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Assessment of geothermal resource potential in Changbaishan utilizing high-precision gravity-based man-machine
Zhi-He Xu1,2,3,4, Ji-Yi Jiang1,3, Guan-Wen Gu1,3
1College of Earth Sciences, Institute of Disaster Prevention, Sanhe, China.
Geothermal exploration in Changbaishan utilized high-precision gravity surveys to identify deep geothermal resources. This study successfully mapped potential heat sources, reservoirs, and pathways, revealing a complex geothermal system north of the Tianchi caldera.
Area of Science:
- Geophysics
- Geothermal Energy Exploration
Background:
- Accurate assessment of geothermal resources is crucial for clean energy development but remains complex.
- Geothermal energy offers a climate-friendly alternative to fossil fuels.
Purpose of the Study:
- To precisely identify and assess deep geothermal resources north of the Tianchi caldera in Changbaishan.
- To delineate geothermal systems, including heat sources, reservoirs, and migration pathways.
Main Methods:
- Conducted ~2,000 large-scale, high-precision gravity survey points.
- Applied advanced data processing, including upwards continuation and 2.5D man-machine interactive inversion.
- Analyzed petrophysical parameters to interpret gravity anomalies and density variations.
Main Results:
- Identified two dome-shaped low-gravity anomalies and a positive gravity gradient anomaly.
- Differentiated between shield-forming basalts (2.58 g/cm³), geothermal reservoirs (2.60-2.75 g/cm³), and migration pathways (≤2.58 g/cm³).
- Revealed a geothermal system characterized by a sedimentary basin and uplifted mountains north of the Tianchi caldera.
Conclusions:
- High-precision gravity data effectively delineates deep geothermal resource elements.
- The study successfully identified a complex geothermal system in the Tianchi caldera region.
- This methodology aids in the precise assessment of geothermal potential for clean energy applications.
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