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Elastic Impedance Equation based on the Incident-angle Approximation and Inversion
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition incorporating EUROPEC 2012, Jun 2012, cp-293-00072
- ISBN: 978-90-73834-27-9
Abstract
The use of elastic impedance data contributes to the development of seiemic inversion and improves the understanding of the geology. However, when the Aki-Richards approximation is used to calculate the PP wave reflection coefficient, the incident angle is usually used as the angle parameter of the equation instead of the average of the incident and refracted angle. This calculation brings errors not only to the result of the PP wave reflection coefficient, but also to the Connolly Elastic Impedance which is derived from the Aki-Richards approximation, especially when the difference between the elastic parameters of the sand and shale layers is large. The Incident-Angle approximation is the function of the incident angle, which significantly reduces the errors. This paper proposes a method, named the Incident-Angle Elastic Impedance based on the Incident-Angle approximation to make the inversion of elastic impedance more accurate. Test of a 2D model and the application of real data in East China show that the elastic impedance equation based on the Incident-Angle approximation is feasible and precise.