Description

By using this module, the user can able to merge two depth velocities using horizon in ASCII format.

In this following example, we are going to show how it works.

Module involved

Read seismic traces

Read seismic traces

Merge depth velocities  

In the below images, on the left hand side, we read two velocity models using Read seismic traces module. On the right hand side, we have imported the input horizon file in ASCII format which is overlaid on both the velocity models.

Now we want to merge the two input velocity models based on the horizon. Execute the Merge depth velocities module after assigning the input data items and appropriate parameters as per the input datasets. The output of the merged depth velocity model with different taper lengths (100 ms & 500 ms) are shown below.

Input data

Depth velocity top

Provide the input depth velocity model to be considered as top

Depth velocity bottom

Provide the input depth velocity model to be considered as bottom

Parameters

Horizon shift

If the user wants to shift the horizon to a constant value, provide the shift value in time (ms).

Taper

Provide the taper value for the horizon. When both the velocity models are merged together, the taper will make the transition smooth depending on the taper value.

Datum

Datum value will automatically detected from the input data.

Number of time samples

Provide the total number of samples for creating the time average and interval velocity models.

Dt

Provide the Delta T for creating the time average and interval velocity models.

V0

Provide the replacement/near surface velocity as per the project value.

Import horizons from ASCII params

Currently it is supported in ASCII format with Tab delimited. The horizon file should have X Y & time (ms).

Location

Define the position of the horizon file. We have two options here. Datum & Topography

If the horizon is at Datum then the user should select the Datum option and provide the datum value in the next option

If the horizon is at Topography level then the user should select the Topography option.

Datum

Provide the datum value

Time measure

This related to horizon. By default milliseconds. Otherwise the user can drop choose between milliseconds and seconds.

Add constant shift time

The user shift shift the horizon with a constant shift time.

Map interpolation

This interpolation is related to horizon.

Interpolation step X

Horizon interpolation step size in X direction.

Interpolation step Y

Horizon interpolation step size in Y direction.

Output data

Depth velocity top avg

Average depth velocity model of top velocity model or 1st input

Depth velocity bottom avg

Average depth velocity model of bottom velocity model or 2nd input

Time velocity top avg

This is the average time velocity model of the top velocity model or 1st input

Time velocity bottom avg

This is the average time velocity model of the bottom velocity model or 2nd input

Merged velocity average

Final merged average velocity model

Merged velocity interval

Final merged interval velocity model

Custom actions

These are the action items menu for the user to perform additional activities. Here we have two options

Import horizon ASCII

Import the horizon file in ASCII format

Clear horizon

In case the user wants to clear/remove the horizon they can use this option to clear/remove the horizon.