ABSTRACT

The MicroLog is an instrument for the accurate determination of the boundaries of permiable beds, and it also makes possible the evaluation of porosity in many instances. The MicroLog is futhermore a help in the determination of fluid saturation.

To this effect, appropriate interpretation charts are used, wherein the values recorded on the MicroLog opposite a porous bed are entered on one side, and the corresponding values of the porosity and of the formation factor are read on the other side.

This method has proved accurate in the case of unconsolidated formations of high porosity and with a small content of conductive solids. Reasonable results are also obtained in consolidated formations of medium porosity. Although good results are sometimes given by the MicroLog in hard formations, a better accuracy should be expected in this case from the application of a different method, the MicroLaterlog, which is just being now introduced in the field.

The correction for the presence of conductive solids on the porosity determinations are now being studied, and only approximate and provisory data are available at the present time.

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