This paper describes an approach for analysis of shaly sands and a program for TI-59 calculators based on the theory of the neutron-density crossplot. The program calculates porosity, flushed zone water saturation, and amounts of dispersed, laminar and structural shale. Also, formation water saturation is determined using three shale models. The most appropriate value can then be selected according to the relative amounts of the shale types.

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