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7th Shallow Gas Group Meeting Baku, Azerbaijan, 07.10. – 11.10.2002 STRUCTURE AND DISTRIBUTION OF GAS HYDRATES IN MARINE SEDIMENTS Contribution 4, by:

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Presentation on theme: "7th Shallow Gas Group Meeting Baku, Azerbaijan, 07.10. – 11.10.2002 STRUCTURE AND DISTRIBUTION OF GAS HYDRATES IN MARINE SEDIMENTS Contribution 4, by:"— Presentation transcript:

1 7th Shallow Gas Group Meeting Baku, Azerbaijan, – STRUCTURE AND DISTRIBUTION OF GAS HYDRATES IN MARINE SEDIMENTS Contribution 4, by: F. Abegg, G. Bohrmann, GEOMAR J. Freitag & S. Kipfstuhl, AWI

2 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Introduction Objectives, techniques, working areas Examples of different internal gas hydrate structures Quantification of gas hydrate, free gas and host sediment A frozen core from the Black Sea A pressurised core from Hydrate Ridge Conclusions

3 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Tool: X-Ray CT scanner

4 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Frozen gas hydrate sample in a foam box

5 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Black Sea: core location

6 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Hydrate Ridge: core location

7 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Sample SO148-11

8 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Honeycomb structure 20 mm gas hydrate (light grey) mud (dark grey) carbonate (black spots)

9 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Sample SO148-20

10 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Dense gas hydrate 40 mm

11 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Sample SO148-14

12 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Alternating layers 50 mm

13 7th Shallow Gas Group Meeting Baku, Azerbaijan, – SO148-5: 3-D using 227 slices

14 7th Shallow Gas Group Meeting Baku, Azerbaijan, – SO148-5: 3-D cutout

15 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Example of thresholding

16 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Quantification of components Example from sample SO148-11

17 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Frozen core from the Black Sea

18 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Various analyses 3-D gas hydrate

19 7th Shallow Gas Group Meeting Baku, Azerbaijan, – MultiAutoklavCorer

20 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Pressurised? YES!!

21 7th Shallow Gas Group Meeting Baku, Azerbaijan, – LabTransferChamber positioned in CT scanner

22 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Results LTC4

23 7th Shallow Gas Group Meeting Baku, Azerbaijan, – shell/carbonate gas hydrate gas mud 10 cm subseafloor depth 27 cm subseafloor depth 29 cm subseafloor depth Slices from LTC4

24 7th Shallow Gas Group Meeting Baku, Azerbaijan, – D and 3-D

25 7th Shallow Gas Group Meeting Baku, Azerbaijan, – Conclusions CT is an appropriate tool to quantify gas hydrate, gas and host sediment on a mm-scale and to determine internal structures Together with autoclave technology the above is possible close to in situ conditions A frozen core from the Sorokin Trough shows gas hydrates in elongated near-vertical, crack-like features In situ gas hydrate concentration at Hydrate Ridge reaches 50 Vol.% in a horizontal layer with a gas content of up to 10 Vol.% Thank you very much for your attention! respond to:


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