Semblance plot

Oil and natural gas exploration -- geology and geophysics
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Mohamed

Semblance plot

Post by Mohamed »

Can somebody please explain to me what the semblance plot is (in a simple way, please :oops: ).

eric2009
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Re: Semblance plot

Post by eric2009 »

It looks like a tough question, no one has answered it.

Mohamed

Re: Semblance plot

Post by Mohamed »

eric2009 wrote:It looks like a tough question, no one has answered it.
When I received the E-mail notification about your reply, I was like "Uhh, finally some one has answered my question".

Simon
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Re: Semblance plot

Post by Simon »

I heard this term long time ago in a lecture, got a feeling that it sort of works like the migration in the GPR/seismic data -- make the picture clearer to identify features.

Mohamed

Re: Semblance plot

Post by Mohamed »

“The semblance plot is a hyperbolic Radon transform, in which the amplitudes are smoothed, scaled, and contoured to produce a visual display. This transformed display has axis of time and velocity that are used to identify the velocities for normal move-out (NMO) correction of the CMP gathers. The hyperbolic move-out energy from primary reflections, multiples, and mode converted energy is focused to a small local area on the semblance plot, with its peak defining the move-out velocity.” (Bancroft & Cao, 2004).

An example of a Semblance plot is shown below:
semblance_plot.gif
Tags: what, is, Semblance, plot.

Tyler
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Re: Semblance plot

Post by Tyler »

To make it simple: in order to do proper stacking of CMP gather of seismic reflection data, the 1D velocity model needs to be defined. The semblance plot is generated from the seismic data to visually help to generate the velocity model.

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