Move-out correction of seismic data

摘要

A method of processing seismic data including measurement data and their gradients to obtain gradients of move-out corrected data, comprising deriving gradients of the measurement data, deriving a first term comprising applying a move-out correction function to the measurement data; deriving a second term by applying the move-out correction function to the gradients and deriving gradients of move-out corrected data by adding the first term and the second term. The gradients of move-out corrected data are used to process physical properties of the earth's interior. The method may be used prior to any data processing algorithm which uses measurement gradient data in which move-out correction is applied prior to the algorithm, either because the algorithm makes a zero offset assumption or because it is beneficial for the algorithm to operate on move-out corrected data to reduce aliasing.

主权项

1. A processor implemented method for processing seismic data including measurement data and gradients of the measurement data for a geophysical survey, comprising:
receiving the measurement data from a plurality of seismic receivers, the plurality of seismic receivers are arranged along a seismic streamer configured in use to be towed behind a boat through a body of water and the plurality of seismic streamers comprise geophones and/or hydrophones, and wherein the receivers are configured to measure seismic energy generated by an interaction between a seismic signal produced by a seismic source and a subterranean section of the earth; using a non-transitory computer readable medium containing computer instructions stored therein, for causing a computer processor to perform the following processes:
deriving gradients of the measurement data;deriving a first term by applying a move-out correction function to the measurement data, wherein the move-out correction function is configured to compensate for offset between the seismic source and the seismic receivers and comprises a velocity function selected to match a velocity of the seismic energy traveling through the earth and the body of water;deriving a second term by applying the move-out correction function to the gradients; andderiving gradients of move-out corrected data by adding the first term and the second term.