Device and method for computing depth velocity variations

摘要

Method, computer device and software for calculating a corrected temporal variation (dt1)depth or a corrected relative temporal variation (dt1/t1)depth of a first body wave based on a second body wave. The method includes receiving raw seismic data recorded with a receiver; calculating arrival-time variations for the first and second body waves; calculating first and second relative temporal variations for the first and second body waves; and correcting the first relative temporal variation based on the second relative temporal variation to obtain the corrected relative temporal variation or correcting the first temporal variation based on the second temporal variation to obtain the corrected temporal variation. A body wave is a wave that experiences at least one reflection before being recorded by the receiver.

主权项

1. A method for calculating in a computing device a corrected temporal variation (dt1)depth or a corrected relative temporal variation (dt1/t1)depth of a first body wave based on a second body wave, the method comprising:
receiving raw seismic data recorded with a receiver, wherein the raw seismic data includes recordings for the first and second body waves at various times; calculating a first arrival-time variation (dt1) for the first body wave, wherein the first arrival-time variation (dt1) is obtained by comparing a travel-time of the first body wave recorded at a first time (t1) with a first reference travel-time associated with the first body wave; calculating a second arrival-time variation (dt2) for the second body wave, wherein the second arrival-time variation (dt2) is obtained by comparing a travel-time of the second body wave recorded at a second time (t2) with a second reference travel-time associated with the second body wave; calculating a first relative temporal variation (dt1/t1) for the first body wave based on the first arrival-time variation (dt1), wherein the first relative temporal variation (dt1/t1) is a ratio between the first arrival-time variation (dt1) and the first time (t1); calculating a second relative temporal variation (dt2/t2) for the second body wave based on the second arrival-time variation (dt2)), wherein the second relative temporal variation (dt2/t2) is a ratio between the second arrival-time variation (dt2) and the second time (t2) different from the first time (t1); and correcting with the computing device the first relative temporal variation (dt1/t1) based on the second relative temporal variation (dt2/t2) to obtain the corrected relative temporal variation (dt1/t1)depth, or correcting the first arrival-time variation (dt1) based on the second arrival-time variation (dt2) to obtain the corrected temporal variation (dt1)depth; and monitoring changes in a target present in a substrate based on the corrected relative temporal variation (dt1/t1)depth or the corrected temporal variation (dt1)depth, wherein a body wave is a wave that experiences at least one reflection before being recorded by the receiver.