Inversion-based horizon trackers - Post 1 of 2

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Inversion-based horizon trackers aim to minimize the error between dips computed from the inverted horizon-grid and from the measured seismic data (Steering Cube).

These trackers have two main advantages over conventional amplitude / similarity trackers:

  1. the inverted horizon grids are continuous, hence no holes need to be filled, and
  2. they do not suffer from loop-skips; thus, no editing is required.

If an inversion-based horizon does not pass the interpreter’s QC criteria, the process is simply repeated after the interpreter added more control points (seeds) that need to be honored.

The process of picking seeds, running the inversion, QC-ing the result and repeating the process (see video) is in general faster than conventional tracking with editing and gridding.

OpendTect’s Dip-steering plugin supports two inversion-based horizon trackers, called: “Inversion” and “Inversion+”. The “Inversion” algorithm operates only on dip. This algorithm is ideally suited for tracking unconformities. “Inversion+” is a hybrid algorithm that is designed to stay on the loop of the first seed. The picks are snapped to an event and the algorithm tries.

For more information please read our article in Interpretation Journal: Rahul Gogia, Raman Singh, Paul de Groot., Gupta, H., Srirangarajan, S., Phirani, J. and Ranu, S. [2020]. Tracking 3D Horizons with a New, Hybrid Tracking Algorithm. Interpretation Journal, Nov. 2020.

Next week I will be posting about using the HorizonCube to visualize and extract Geological Information.

#OpendTect #seismic #inversion #geology #geophysics

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