AUTOMATIC THREE-LAYER,THREE-DIMENSIONAL DECONVOLUTION OF THE PAYS DE BRAY ANTICLINE* |
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Authors: | E ALESSANDRELLO M BICHARA J LAKSHMANAN |
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Abstract: | Gravity data have been transformed into a three-layer, three-dimensional model by using an automatic procedure based on linear filtering. The Bouguer anomaly is first transformed by linear filtering into density variations located between two planes 1100 and 2500 m deep. These densities are then transformed into thicknesses with a constant density contrast of 0.4 g/cm3 with two geological constraints for the second and third interface: —minimum at 2500 m depth; —maximum below a variable limit given by geology. This gives the contact between the second and third layer. Differences between measured and computed gravity are then applied by a similar procedure to a layer located between depths of 0 and 500 m, giving the contact between the first and second layer. Interesting secondary anticlines and transverse faults are shown by various structural maps. |
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