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Corrections dynamiques et analyse de vitesse - liamg

Corrections dynamiques et analyse de vitesse - liamg

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Introduction<br />

Correction NMO<br />

Un réflecteur plat<br />

Couches horizontales<br />

Distorsion<br />

Réflecteur incliné<br />

Analyse <strong>de</strong> <strong>vitesse</strong><br />

Introduction<br />

Correction DMO<br />

Principes<br />

Calcul <strong>de</strong> la<br />

correction DMO<br />

DMO dans le<br />

domaine f –k<br />

Influence <strong>de</strong> la <strong>vitesse</strong><br />

Distorsion (NMO str<strong>et</strong>ching)<br />

Amplitu<strong>de</strong><br />

Amplitu<strong>de</strong><br />

2<br />

1<br />

0<br />

−1<br />

x(t)<br />

−2<br />

0 0.1 0.2 0.3 0.4 0.5<br />

Temps [s]<br />

0.6 0.7 0.8 0.9 1<br />

2<br />

1<br />

0<br />

−1<br />

y(t 0 )<br />

−2<br />

0 0.1 0.2 0.3 0.4 0.5<br />

Temps [s]<br />

0.6 0.7 0.8 0.9 1<br />

x(t) → correction NMO → y(t0) ;<br />

x(t) = cos(2πfct) ;<br />

<br />

y(t0) = cos 2πfc t2 <br />

0 .<br />

+ x2<br />

v 2

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