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Metadata Files

Data Publication

KTB Borehole Measurements: Geochemical Logs (GLT) of the German Continental Deep Drilling Program

Kueck, Jochem | Conze, Ronald | Bram, Kurt | Draxler, Hans | Zoth, Gustav | Kessels, Winfried | Hänel, Ralph

GFZ Data Services

(2021)

Descriptions

KTB Borehole Measurements Data Geochemical Logs (GLT) Extensive borehole measurements were performed during the active drilling phase of the KTB pilot and main hole. All KTB borehole measurements are described in detail in the Scientific Technical Report - Data 21/03 "KTB Borehole Logging Data" (Kück et al. 2021). 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 files of the Geochemical Logs contain data from measurements made with the Schlumberger GLT sonde. This sonde was a combination of several passive and active nuclear tools yielding the relative abundances of nine elements. The geochemical logs are depth corrected to the reference GR (see Composite Logs) of the respective borehole. 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
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
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

Source

https://dataservices.gfz-potsdam.de/icdp/showshort.php?id=d78384f3-6af2-11eb-9603-497c92695674

Source publisher

GFZ Data Services


DOI

10.5880/gfz.ktb.bm.glt


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: Geochemical Logs (GLT) of the German Continental Deep Drilling Program [Data set]. GFZ Data Services. https://doi.org/10.5880/GFZ.KTB.BM.GLT


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