SYSTEM FOR ATTENUATION OF WATER BOTTOM MULTIPLES IN SEISMIC DATA RECORDED BY PRESSURE SENSORS AND PARTICLE MOTION SENSORS

摘要

An up-going wavefield and a down-going wavefield are calculated at a sensorposition from a pressure sensor signal and a particle motion sensor signal(43, 44). Then, an up-going wavefield is calculated at a water bottom positionsubstantially without water bottom multiples from the up-going and down-goingwavefields at the sensor position. In one embodiment, the up-going wavefieldat the sensor position is backward propagated to the water bottom, resultingin an up-going wavefield at the water bottom (45). The down-going wavefield atthe sensor position is forward propagated to the water bottom, resulting in adown-going wavefield at the water bottom (46). The up-going wavefield at thewater bottom without water bottom multiples is calculated from the backwardpropagated up-going wavefield at the water bottom, the forward propagated down-going wavefield at the water bottom, and a reflection coefficient of the waterbottom (48).