4.3.14 Import Wells
Well data in OpendTect is organized into four sub-categories: well tracks, well logs, markers (well tops) and time-depth models. Each category can be imported via Survey > Import > Wells menu:
- ASCII: single well import.
- Simple Multi-Well: simple multi-well import of vertical wells.
- Bulk: multi-well import.
- VSP (SEG-Y):import of zero-offset VSP data.
Alternatively, import (and editing) of well data is available from the Manage Wells window (Survey > Manage > Manage Wells):
- Import button in Well Track
, Checkshot
, Depth/Time Model
and Markers
editors allows to import these tables from ASCII files.
- Import... button below Log list allows to import well logs from LAS files.
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Reference datums used in OpendTect are schematically shown in the figure below:
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Well depths in OpendTect are always referenced using their Measured Depth (MD). The alignment with seismic data is done using well track data (deviation survey) and time-depth (and/or checkshot) data. The well track data provides the relation between lateral coordinates, True Vertical Depth Sub Sea (TVDSS) and MD values. The time-depth data provides the relation between MD and Two Way Times (TWT).