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- W2018156686 abstract "ABSTRACT The Cation Exchange Capacity (CEC) of a formation is an important parameter for the correction of resistivity measurements in the calculation of water and hydrocarbon saturations. Clays in sands provide an electrical conductive path that is related to CEC. This conductivity is parallel and in addition to the conductivity obtained from the pore water. As a result, formations with clay minerals present will be less resistive than if they were the simple systems of quartz and fluids used in most models which are erroneously evaluated since the hydrocarbon saturation decreases. Normally, the only way of determining CEC is in the laboratory, but this way is expensive, and suffers from significant dispersion of results due to differences in laboratory effectiveness in cation replacement, removal of excess cation as well as possible interference. This paper describes the results obtained by calculating CEC from well logs, using the normalized Qv concept of the Juhasz equation. Qv is the cation exchange capacity per unit total pore volume and is calculated from the FDC/CNL and natural gamma ray spectral logging information. A very large and high quality log and laboratory data from low oil gravity shaly sands of the Orinoco Oil Belt was used in order to obtain accurate results. Laboratory measurements of CEC made in cores and sidewall cores, and CEC calculated from a geochemical model, show a remarkably good agreement with the continuous CEC log derived values." @default.
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- W2018156686 date "1990-10-14" @default.
- W2018156686 modified "2023-09-26" @default.
- W2018156686 title "Cation Exchange Capacity Data Derived from Well Logs" @default.
- W2018156686 doi "https://doi.org/10.2118/21097-ms" @default.
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