAVELENGTH: 0.3 OFF WAVELENGTH: 0.3 6.5 km6.5 km

0 1000 2000 3000 4000METRES

BAND PASSED RESIDUAL GRAVITYmGal

Vibro reflection seismic line

surveyed in the project by Aarhus

University.

200

CMP locations of vibro reflection seismic lines

surveyed prior to the project by a

commercial contractor.

Gravity stations surveyed by

Sønderjyllands Amt in the project.

Positioning by use of DGPS was

performed by Kort-og

Matrikelstyrelsen.

100

200

300

400

500

600

700

800

900

950

25

100

200

300

400

500

600

700

800

900

1000

1050

BURIED VALLEY AT NYBØL BETWEEN AABENRAA AND HJORDKÆRBURIED VALLEY AT NYBØL BETWEEN AABENRAA AND HJORDKÆR

NORTH SOUTH

BAND PASS FILTERED RESIDUAL GRAVITY:CUT-OFF WAVELENGTHS: 0.3-6.5 KM

Gravity results bySteen Thomsen

Sønderjyllands AmtField observations, processing and interpretation

Rev. ST, 2006.11.28: ‘VibroSeisAAUGILine7+Gravi+PQdepth.cdr’

QUATERNARY SAND, SILT AND CLAY

MIOCENE SAND AND CLAY – ODDERUP AND ARNUM FORMATION

MIOCENE SAND AND CLAY –ODDERUP AND ARNUM FORMATION

MIOCENE SAND – RIBE FORMATION

UNDIFFERENTIATED MIOCENE-OLIGOCENE SAND, SILT AND CLAY -VEJLE FJORD, KLINTINGHOVED AND BREJNING CLAY FORMATION AND ARNUM FORMATION

PALEOCENE ’FAT’ CLAY AND MARL

CHALK CHALK

THE ‚RØDEKROTHE ‚RØDEKRO--BURIEDBURIED--VALLEY‘ AT DYBVADVALLEY‘ AT DYBVAD--LUNDERUPLUNDERUP

QUATERNARY SAND, SILT AND CLAYMIOCENE SAND AND CLAY –ODDERUP AND ARNUM FORMATION

MIOCENE SAND AND CLAY– ODDERUP AND ARNUM FORMATION

MIOCENE SAND – RIBE FORMATION MIOCENE SAND – RIBE FORMATION

UNDIFFERENTIATED MIOCENE-OLIGOCENE SAND, SILT AND CLAY VEJLE FJORD, KLINTINGHOVED AND BREJNING CLAY FORMATION AND ARNUM FORMATION

PALEOCENE ’FAT’ CLAY AND MARL

CHALK CHALK

CORRELATION BETWEEN RESIDUAL GRAVITY AND THE LEVEL THE PREQUATERCORRELATION BETWEEN RESIDUAL GRAVITY AND THE LEVEL THE PREQUATERNARY SURFACENARY SURFACE

Best linear fit

Well data with ID no.

Correlation coeficient: 0.53

-90 -80 -70 -60 -50 -40 -30 -20 -10 0 10LEVEL OF THE PREQUATERNARY SURFACE (meters a.m.s.l.)

-100

-50

0

50

100

150

200

250

300

350

400

450

RE

SID

UA

LG

RA

VIT

Y(λ

Gal

)

Seismic data withCMP or CDP no.

LEVEL OF PREQUATERNARY SURFACELEVEL OF PREQUATERNARY SURFACE IN THE RØDEKRO AREAIN THE RØDEKRO AREA

metres metres a.m.s.l.a.m.s.l.

-130

-110

-90

-70

-50

-30

-10

10

30

50

70

SKYTEM DATA REVEALS CLAYE TILLS IN THE DEEPER PART OF THE VALLEY

WHY ARE BURIED VALLEYS IN JYLLAND, DANMARK, FREQUENTLY ASSOCIATED WITH POSITIVE GRAVITY ANOMALIES?

1.201.10 1.30 1.40 1.60 1.70 1.80 1.90 2.10 2.20 2.30 2.401.50 2.00 2.501.00

1.201.10 1.30 1.40 1.60 1.70 1.80 1.90 2.10 2.20 2.30 2.401.50 2.00 2.501.00g/cm 3

g/cm 3

DENSITIES OF SEDIMENTSfound within the upper 400 meters of the geological package

in Jylland, Danmark

PEAT

“GYTJE” / MUD

POSTGLACIAL CLAY

POSTGLACIAL SAND

DILUVIAL CLAY

DILUVIAL SAND

TILL SAND/CLAY

MIOCENE (sand, clay)

OLIGOCENE

EOCENE

KERTEMINDE MARL

PALEOCENE

DANIEN CHALK

LIMESTONE (’Skrivekridt’)

1.201.10 1.30 1.40 1.60 1.70 1.80 1.90 2.10 2.20 2.30 2.401.50 2.00 2.501.00

1.201.10 1.30 1.40 1.60 1.70 1.80 1.90 2.10 2.20 2.30 2.401.50 2.00 2.501.00g/cm3

g/cm3

DENSITIES OF SEDIMENTSfound within the upper 400 meters of the geological package

in Jylland, Danmark

PEAT

“GYTJE” / MUD

POSTGLACIAL CLAY

POSTGLACIAL SAND

DILUVIAL CLAY

DILUVIAL SAND

TILL SAND/CLAY

MIOCENE (sand, clay)

OLIGOCENE

EOCENE

KERTEMINDE MARL

PALEOCENE

DANIEN CHALK

LIMESTONE (’Skrivekridt’)

BURVAL – THE RØDEKRO VALLEYTHE RØDEKRO VALLEY--AREAAREA

GRAVITY – problematic field conditions

MAPPING THE GEOMETRY OF THE BURIED VALLEY

HEAVY TRAFIC ON THE ROADS

SENSIBLE, TINY LACOSTE & ROMBERG GRAVITY METER