Changes

* '''Geological setting''', which may include structural or stratigraphic dip, facies characteristics, and reservoir heterogeneities

* '''Geological setting''', which may include structural or stratigraphic dip, facies characteristics, and reservoir heterogeneities

The basic open hole wireline logging devices can be divided into four general groups, as shown in Table 1. The ''correlation and lithology'' devices are used primarily to correlate between wells and to discriminate reservoir from nonreservoir rocks. The ''resistivity'' devices are used to determine formation resistivity at varying distances from the wellbore, which is used for correlation and the determination of water saturation. The ''lithology and porosity'' devices are used to determine both lithology and porosity. A variety of ''auxiliary'' tools are used to make special logging measurements. (For more on tool specifications, see [[Basic tool table]])

The basic open hole wireline logging devices can be divided into four general groups, as shown in Table 1. The ''correlation and lithology'' devices are used primarily to correlate between wells and to discriminate reservoir from nonreservoir rocks. The ''resistivity'' devices are used to determine formation resistivity at varying distances from the wellbore, which is used for correlation and the determination of water saturation. The ''lithology and porosity'' devices are used to determine both lithology and porosity. A variety of ''auxiliary'' tools are used to make special logging measurements. (For more on tool specifications, see [[Basic tool table]].)

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