Patent ID: 8693281
Filing Date: 2014-04-08
Classification: G01V

Abstract:
1. A method for performing a geophysical survey in a body of water to determine properties of subterranean features of the earth: moving one or more seismic sources through the body of water; activating the one or more seismic sources to generate seismic signals; moving a plurality of receivers through the body of water at at least two different depths, the at least two different depths comprising at least a shallow depth and a deep depth, wherein the deep depth is deeper in the body of water with respect to a surface of the body of water than the shallow depth, and wherein a shallow set of the plurality of receivers are moved through the water at the shallow depth and a deep set of the plurality of receivers are moved through the water at the deep depth; using the shallow set of receivers moved through the body of water at the shallow depth to record a shallow recorded signal set; using the deep set of receivers moved through the body of water at the deep depth to record a deep recorded signal set; muting all signals in the shallow recorded signal set having a frequency below a cross-over frequency to create a high frequency bandwidth; muting all signals in the deep recorded signal set having a frequency above a cross-over frequency to create a low frequency bandwidth; generating the geophysical data set by combining the high frequency bandwidth with the low frequency bandwidth; and using the geophysical data set to determine the properties of subterranean features of the earth.