While measurements for single minerals like Quartz, Calcite, Feldspars, and Oxides are reported and well documented, the properties of composite rocks are rarely measured. Common practice to obtain the rock grain or mineral modulus, which is required for most fluid substitution methods, is to use the results of the XRD (X-ray diffraction) analysis and apply a Voigt or Hill average. In this study several samples with varying mineral composition have been tested to identify the influence of mineral composition on the grain modulus of these rocks. The measured grain modulus can vary substantially from the calculated Voigt-Reuss bounds. In some cases, the clay fraction appears to have a strong influence (Rim SS). On the other hand, when stiff framework minerals are present such as siderite, clays have a small apparent influence on the average grain modulus
Ronny Hofmann received a M.Sc. degree and a PhD in Geophysics from the Colorado School of Mines. Currently he is working in the Exploration Research Team at Shell International E&P. He is interested in rock physics and its application to reservoir characterization and time-lapse seismic. Recently he has been working on properties of shales and shale gas.
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