Depth Conversion With Petrosys





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Uploaded on Sep 1, 2011

Discover how you can effectively perform different depth conversions - integrating several data sources - using Petrosys' industry-trusted techniques and methods.

Convert initial time models to depth using regional velocity knowledge, taking into account more reliable well velocities where available. The first velocity information available usually takes the form of stacking velocities derived from processing of the seismic survey.

In Petrosys you can load stacking velocities and interpolate interval and average velocities to the interpreted time horizons. Using this initial velocity model you can do vertical time to depth conversion both on the original seismic time picks as well as on regional surface models.

Stacking velocities are generally a very crude form of information, and Petrosys' numerous grid smoothing and editing functions, along with the ability to tailor layer-by-layer depth conversion workflows, allow generation of conservative models with a range of options to illustrate the sensitivity of your structure to variations in the velocity model.

As soon as well data becomes available, time-depth curves can be introduced to calibrate the velocity model. Petrosys automatically creates average and interval velocities to formations with specified tops in the well data file. Well based velocities can be used to calibrate the stacking velocity field through the well tie function.

Tie the seismic depth model to formation picks to lock down the absolute depth at well tracks, creating the surface that your geoscientists can justify.

The velocity based depth model gives a good representation of the regional structure based on the seismic interpretation.

Formation picks, once available, can then be used to accurately tie this depth model to well data.

Well tracks and formation picks can be accessed directly from your OpenWorks, GeoFrame, IHS Kingdom, Petra or PPDM data store, or they can be imported or loaded into the Petrosys well data file for off-line use.

The Petrosys well tie function uses the wide range of Petrosys gridding methods to balance the difference between well based formation picks and the seismic depth model. In addition to the popular minimum curvature method, kriging or geostatistics is particularly effective for creating a smoothly varying conservative depth correction without unnecessarily extrapolating errors.

By quality controlling your depth correction in Petrosys map and 3D views, you can identify and re-interpret spurious picks. The Petrosys well selection editing list makes it easy to exclude wells with data errors.

To model formations and other zones that aren't identified in the seismic interpretation, the grid phantoming operation allows interpolation of surfaces within the existing model.


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