Muting according to set velocity value

Theory

The module is used to mute out any unwanted data from the seismic data like refractions, direct arrivals, noise etc. This method is worked by velocity along the seismic traces. It works dynamically by adjusting the mute curve based on seismic wave propagation velocities. Mute curve can be defined as

t(x) = \sqrt{{t_{0}}^2 + \frac{x^2}{v^2}}

Where

t(x) - Mute time at offset X

t0 - Mute time at offset Zero

x - Offset

V - Velocity

Input data

Input DataItem

Input gather

connect/reference to the input gather which needs to be muted by using velocity

Parameters

Offset-velocity-time table

based on the user defined offset, velocity and time parameters, the mute function will be calculated. Provide the triplet (Offset, velocity, time) values. If more than one mute curve function is required, simply click on and it will add additional triplet.

Mute Triplet

Offset

provide the offset value for calculating the mute function. By default, 0 meter

Time

provide the time value for calculating the mute function. By default, 0 ms

Velocity

 provide the velocity.

Velocity mute mode { Down, Up }

choose the mute application type.

Down - all of the data below the picked mute line will be zeroed

Up - all of the data above the picked mute line will be zeroed

Mute taper

taper helps in smooth transitioning of the seismic data to avoid any sharp edges at the muting zone.

Settings

Auto-connection

By default, TRUE(Checked).It will automatically connects to the next module. To avoid auto-connect, the user should uncheck this option.

Bad data values option { Fix, Notify, Continue }

This is applicable whenever there is a bad value or NaN (Not a Number) in the data. By default, Notify. While testing, it is good to opt as Notify option. Once we understand the root cause of it, the user can either choose the option Fix or Continue. In this way, the job won't stop/fail during the production.

Notify

It will notify the issue if there are any bad values or NaN. This is halt the workflow execution.

Fix

It will fix the bad values and continue executing the workflow.

Continue

This option will continue the execution of the workflow however if there are any bad values or NaN, it won't fix it.

Calculate difference

This option creates the difference display gather between input and output gathers. By default Unchecked. To create a difference, check the option.

Skip

By default, FALSE(Unchecked). This option helps to bypass the module from the workflow.

Output data

Output DataItem

Output gather

generates the output gather with user defined mute by velocity.

Gather of difference

generates the difference gather between the input gather vs output muted gather

Information

There is no information available for this module so the user can ignore it.

Examples

In this example workflow, Inner mute is applied by means of Mute by velocity module.

After parameters fixation, launch the Vista items of Mute by velocity module and look at the Input gather, there will be a velocity mute line appear on the Input gather.

As per the requirement of the input data, the user can adjust the triplet values and design the mute.

Actions

There are no action items available for this module so the user can ignore it.

Video lesson

YouTube video lesson, click here to open [VIDEO IN PROCESS...]

Related articles

Yilmaz. O., 1987, Seismic data processing: Society of Exploration Geophysicist

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