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A simple geometric model of sedimentary rock to connect transfer and acoustic properties |
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| Authors: | Gabor Korvin Klavdia Oleschko Abdulazeez Abdulraheem |
| Institution: | 1. Earth Sciences Department and Reservoir Characterization Research Group, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia 2. Centro de Geociencias, Universidad Nacional Autónoma de México (UNAM), Km. 15.5 Carretera Querétaro-San Luis Potosí, C. P. 76230, Juriquilla, Querétaro, Mexico 3. Petroleum Engineering Department, King Fahd University, Dhahran, Saudi Arabia |
| Abstract: | A simple rock model is presented which reproduces the measured hydraulic and electric transport properties of sedimentary rocks and connects these properties with each other, as well as with the acoustic propagation velocities and elastic moduli. The model has four geometric parameters (average coordination number Z of the pores, average pore radius r, average distance between nearest pores d, and average throat radius δ) which can be directly determined from the measured porosity Φ, hydraulic permeability k, and cementation exponent m of the rock via simple analytic expressions. Inversion examples are presented for published sandstone data, and for cores taken from Saudi Arabian, Upper Jurassic and Permian carbonate reservoirs. For sandstone, the inversion works perfectly; for carbonates, the derived rock model shows order-of-magnitude agreement with the structure seen in thin sections. Inverting the equations, we express the transfer properties Φ, k, and m as functions of r, d, δ, and Z. Formulae are derived for the bulk density D b, formation factor F, and P-wave velocity in terms of the proposed geometrical parameters. |
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