Kick start development of green energy sources Airborne Geothermal - - PDF document

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Presented by Joey Li Ze Ying and Dr. Holger Eichstaedt

Kick‐start development of green energy sources

Airborne Geothermal Exploration

Objectives

• Fast track the geothermal exploration affords
• Reduce the costs for geophysics exploration

and deposit estimations

• Have higher probability of success in drilling of

explorations and preproduction wells

• Have data also prepared for

– Preliminary Planning and Approvals – Engineering planning and construction – Environmental Impact Assessment

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Theoretical background

• Hydrothermal ‐ heat‐carrier fluid, liquid water or steam

depends on the pressure and temperature. 1 to 10km deep – Lidar, Hyperspectral TIR LW

• Geopressurizaded ‐ similar to hydrothermal but in

deeper places, heat‐carrier fluid usually between 100 and 200ºC, 1000 bars and are very salty – Lidar, Broadband Thermal or Hyperspectral TIR LW

• Hot stones ‐ waterproof stones with a temperature

between 100 and 300ºC and next to the magmatic bags ‐ Hyperspectral TIR LW

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Technical solution

• Identification of the basic terrain structures
• Detection of the geological fault lines
• Evaluate these fault lines in their properties as of
• are they still thermal active
• are there clay minerals around the fault line on the

surface

• are their carbon monoxide and sulphurous gases

coming out of the fault lines

Technical solution

• Multisensory airborne approach combining

required sensors in one flight:

– Topographic high power airborne Lidar systems with full waveform data collection to penetrate also rainforest structures – Reflective Hyperspectral sensor in the visible to short wave infrared band (400 to 2500nm) – Thermal Hyperspectral sensor (7600 to 11800nm)

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• Satellite data for area detection, but not capable
• f identifying details for planning – very suitable

to identify the area of interest for the airborne

• perations
• Airborne operation (typically 50 to 500 sqkm)
• Geophysics and ground exploration work on the

identified thermal potential areas after the airborne survey

• Drill operations for exploration and

semiproduction

Positioning of the technical solution

• f airborne operations

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Detection of Fault lines

• Topographic mapping of the terrain using a

high power Lidar system

– Lidar in IR in 1064nm, class 3 eyesafe – Flying height: 1500m – Swath width (overlap 70%): 1000m – Point densities: 8 per sqm for topography

• Productivity: approx. 30 to 50 sqkm/flight

hour

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Verification of thermal properties of the fault line

• Usage of the thermal hyperspectral sensor

– Spectral resolution: brightness temperature function with correction of the emissivity – Spatial resolution 2m, thermal 0.1K corrected

• Data fusion with Lidar for “destriping” of

vegetation

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Mapping of clay minerals

• Usage of Hyperspectral VNIR and SWIR into

the solution for mapping of land vegetation, soils, detailed land use, forestry and agricultural parameters, geotechnical facts, pollution on land

– Flying height: still 600m – Same flight as dual Lidar solution – Spectral resolution: 416 bands in 400 to 2500nm – Spatial resolution: 1m

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General concept: Reflectance

• Material absorbs and reflect specific wavelength of light
• Identify materials by their spectral signature

Less reflectance Less reflectance Less reflectance More reflectance More reflectance More reflectance

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Mapping of gas output on the fault lines

• Integration of thermal hyperspectral for gas

analysis

– Spectral resolution: 130 bands in 7600 to 11800nm – Thermal resolution: better 0.018K – Spatial resolution: 2m

• Support of VNIR/SWIR Hyperspectral for indirect

detection of gas related changes on the vegetation

• CO, SOx and H2S are the

main gases around geothermal sources

• The mapping of this gases

is used to find even non airborne visible fumaroles

• The amount of gases and

mixture provides an indication of type of the prospect

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Further effects to look at

• Fumaroles, hot springs and the surrounding

– Differences in the Chemistry in geothermal and non‐geothermal water – not direct map able – Only detectable

• n temperature

– Usage of sediments around the water bodies

• Sulphur deposits in SWIR
• Silicates / Quartz structures on the shores in

LWIR

Sulphur

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The next steps on the way to a geothermal power production

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Thanks for your attention and please feel free to ask any question

holger@helipro.com.fj he@dimap‐spectral.com