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Deviation Surveys

A deviation survey is used to draw the path of a well bore on the Map view of your project and to properly position tops. In addition, a stick will be displayed on your seismic showing the path of the well bore in time. A checkshot survey is used to position the survey in time.

• To properly position top events along a deviated bore path, both in space and in depth, you must provide an actual deviated survey or enter values in the deviated survey table that meet their needs.
• WinPICS treats a well with no deviated survey information as a vertical well with posting and event locations for gridding done at the bottom hole location.

The ideal order of operations

1. Import Well-spots
2. Import Checkshot Surveys
3. Import Well TOPS
4. Import Well Surveys

If the well survey is imported after the checkshot file, the well time for the bore hole can be calculated during the import step. If this order is not followed you may manually calculate the time relationship using Survey Functions found in the Well-spot Database dialog.

File Formats

Two types of survey files can be imported. You can import all the values needed to define the survey or import only the basic data and compute survey values.

• Pre-computed Survey Files must contain Measured Depth, Inclination, Azimuth, TVD, X-Offset, Y-Offset, and Time.
• Basic data files must contain Measured Depth, Inclination, and Azimuth. WinPICS will calculate TVD, X-Offset, Y-Offset and Time (based on an associated Checkshot).
• Survey Functions will use the Measured depth, Inclination and Azimuth to compute survey values. If you wish to use imported values for TVD, X-Offset, and Y-Offset, do not Compute X,Y, Z. Similarly, if you wish to use imported values for Time, do not Compute Time.

What do you want to do?

• Learn about the well survey format