A clay distribution classification scheme was applied to a joint ultrasonic and resistivity datasets for shaly reservoir sandstones, allowing us to identify pore-filling and load-bearing shale and their effects on P- and S-wave velocity, attenuation and electrical resistivity at 60 MPa effective pressure. Reservoir sandstones with load-bearing shale form a distinct trend to clean and pore-filling shale sandstones in resistivity-velocity cross plots, and show decreasing attenuation with increasing resistivity. The results give useful information for improved hydrocarbon reservoir characterisation from joint property inversions.


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