Rweq VS ESSP and Rweq VS Rw and Formation Temperature (SP-1 & SP-2)

Rweq Determination from ESSP (SP-1)

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Rweq versus Rw and Formation Temperature (SP-2)

This chart is used to convert equivalent water resistivity (Rweq) from Chart SP-1 to actual water resistivity (Rw). It can also be used to convert the mud filtrate resistivity (Rmf) to the equivalent mud filtrate resistivity (Rmfeq) in saline mud.

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Resistivity of NaCl Water Solutions (Gen-6)

This chart has a twofold purpose. The first is to determine the resistivity of an equivalent NaCl concentration (from Chart Gen-4) at a specific temperature. The second is to provide a transition of resistivity at a specific temperature to another temperature. The solution resistivity value and temperature at which the value was determined are used to approximate the NaCl ppm concentration.

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Estimation of Formation Temperature with Depth (Gen-2)

This chart has a twofold purpose. First, a geothermal gradient can be assumed by entering the depth and a recorded temperature at that depth. Second, for an assumed geothermal gradient, if the temperature is known at one depth in the well, the temperature at another depth in the well can be determined.

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