1. |
|
|
2. |
- Ask, Maria, et al.
(författare)
-
In-situ stress determination from breakouts in the Tornquist Fan, Denmark
- 1996
-
Ingår i: Terra Nova. - : Wiley. - 0954-4879 .- 1365-3121. ; 8:6, s. 575-584
-
Tidskriftsartikel (refereegranskat)abstract
- The Tornquist Fan, a fan-shaped region in Denmark and Western Baltic, is situated in the transition zone between the Western and Northern European Stress Provinces. Breakout data from 20 wells (0.3-3.6 km) were analysed. The fan can be divided into three stress provinces: (i) The area south of the Romo Fracture Zone is part of the Western European Stress Province and has NNW-SSE orientation of the maximum horizontal stress, (ii) The sediment cover in the Norwegian-Danish Basin is dominated by ENE-WSW orientated maximum horizontal stress, (iii) The maximum horizontal stress is sub-parallel to the strike of the Sorgenfrei-Tornquist Zone. Deviations from the regional stress field were observed in wells close to faults and salt diapirs. In wells south of the Sorgenfrei-Tornquist Zone, breakout occurrence decreases with increasing age of the stratigraphic units. The downhole breakout distribution seems to correlate with lithology and thickness of the sediment layer.
|
|
3. |
|
|
4. |
|
|
5. |
|
|
6. |
|
|
7. |
|
|