Understand 4D Detectability

What is 4D detectability? In the second of a three-part series on towed-streamer 4D seismic, Andrew Long reviews the foundations to the enhanced detection of subtle 4D signals in broadband seismic data. (PGS 2021)

The seismic expression of changes to the physical state of a reservoir during depletion can be highly variable. If the ‘4D signal’ is weak, the repeatability of acquisition geometry must be stricter and additional care must be taken during processing and imaging. Broadband 4D methods can greatly improve signal detectability. New methods are also necessary to quantify the frequency-dependent metrics used to guide processing flows. Examples are given of 4D warping results: subtle time-shifts, significantly less than the sampling interval, can be detected with high spatial resolution.

Viewers should be familiar with the seismic method and have an interest in the monitoring of reservoir production using seismic data. Basic knowledge of seismic processing is recommended.

Topic: What is 4D Detectability? | Speaker: Andrew Long, PGS | Duration: 15 minutes

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