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.

Reference datums used in OpendTect are schematically shown in the figure below:

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).