Method for separating up and down propagating pressure and vertical velocity fields from pressure and three-axial motion sensors in towed streamers

摘要

A measured pressure field, a measured vertical velocity field, and two measured orthogonal horizontal velocity fields are obtained. A programmable computer is used to perform the following. A scaling factor is determined from water acoustic impedance, the measured pressure field, and the horizontal velocity fields. One of the measured pressure field and measured vertical velocity field is combined with one of the measured vertical velocity field scaled by the scaling factor and the measured pressure field scaled by the scaling factor, generating one of up-going and down-going pressure and velocity wavefields. 20 Obtain measured pressure field, vertical velocity field, and orthogonal horizontal velocity fields 21 Determine scaling factor from acoustic impedance, measured pressure field, and measured horizontal velocity fields 22 Scale one of measured pressure field and vertical velocity field by scaling factor Combine one of measured pressure field and 23- measured vertical velocity field with one of scaled vertical velocity field and scaled pressure field to generate one of up-going and down-going pressure and vertical velocity wavefields