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Net exhumation estimation from seismic traveltimes and burial history modelling in the Western Barents Sea.

Martinez Guzman, Ricardo Jose
Master thesis
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URI
http://hdl.handle.net/11250/2492144
Date
2018
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  • Institutt for geovitenskap og petroleum [2169]
Abstract
A new seismically based technique is proposed for the estimation of net exhumation

magnitudes in sedimentary basin areas. The method uses traveltimes mapped from well

log data or pre-stack seismic data, starting from the seabed, on a reference area with only

subsidence, and from an area suspected to be uplifted. The method is compaction-based,

and allows for estimating net exhumation magnitudes at areas where severe uplift and

erosion prevent the usage of the shale compaction depth-trend technique. The technique

considers the similarity between the stratigraphic sequences from reference and uplifted

areas in terms of their NMO parameters and velocity heterogeneity. Linear P-wave velocity

functions are then estimated for both areas using dix-type mathematical relations,

and compared in a depth dependent scheme. Three sets of net exhumation magnitudes

were estimated by applying the method in nine wells spread across the Western Barents

Sea. The net exhumation magnitudes increases from the west and southwest where minor

or no uplift is predicted, towards the East and North-East, where exhumation magnitudes

between 800 m and 1700 m are estimated. Compared to the shale compaction technique,

the method is considered to be less affected by abnormal pore pressure development. The

estimates are in agreement with published net uplift magnitudes derived from shale compaction

and thermal maturity techniques, petrographical and sedimentological analysis,

etc. The net exhumation magnitudes were further used in the construction of burial history

curves for simulating mechanical and chemical compaction in clean sandstones. The

modelling scheme successfully predicts the quartz cement volumes quantified in petrographic

analysis, and the porosity, rock moduli, and velocities measured by wireline well

logging. The P-wave velocity proved to be the property least affected by factors outside

the model. The property modelling appeared to be most sensitive to the maximum temperatures

achieved according to the net exhumation magnitudes. Further empirical evidence

regarding the quality of the net uplift estimates is provided by positive correlation of the

exhumation estimates with present-day differential stress profiles. Moreover, the velocity

of exhumation-corrected Barents Sea sandstones is in agreement with published mechanical

and chemical compaction velocity depth trends, derived for unexhumed sandstones

from the Norwegian and North Sea.
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NTNU

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