Preliminary model of geothermal regimes

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Preliminary model of geothermal regimes
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Existing data
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Drill site
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Objectives

• The development of
• - a quantitative characterization technique
  for subsurface rock
• masses in terms of integrated geochemical,
  hydrological,
• geological and geophysical investigation
  methods.
• numerical modelling methods with more
  reliable inversion
• algorithms that consider coupled
  geo-thermo-hydro-mechanical
• and chemical processes.
• The integrated interpretation of down-the-hole
  and on-surface measurements of a large number of
  key geochemical, geological, thermal,
  hydrological, and mechanical variables with
  studies of mass transport in different phases.
• Long-term observations of changes in stress,
  electromagnetic transients, chemical water-rock
  interactions, mechanical properties and fluid
  flow characterisation including the nature of the
  saline groundwater interface evolution.
• Studies of impact cratering mechanisms, as well
  as related hydrothermal, metamorphic processes,
  magnetic and structural overprint.

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Importance of the site
relations between fracturing and other physical
properties (porosity, electric and thermal
conductivity, magnetic and hydrological) can be
tested over a large range of variation, the
structure is a closed system and the hydrothermal
consequences of the impact event the chemical
and biological development of that system after
the impact can be studied, knowledge of
importance for all kinds of deep subsurface
activities i.e. for geothermal exploration, CO2
storage, rad-waste storage and drilling
technology, and stress field, observations of
time variation of in flow, electromagnetic
fields, and strain are possible.
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Science team
KTH Lanru Jing, senior researcher, KTH-LWR, rock
mechanics Bo Olofsson, Prof., KTH-LWR,
applied geophysics Anders Wörman, Prof.,
KTH-LWR, geochemistry Gunnar Jacks,
Prof.em. KTH-LWR-geochemistry Herbert
Henkel, docent, KTH-LWR, applied geophysics,
impact tectonics SU Sandra Piazolo,
Assoc.Prof., SU-GEO, structural geology
Paula Lindgren, post doc., SU, hydrothermal
studies Other universities Wolf Uwe
Reimold, Prof., Humboldt Univ. Berlin, impact
petrology Sten Åke Elming, Prof.,
LTU-GEO. Paleomagnetics Further candidates
Daniel Ask, Maria Ask LTU, Bengt
Lejon LTU, rock mechanics, to be enquired
Laust B Pedersen, Prof. UU-GEO,
magnetotellurics Leif Bjelm, LTH-GEO,
deep drilling
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Exempel på modellering baserad på tyngdkraftsdata
av den hemisfäriska zon (de bruna färgerna) som
påverkas med ökad sprickbildning under en
nedslagskrater (Tvären).
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Illustration till frågan varför en så speciell
geologisk miljö som en nedslagskrater Fördelen
är en stor variation i sprickfrekvensen som
tillåter att mera säkert kunna bestämma sambanden
mellan olika egenskaper och sprickfrekvensen.
(Jämfört med en begränsad sprickfrekvens i vanlig
berggrund).