1. The - and Prometheus-Project: Concepts for the Extraction of Heat from Deep and Tight Sedimentary Rock Jens Orzol (1), F. Rummel (2), R. Jung (1) (1): GGA-Institute, (2): Ruhr-University Bochum/MeSy GmbH

2. „Classically:“ Geothermal energy use of Hydrothermal Resources and by HDR/EGS-technology in crystalline rocks One step further: Extend geothermal energy extraction to deep and tight sedimentary rocks

3. GeneSys & Prometheus sedimentary rocks low porosity & permeability create artificial geothermal systems (EGS) transfer waterfrac technology to sediments Is there a self propping mechanism for sediments? fracture propagation in layered sediments? ….

6. stimulated heat exchanger

7. carboniferous rocks in a quarry south of well site faults and fractures from variscan orogeny

8. extrapolated to 4000 m: 101°C – 115°C – 128°C conservative estimate status: detailed feasibility study finished currently: planning of an exploratory well

9. develop and test one well concepts direct use: range of few MW thermal potentially economically attractive for numerous consumers

10. F. Böker, 1994 Research well Horstberg Z1 (4100 m) for in-situ testing and concept development Hannover site: pilot project for geothermal supply of GeoCenter

11. Stimulation operations Injection of 20.000 m³ fresh water Creation of a large fracture with high conductivity 50 l/s ≈ 330 bar

12. Cyclic operation sheme 1) Injection of cold water into frac 2) shut-in, where water heats up 3) production of hot water from frac 4) energy extraction by heat-exchanger

13. deep vertical circulation concept

16. Challenges at Hannover site (GeoCenter) deep drilling close to residential area water supply for stimulation frac-monitoring F. Böker, 1994

17. Conclusions/Outlook projects aim to transfer EGS concepts to sediments one well concepts and „classical“ HDR Water frac technology applicable to sediments fracture: large area, high conductivity one well concepts proven Preparatory work for Hannover and Bochum site started drilling 2006/2007 Thank you!

19. Cyclic operation sheme 1) Injection of cold water into frac

20. Cyclic operation sheme 2) Heating up of water in frac

21. Cyclic operation sheme 3) Production of hot water from frac

22. Fracture height ≈ 200 m ! fracture propagates through claystone! Solling-Sdst. Detfurth-Sdst.