Velocity Model from wells

[Luis Rivera]

Before saying anything, I’m grateful to anyone who takes their time to answer this post.

I have 2D seismic lines, wells, 2D and 3D regional horizons. Wells are tied to seismic and some of them have checkshots and Depth/Time models.

In this context, I’d like to generate a velocity volume between 3D horizons using well’s velocity data. Theoretically, by assigning a velocity to an interval between horizons, I might find what I’m looking for. Hence my question is: does Opendtect has an option to generate a velocity model or volume using wells and horizons?

Perhaps the plugin “Velocity Model Building” allows me to create a velocity volume, but both of its options (vertical and horizon based velocity analysis) need prestack data which I do not have (Figure 1). Volume Building gave me the option to create a velocity gridder (which I believe is, perhaps, a grid of velocities) but wells are not a valid input (Figure 2).

 Figure 1.

 Figure 2.

For anyone who asks, I would like to have all the data in the same domain for further activities, hence I need this velocity volume to convert seismic’s time domain into depth domain.  Further research brought me to the options displayed in Figure 3, but this output seems to be only for display. Besides, the velocity volume is also an input of this process.

 

Figure 3.

Perhaps the conversion of well’s domain is easier than convert the seismic?

 

I apologize for the long message like.

 Thanks for your guidance!

[Paul de Groot]

Dear Luis,

You are looking for the "Well Log Interpolator" option in the Volume Builder. Select the "Interpolate along Horizon" option and select the horizons and the wells you want to interpolate. Applying this setup will create a velocity model that is used to convert data on-the-fly in a depth scene, or in a batch model in the Processing menu. 

Best regards,

Paul.

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Paul de Groot

Geoscience Manager

-----------------------------------------------------------------------------------------------------------------------   dGB Earth Sciences
Phone: +31 53 4315155 E-mail: paul.d...@dgbes.com Internet: dgbes.com

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[Luis Rivera]

Dear Paul,

I'm very grateful for your response. I have to arrange the data before applying the suggested workflow, but this will likely work for me. The depth/time model in each well is not a valid input, but I believe I have a solution for that.

Thank you very much for replying.

Best regards,

Luis.