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Relationships among low frequency (2 Hz) electrical resistivity, porosity, clay content and permeability in reservoir sandstones
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Second International Workshop on Rock Physics, Aug 2013, cp-381-00018
Abstract
The improved interpretation of marine controlled source electromagnetic (CSEM) data requires knowledge of the inter-relationships between reservoir parameters and low frequency electrical resistivity. We found that sandstones with porosity higher than 9% and volumetric clay content up to 22% behave like clean sandstones and follow Archie’s law for a brine concentration of 35 g/l. By contrast, at this brine salinity, sandstones with porosity less than 9% and volumetric clay content above 10% behave like shaly sandstones with non-negligible grain surface conductivity. A negative, linear correlation was found between electrical resistivity and hydraulic permeability on a logarithmic scale. We also found good agreement between our experimental results and a clay pore blocking model based on pore-filling and load-bearing clay in a sand/clay mixture, variable (non-clay) cement fraction and a shaly sandstone resistivity model.