Method of processing vertical seismic profile data using effective vti models
AssigneeSchlumberger Technology Corporation
InventorScott Leaney
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Abstract
A method of applying an effective velocity model to vertical seismic profile (VSP) seismic data comprises correcting for offset using a non-hyperbolic effective velocity model so as to take account of the earth's layering and anisotropy. One preferred non-hyperbolic model for the relationship between offset and travel time is: formula (I) where t is the travel time of seismic energy from the source to the receiver, x is the offset between the source and the receiver, and z is the depth of the receiver.
Claims21
A method of processing offset vertical seismic profile (VSF) seismic data. comprising the step of correcting for the offset between the seismic source and the receiver using a non-hyperbolic effective velocity model, wherein the step of correcting for offset comprises transforming the path of seismic energy reflected by a reflector located at a depth zreflector greater than the depth of the receiver into a direct path to a receiver at an effective depth zeff, where zeff=zreceiver+2 (zreflector−zreceiver)
A method as claimed in any preceding claim and further comprising the step of computing the geometric spreading of the seismic data using the effective velocity model.
A method as claimed in any preceding claim wherein the VSP seismic data is walkaway seismic data.
Dependencies are inferred from the claim text.