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Line 29: − Figure 10-44 shows that the pore pressure is close to the fracture pressure at the base of the top seal (approximately [[depth::1300 ft]]). The pore pressure is inferred from mud weight and RFT measurements (solid dots). Leak-off tests (LOT) help constrain the fracture pressure. The fracture pressure is close to the lithostatic pressure or overburden pressure.+ − − [[file:evaluating-top-and-fault-seal_fig10-44.png|thumb|{{figure number|10-44}}. Copyright: Esso Exploration and Production, U.K.]]
Natural hydraulic fracturing example, North Sea (view source)
Revision as of 19:45, 13 February 2014
, 19:45, 13 February 2014→Evidence
==Evidence==
==Evidence==
[[file:evaluating-top-and-fault-seal_fig10-44.png|thumb|{{figure number|1}}. Copyright: Esso Exploration and Production, U.K.]]
Evidence for hydraulic fracturing and seal rupture include the following:
Evidence for hydraulic fracturing and seal rupture include the following:
* Cores show vertical, open extension fractures rather than the more common shear fractures found in adjacent fields. These fractures are identical to fractures produced by hydraulic fracturing.
* Cores show vertical, open extension fractures rather than the more common shear fractures found in adjacent fields. These fractures are identical to fractures produced by hydraulic fracturing.
[[:file:evaluating-top-and-fault-seal_fig10-44.png|Figure 1]] shows that the pore pressure is close to the fracture pressure at the base of the top seal (approximately [[depth::1300 ft]]). The pore pressure is inferred from mud weight and RFT measurements (solid dots). Leak-off tests (LOT) help constrain the fracture pressure. The fracture pressure is close to the lithostatic pressure or overburden pressure.
==See also==
==See also==