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Environments and tool options:
Since there are many different drilling environments and logging options, a brief discussion on the merits of different tools in different environments is warranted. The two basic mud environments have different tools that are suited best to them: Water Based: In conductive mud, the greatest variety of options is available to the logger. Electrical conductivity is easily measured in the borehole wall as the mud environment does not hinder the flow of electricity from the tool to the rock and back to the tool's receptors. In addition to dipmeter and electrical borehole images, acoustic borehole images can be generated for feature resolution in conductive muds.
Oil Based:
This environment is more restricting since normal electrical imaging tools
will not work through the non-conductive mud. The logger is left with the choice
of using an
acoustic image tool and/or a special
oil based electrical dipmeter.
The oil based dipmeter tends to provide a more concrete answer to questions about
structural bedding while the acoustic tool can both refine bedding results and
help determine fracture information.
Move your mouse over the highlighted words to view an example of each & click on them for a more detailed explanation.
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