Effects of basement topography on subsidence history analysis

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Scientific paper

Tectonic subsidence history analyses performed without consideration of fault-controlled or other basement topography and interpreted using the depth-dependent extension model may yield very inaccurate estimates of crustal and subcrustal extension for sedimentary basins. Analyses of data from wells over local basement highs can lead to predictions of incorrectly low crustal extension and high subcrustal extension. Predictions based on data from wells over basement lows may be incorrect in the opposite sense. Calculating the sediment unloading correction assuming local-isostatic compensation, rather than flexural compensation, reduces this problem. This is not meant to indicate that depth-dependent extension does not occur, but that it should not be invoked simply to explain variations in basement depth due to rough topography.

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