| 摘要 |
Methods for the determination of clay types and/or clay volumes of an earth formation are disclosed. Information as to the hydroxyl type of the clay minerals is obtained from the difference between an epithermal (or thermal) neutron porosity measurement and a density porosity measurement, and information as to the relative volume fractions of the clays is obtained by cross plotting this porosity difference against the thermal neutron macroscopic capture cross section of the formation. Additional indicators of clay type, e.g., the potassium, iron and boron content of the minerals, may be used to further distinguish between clays, particularly where the intrinsic capture cross sections of different clays are similar.
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