What is it about?
In a time-lapse (also called 4D) seismic analysis, the time-shift of a certain event is caused by the changes in the seismic velocity and the depth of the event. An interpretation of 4D time-shifts is normally simplified by neglecting displacement changes (strains) or assuming a linear relation of thickness and velocity strains. Here we go beyond these assumptions and propose a least-squares optimization method to simultaneously estimate the thickness and velocity strains from angle-variant 4D seismic time strains.
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Why is it important?
Through examples from synthetic and field data, we show that the 4D thickness strains and velocity strains can be estimated simultaneously without prior knowledge in geomechanics of the survey area. Our time-strain inversion method can be applied to any other 4D seismic data set in which angle-stack images are available. We see that our method has high potential in many other applications, because the thickness and velocity strains are the fundamental components of most physical properties used in 4D seismic and geomechanics applications.
Perspectives
In our understandings, we are among the first researchers who propose to estimate the thickness and velocity changes independently using 4D seismic analysis based on time-shifts alone.
Kittinat Taweesintananon
PTT Exploration and Production Public Company Ltd
Read the Original
This page is a summary of: Angle-Variant 4D Seismic Time-Shift Analysis for Velocity Change and Subsurface Strain Estimation, January 2022, EAGE Publications,
DOI: 10.3997/2214-4609.202210437.
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