Angle-dependent 4D seismic time-strain inversion for estimating subsurface thickness and velocity changes

Author:

Taweesintananon Kittinat1ORCID,Landrø Martin2ORCID,Narongsirikul Sirikarn3ORCID,Folstad Per Gunnar3ORCID

Affiliation:

1. Formerly NTNU – Norwegian University of Science and Technology, Acoustics Group, Department of Electronic Systems, Trondheim, Norway; formerly NTNU – Norwegian University of Science and Technology, Centre for Geophysical Forecasting, Trondheim, Norway and presently PTT Exploration and Production Public Company Limited (PTTEP), Bangkok, Thailand. (corresponding author)

2. NTNU – Norwegian University of Science and Technology, Acoustics Group, Department of Electronic Systems, Trondheim, Norway and NTNU – Norwegian University of Science and Technology, Centre for Geophysical Forecasting, Trondheim, Norway.

3. ConocoPhillips Norge, Tanager, Norway.

Abstract

In time-lapse (also called 4D) seismic analysis, the time shift of a certain seismic reflection event is caused by 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 linear relations between 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 in vertical transverse isotropic media from angle-dependent 4D seismic time strains. Through examples from synthetic and field data, we show that 4D thickness strains, velocity strains, and anisotropic parameter changes can be estimated simultaneously without prior knowledge about the 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 thickness and velocity strains are the fundamental components of most physical properties used in 4D seismic and geomechanics applications.

Funder

Norges Forskningsråd

Publisher

Society of Exploration Geophysicists

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