Comparison of velocities obtained from real VSP, with those obtained from acoustic logging data combined together with the modeling VSP gathers, allows the detection of zones of abnormal absorption (shown by a green arrow), where modeling velocities are higher than the real VSP velocities.

Comparison of real VSP velocities, with those obtained from acoustic logging data; Well 2 black sea shelf: a - Velocity model; b - modeled VSP gathers; b - Interval Velocities graph Vvsp (1 - Red line) and Vacoustic (2 - Green line).

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