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Top seal ductility estimation (view source)
Revision as of 22:24, 28 July 2014
, 22:24, 28 July 2014→Ductility-time plots
[[file:evaluating-top-and-fault-seal_fig10-37.png|300px|thumb|{{figure number|3}}Ductility-time plot for an Upper Jurassic top seal in the Central Graben, North Sea.]]
[[file:evaluating-top-and-fault-seal_fig10-37.png|300px|thumb|{{figure number|3}}Ductility-time plot for an Upper Jurassic top seal in the Central Graben, North Sea.]]
Ductility-time plots can be constructed from shale compaction curves and burial history curves. Burial history curves give the depth of burial of a top seal at a specific time. Shale compaction curves let us infer the shale density at a specific depth of burial and time.
Ductility-time plots can be constructed from shale compaction curves and [[Burial history chart|burial history curves]]. Burial history curves give the depth of burial of a top seal at a specific time. Shale compaction curves let us infer the shale density at a specific depth of burial and time.
[[:file:evaluating-top-and-fault-seal_fig10-37.png|Figure 3]] is a ductility-time plot for an Upper Jurassic top seal in the Central Graben, North Sea. The plot shows the paleodensity and inferred paleoductility during progressive burial of shales at the 141- and 151-m.y sequence boundaries. Prior to approximately 100 m.y, the Late Jurassic shale top seal had a density of 3 and was ductile. Strain prior to [[length::100 m]].y. would not contribute to seal risk. Any deformation occurring after [[length::100 m]].y. could have caused fracturing, given sufficiently high strains.
[[:file:evaluating-top-and-fault-seal_fig10-37.png|Figure 3]] is a ductility-time plot for an Upper Jurassic top seal in the Central Graben, North Sea. The plot shows the paleodensity and inferred paleoductility during progressive burial of shales at the 141- and 151-m.y sequence boundaries. Prior to approximately 100 m.y, the Late Jurassic shale top seal had a density of 3 and was ductile. Strain prior to [[length::100 m]].y. would not contribute to seal risk. Any deformation occurring after [[length::100 m]].y. could have caused fracturing, given sufficiently high strains.