By Prof. Dr. Stefan M. Luthi (auth.)
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Extra resources for Geological Well Logs: Their Use in Reservoir Modeling
Sen PN, Goode PA, Sibbit AM 1988) Electrical conduction in clay bearing sandstones at low and high salinities. J Appl Physics 63: 4832 - 4840. Stewart G, Wittmann M (1979) Interpretation of the pressure response of the repeat formation tester. 54 th Ann Conf Soc Petr Eng: Paper 8362. Tixier MP (1949) Evaluation of permeability from electric-log resistivity gradients. Oil and Gas Jour (June 16, 1949) Waxman MH, Smits LJM (1968) Electrical conduction in oil-bearing shaly sands. J Soc Petr Eng 8: 107 - p2.
Very often, a combination of neutron, density, and acoustic logs is used to calculate the formation porosity, since this allows correcting for lithological effects. 6). The uninvaded resistivity R t is more difficult to obtain because all resistivity measurements are influenced by the resistivity of nearby layers and by the resistivity of the invaded zone in the immediate vicinity of the borehole wall. Generally, R t is calculated through a combination of shallow, medium and deep resistivities from induction or laterolog tools.
Well logging is primarily used for quantifying oil and water saturations. Additionally, numerous new nonpetrophysical logging methods are developed . • The reinvention phase (since 1985): Numerous technological breakthroughs such as logging-while-drilling, borehole imaging, and nuclear magnetic resonance redefine well logging as an important aid for efficient reservoir development and management. References Allaud LA, Martin M (1977) Schlumberger, history of a technique. John Wiley Sons, New York.