We compare newly acquired laboratory data of P-wave velocity (Vp, 700 kHz) and electrical resistivity (expressed as apparent formation factor F, 80 Hz) on 24 carbonate samples with a range of porosities and permeabilities, to similar data for shaly sandstones. Crossplots of F - Vp, and the pressure sensitivity of the F - Vp relation, reveal similar trends for carbonates and sandstone, with the carbonates following closely, and extending, the clean sandstone trend. Unlike for shaly sandstones, the carbonate trends are only partly controlled by permeability. Other possible controls include heterogeneity, pore aspect ratio and size distribution.


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