Data Publication

KTB Borehole Measurements: Temperature Logs of the German Continental Deep Drilling Program

GFZ Data Services

(2021)

Descriptions

KTB Borehole Measurements Data Temperature Logs Extensive borehole measurements were performed during the active drilling phase of the KTB pilot and main hole. The data report STR 21/03 KTB Borehole logging data contains the full description of the logging data given here. Please read it thoroughly to avoid inappropriate or wrong use of the data. The KTB borehole measurement data files contain the final processed versions of logging data from the two KTB boreholes: • KTB-Oberpfalz VB (KTB Vorbohrung/Pilot Hole or KTB-VB) • KTB-Oberpfalz HB (KTB Hauptbohrung/Main Hole or KTB-HB). Here only the acronyms KTB-VB and KTB-HB are used. In total there are 145 data files from the KTB-VB and 239 data files from the KTB-HB. All logs were run in open hole unless noted otherwise (see the file header). The maximum logging depth was 4001 m in the KTB-VB and 9085 m in the KTB-HB. The Temperature files contain data from measurements made with various sondes incorporating a temperature sensor. The single logs from each borehole reflect the temporary temperature profile, which was always disturbed and altered by drilling activities, mainly the the mud circulation. There is no reference temperature log showing the undisturbed equilibrium temperature profile from the active drilling phase until 1994. The best available approximation to the equilibrium profile of the KTB-HB was measured in 1998, in file KTB-HB-BM-TEMP-1996-1997-1998-2000.txt. Many of the Temperature logs also include a measurement of the mud resistivity (MRES from the auxiliary measurement tool, AMS), the resistivity of the fluid in the borehole. Please note that the Temperature logs are not depth corrected to the reference GR but are given here as logged. The data are provided in ASCII format. Detailed descriptions are provided in the associated data report (STR 21/03, Kueck et al., 2021) and the KTB Borehole Measurements Catalog. Acknkowledgements: The GFZ German Research Centre for Geosciences, Potsdam, Germany, as successor of the KTB Project Management provides the logging data, which were obtained under grants RG8604, RG8803 and RG 9001 of the Federal Ministry of Research and Technology of Germany.

General Information about the KTB Program The KTB (Kontinentales Tiefbohrprogramm der Bundesrepublik Deutschland) was the German Continental Deep Drilling Program with drilling operations from 1989 to 1994. Two boreholes, one 4 and the other 9.1 km deep, served as a telescope into the earth's interior to allow for in-situ observation of physical and chemical processes and calibration of surface experiments. One of the major goals of the KTB was the elucidation of structure and evolution of the interior zones in a former mountain chain. The drill site near Windischeschenbach, (NE Bavaria, Germany) is at the structural boundary between the Saxothuringian and Moldanubian, two major tectonostratigraphic units of the Hercynian fold belt of the Variscan Orogen in Central Europe. This boundary was regarded as a suture zone formed by the closure of a former oceanic basin c. 320 million years ago. This process gave way to a continent-continent collision and the formation of a mountain chain comparable to the today's extension of the Himalayan mountain chain. Today, the high mountain relief is eroded and, therefore, once deeply buried rocks are exposed at the surface. Therefore, this area is an ideal place for the study of deep-seated crustal processes. Furthermore, detailed geophysical surface experiments during pre-site survey studies revealed that the drill site is characterized by an anomalous high electrical conductivity and pronounced gravimetric and magnetic anomalies at drillable depth of about 10 km. Key questions to be addressed by continental deep drilling include the evaluation of fundamental processes occurring in the lithosphere, the outer skin of our planet and resource base for mankind. KTB's major research topics were: • Evaluation of geophysical structures and phenomena • Investigation of the thermal structure of the continental crust • In-situ investigation of rock-fluids and their contribution to formation of ore deposits • Elucidation of structure and evolution of the continental crust • Determination of the earth's stress field Furthermore, the establishment of a long-term depth laboratory was an initial goal of the KTB which has been realized by the GFZ – German Research Centre for Geosciences since 1996. The KTB drilling and research activities formed a German key contribution to worldwide efforts on understanding our planet and supported the founding of the International Continental Scientific Drilling Program, ICDP. Surface and sample investigations have shown that the rock pile drilled is a steeply dipping highly deformed orogenic stack whose major amphibolite facies overprint is of Caledonian age. Late-stage Tertiary faulting created the current block structure while the Hercynian impact such as granitic intrusions is minor. Borehole logging, tests and key experiments have revealed a higher than expected geothermal gradient of 28°/km with about 270°C and close to ductile conditions at 9100 m, a variable and close-to-fail stress regime in accord with models, and a large reservoir of saline deep fluids existing in a fracture-dominated reservoir down to at least 9 km depth.

Keywords

Originally assigned keywords

KTB

Kontinentale Tiefbohrung der Bundesrepublik Deutschland

German Continental Deep Drilling Program

ultradeep drilling

borehole measurements

downhole logging

wireline logging

downhole data

sonic

resistivity

gamma spectrum

density

porosity

spontaneous potential

magnetic susceptibility

logs

EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > ELECTRICAL FIELD > ELECTRICAL ANOMALIES

EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC INTENSITY

EARTH SCIENCE > SOLID EARTH > GEOTHERMAL DYNAMICS > GEOTHERMAL TEMPERATURE

EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY

EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS > METAMORPHIC ROCK FORMATION

EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS > STRESS

EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > GROUND WATER > AQUIFERS

EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > GROUND WATER > PERCOLATION

Corresponding MSL vocabulary keywords

borehole logging

porosity

electrical capacity

magnetic susceptibility

MSL enriched keywords

Equipment

borehole logging

Measured property

porosity

Measured property

porosity

electrical properties

electrical capacity

Measured property

magnetic susceptibility

unconsolidated sediment

clastic sediment

mud

equipment

mass spectrometer

accelerator mass spectrometer

igneous rock - intrusive

acidic intrusive

granite

metamorphic rock

amphibolite

electrical conductivity

tectonic plate boundary

convergent tectonic plate boundary

continental collision

orogen

suture zone

subduction

continent-continent subduction

Earth's structure

Earth crust

continental crust

lithosphere

Inferred behavior

anisotropy of magnetic susceptibility and remanence

magnetic anomalies

subsurface energy production

geothermal energy extraction

MSL enriched sub domains i

geo-energy test beds

rock and melt physics

analogue modelling of geologic processes

paleomagnetism

geochemistry

Source

https://dataservices.gfz-potsdam.de/icdp/showshort.php?id=505d3510-6af3-11eb-9603-497c92695674

Source publisher

GFZ Data Services

DOI

10.5880/gfz.ktb.bm.temperature

Creators

Kueck, Jochem

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0002-5155-0454

Conze, Ronald

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0002-8209-6290

Bram, Kurt

NLfB Niedersächsisches Landesamt für Bodenforschung, Hannover, Germany

Draxler, Hans

NLfB Niedersächsisches Landesamt für Bodenforschung, Hannover, Germany

Zoth, Gustav

NLfB Niedersächsisches Landesamt für Bodenforschung, Hannover, Germany

Kessels, Winfried

NLfB Niedersächsisches Landesamt für Bodenforschung, Hannover, Germany

Hänel, Ralph

NLfB Niedersächsisches Landesamt für Bodenforschung, Hannover, Germany

Contributors

Kueck, Jochem

ContactPerson

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0002-5155-0454

Kueck, Jochem

DataManager

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0002-5155-0454

Conze, Ronald

DataManager

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0002-8209-6290

GFZ German Research Centre For Geosciences

HostingInstitution

GFZ German Research Centre for Geosciences, Potsdam, Germany

Kueck, Jochem

ContactPerson

GFZ German Research Centre for Geosciences, Potsdam, Germany

Kueck, Jochem

ContactPerson

GFZ German Research Centre for Geosciences, Potsdam, Germany

References

10.48440/gfz.b103-21036

10.2312/ktb.88-8

10.2312/ktb.88-3

10.2312/ktb.92-1

10.2312/ktb.93-1

10.2312/ktb.94-1

10.2312/ktb.91-2

10.2312/ktb.90-6a

10.2312/ktb.90-1

10.2312/ktb.87-4

10.2312/ktb.88-4

10.2312/ktb.88-7

10.2312/ktb.90-6b

10.2312/ktb.92-5

10.2312/ktb.88-10

10.2312/ktb.89-3

10.2312/ktb.90-4

10.2312/ktb.91-1

10.2312/ktb.93-2

10.2312/ktb.87-3

10.2312/ktb.89-1

10.2312/ktb.91-4

10.2312/ktb.88-11

10.2312/ktb.90-5

10.2312/ktb.90-7

10.5880/gfz.ktb.bm.all

10.1029/96jb03945

10.1029/97jb01051

10.1029/96jb03861

10.17815/jlsrf-2-132

10.1007/978-3-030-10475-7_242-1

10.1029/96jb03442

10.1016/0148-9062(94)00017-w

ftp://datapub.gfz-potsdam.de/download/10.5880.GFZ.KTB.BM.ALL235sfgs

10.5880/gfz.ktb.top

Citation

Kueck, J., Conze, R., Bram, K., Draxler, H., Zoth, G., Kessels, W., & Hänel, R. (2021). KTB Borehole Measurements: Temperature Logs of the German Continental Deep Drilling Program [Data set]. GFZ Data Services. https://doi.org/10.5880/GFZ.KTB.BM.TEMPERATURE

Dates

Created:

1996

Collected:

1987/1994

Issued:

2021

Funding References

Funder name: Bundesministerium für Forschung und Technologie

Funder identifier: https://doi.org/10.13039/501100004937

Funder identifier type: Crossref Funder ID

Award number: RG8604

Funder name: Bundesministerium für Forschung und Technologie

Funder identifier: https://doi.org/10.13039/501100004937

Funder identifier type: Crossref Funder ID

Award number: RG8803

Funder name: Bundesministerium für Forschung und Technologie

Funder identifier: https://doi.org/10.13039/501100004937

Funder identifier type: Crossref Funder ID

Award number: RG 9001

Rights

Creative Commons Attribution 4.0 International

Geo location(s)

KTB Main Hole (KTB-HB) near Windischeschenbach

KTB Pilot Hole (KTB-VB) near Windischeschenbach