Import onshore 3D data from Petrel to OpenDtect

[j.fo...@gmail.com]

First of all I don’t have the Petrel Link.

 

I have received a 3D data set in depth plus exports of horizons and faults interpretation.

 

The survey ranges are as below. The regional datum is 1294 m which is expressed as -1294m above mean sea level. This above seal level is negative and below sea level is positive.

 

The horizon and fault data is in X,Y and Z format eg.

-27642.2

-3112840

471.6359

 

It appears that when I import the fault and horizon data, I have to multiply the Z-values by -1 to match it to the  Z-values of the seismic data.

 

Is that correct?

 

From what I have seen on images it appears that Petrel is expressing depth above seal level as positive and OpenDect expresses depths above sea level as negative.

 

Is that correct

 

Jordaan

 

 

 

Jordaan Fouche

Portion 11

Van Reenen Country Estate

Van Reenen

3372

Republic of South Africa

 

Tel: +27 (0)82 555 4227

 

[Paul de Groot]

Hi Jordaan,

It appears that when I import the fault and horizon data, I have to multiply the Z-values by -1 to match it to the  Z-values of the seismic data.

Is that correct?

I can't say as I do not know what was done to your horizons If the imported horizons match the seismic data, I would not worry about this.

 

From what I have seen on images it appears that Petrel is expressing depth above seal level as positive and OpenDect expresses depths above sea level as negative.

Is that correct?

For OpendTect this is correct. I do not know Petrel's conventions. For OpendTect's conventions, please see the cartoon in the user documentation (Chapter 4.3.14 Import Wells).

Best regards,

Paul.

--

Paul de Groot

Special Adviser

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

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