Calculations of Fracture density attributes

[Tito Barca]

Dear All,

Greetings, 

I am a new user and i only have a free Opendetct version and I am trying to derive an attribute that has the same out put of Fracture density and proximity attributes using Petrel Software.

at least try to help me if you do not have an experience with Petrel by trying to link these two attributes to other common attributes.

[Paul de Groot]

Hi Tito,

As administrator of this group, I passed your first mail before you sent the 2nd one. I did not pass the 2nd one because I thought it was identical to the first. After re-reading the first mail (this one), I did not see a reference to Thinned Fault Likelihood, so the 2nd message was different albeit slightly.

Please correct me if I'm wrong but I believe that this is the situation:

1. You have computed TFL in Petrel
2. You have imported this TFL volume into OpendTect, where you want to compute Fracture Density and Fracture Proximity from TFL
3. You do not have access to Fracture Density and Fracture Proximity (and TFL) as these are part of our Faults & Fractures plugin.

So, the real question is: can you compute Fracture Density and Fracture Proximity in the free version? The answer is yes, you can do so via the Attribute Engine. 

Fracture Density is easy. You need to define a mathematics attribute to clip TFL above a certain threshold (TFL > C0? 1 : 0) where C0 is your threshold. Next you give this attribute as input to a Volume Statistic attribute where you specify the input (time-window is [0,0]; radius is defined by inline and crossline steps). The output of the Volume Statistics attribute is the Average (or Sum). You can test the parameters C0 and the step outs using the "Evaluate Attribute" utility in the Attribute Definition window.

Fracture Proximity is much more difficult and I'm not even sure it can be done in the Attribute Engine. Instead, you may want to consider renting the Geoscience Package for one day. 

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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