Geophysical research: article

Influence of intergranular and fractured porosity on the electrical resistivity of reservoirs of the Chayandinsky field (Eastern Siberia)
V.S. Zhukov
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Journal: Geophysical research
Tome: 23
Number: 2
Year: 2022
Pages: 5-17
UDK: 550.83; 38.53.19
DOI: 10.21455/gr2022.2-1
Full text
Keywords: rock, porosity, fracture porosity, intergranular porosity, electrical resistivity, formation factor
Аnnotation: The results of laboratory studies of the influence of intergranular and fractured porosity of the reservoirs of the Chayandinsky field (Eastern Siberia) on the electrical resistivity and the formation factor under conditions simulating reservoir conditions are presented. It is shown that with an increase in the intergranular and total porosity of rocks, the electrical resistivity also decreases. No reliable statistical dependence was found for fracture porosity. When the fracture porosity of the studied rock samples is 0.2 or more of the total porosity, their electrical conductivity is practically determined by the electrical conductivity of the fractures. It is revealed that the cementation index in the Archie–Dakhnov equation is related to the value of fracture porosity, and for the studied samples in the case of interconnected fractures it is 1.00, and in the presence of only intergranular porosity is equal to 2.36. The difference in the influence of intergranular and fracture porosities on the electrical resistivity of rocks and the formation factor is shown. The effect of intergranular porosity is well described by the Archie–Dakhnov equation. The presence of an interconnected fracture porosity is approximated by a special case of the Aguilera equation. The obtained values of intergranular and fracture porosity indicate that the fracture porosity of the studied samples consists of cracks that are weakly interconnected. For the real values of intergranular and fracture porosity of the studied rock samples, the formation factors are calculated using the Archie–Dakhnov and Aguilera equations, which describe adequately the dependences of the formation factor on the porosity of rocks and can be used both for calculating hydrocarbon reserves and for designing the field development process.
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