Low-resistivity beds may produce water-free

Click here to enlarge imageTo analyze whether a zone will produce water-free from a low-resistivity formation, one can use several shaly sand models that correct log-indicated water saturations to obtain true formation water saturation.And if low resistivity is due to micro-porosity effects, nuclear magnetic resonance (NMR) logs will indicate if the formation will produce water-free.Low-resistivity readings can be caused by inclusion of clay or pyrite minerals and from microporosity. Clean oil-bearing sandstones have a high resistivity, but when this rock contains clay or heavy minerals such as pyrite, the resistivity can become low.The main problem with pyrite is to estimate its volume...

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