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Knowledge of the procedures and techniques currently used for rock and oil analysis will increase the qualityofinterpretations made on data generated.

There are two basic techniques used to measure porosity, permeability, and saturation data. One involves retorting or high temperatures and the other a distillation process. Specific procedures used in these analyses willvary depending on the formation type encountered. Formation types can be placed into one of three categories that will decide procedures used. These categories are consolidated, unconsolidated, and shale. Procedures also vary within these categories to accommodate conventional cores, sidewall cores, and drill cuttings samples.

The quality of data generated in the analysis for API oil gravity is dependent on both the source of the sample and the procedure used. Once an uncontaminated sample is obtained its API can be determined by refrac- tometer, float method, electronic densitometer, hydrometer, or pycnometer.

There are advantages and disadvantages to procedures used for both rock and oil analysis, which should be evaluated to accommodate the needs of the project.

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