The resistivity measurement forms one of the pillars of open hole logging, and assists greatly in the understanding of the hydrocarbons that may be present in the reservoir. A log of the resistivity of the formation is expressed in ohm-m. The resistivity can take a wide range of values, and therefore, for convenience is usually presented on a logarithmic scale form, for example, 0.2 to 2000 ohm-m. The resistivity log is fundamental in formation evaluation because hydrocarbons do not conduct electricity while all formation waters do. Therefore, a large difference exists between the resistivity of rocks filled with hydrocarbons and those filled with formation water. Clay minerals and a few other minerals, such as pyrite, also conduct electricity, and reduce the difference. Some measurement devices, such as induction logs, may respond more directly to conductivity, but are presented in resistivity.
Probe has designed and engineered reliable cost-effective tools and associated ancillary equipment, to facilitate resistivity measurements for over 90% of all well types.
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