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This Windows-based program is designed for both structural and stratigraphic interpretation of dips from dip logs or formation imagers. Requires Windows XP or later. The network version will run on Windows and Novell servers.
One may ask "isn't it enough just to color the dip patterns?" The answer is almost always "no", because dips are 3-D entities and pattern-coloring is essentially a 2-D exercise. As the applets below will demonstrate, the presence of even moderate structural tilt can completely change the configuration of dips such that the standard explanations for color patterning are no longer valid. In addition, scatter in dip measurements can obscure smaller, more subtle patterns, while at the same time introducing spurious patterns. In the applets that follow, you can interactively examine the effects of rotation and scatter on interpretation and explore some methods used in RDA to overcome these problems.
Others may ask "I can see the rocks clearly on my formation-imaging log, what will the extracted dips show me that the image will not?" Again, the problem is that borehole images are 2-D representations while extracted dips are 3-D. Anyone who chooses to ignore the dips is ignoring valuable structural and stratigraphic information.
Rotation for removal of structural tilt is an essential part of dipmeter analysis. Before viewing the applets below, you can get an explanation of rotation in "A Simple Example of Structural Tilt and Rotation".
In the examples below, click on the hyperlinks to view the applets. It is recommended that they be viewed in order.
There are two related examples demonstrating the need for rotation and how to apply it. First, "The Effects of Structural Tilt" shows what happens to dip patterns when structural tilt is imposed on a section. Second, "Removal of Structural Tilt" shows how to undo the effects of structural tilt, by use of rotation, in order to objectively examine dip patterns.
Nearly all dip logs have some amount of scatter. The scatter can interact with tilt to interfere with interpretation. "Interaction of Scatter and Tilt" demonstrates how these two phenomena can affect interpretation. One aid in interpreting scattered dip data is smoothing, demonstrated in "Smoothing Dips to Reduce Scatter." Another useful method for interpretation of scattered data is synthetic deviation.
If you would like more detailed explanations of some of the techniques used in RDA, you can download a technical document (327KB) as a self-extracting executable of a Microsoft Word document.
In the list below are some plots created within the RDA program. The plots below have been exported and inserted into Microsoft Word documents.
Many of the interpretation features in RDA are not even available on workstation programs at many times the cost. Contact address--USA and International: firstname.lastname@example.org Canada and UK: Andy@MooseOils.com
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Changes last made on: 11/29/15 10:46 AM