What is it about?
In a 4D seismic analysis, the time-shift of a certain seismic reflection event is caused by the changes in the seismic velocity and the depth of the corresponding reflector. An interpretation of 4D seismic time-shifts is normally simplified by neglecting thickness changes (strains) or assuming a linear relation between thickness and velocity strains. This paper goes beyond these assumptions and proposes a least-squares optimization method to simultaneously estimate the thickness and velocity strains in anisotropic media from angle-dependent 4D seismic time strains. The computation is done without prior knowledge about the stress behavior and geomechanics in the survey area.
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Why is it important?
Applied to synthetic and field seismic data, 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.
Read the Original
This page is a summary of: Angle-dependent 4D seismic time-strain inversion for estimating subsurface thickness and velocity changes, Geophysics, January 2024, Society of Exploration Geophysicists,
DOI: 10.1190/geo2023-0357.1.
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