«Proceedings of Gubkin University»

Features of justifying the petrophysical model of water saturation in the productive deposits of the Tyumen formation

UDC: 553.98.041:552.578.2.061.4
DOI: -

Authors:

¹ LUKOIL-Engineering, Tyumen, Russian Federation
² Tyumen Industrial University, Tyumen, Russian Federation

Keywords: petrophysical model, electrical resistivity, oil saturation coefficient, residual water saturation, experiment, conditions, phase permeabilities, deposits of the Tyumen Formation

Annotation:

When studying the section of the Tyumen Formation, there are discrepancies between the data from special core studies and the results of interpreting well geophysical studies using the existing petrophysical model: the water saturation coefficient obtained from the specific electrical resistance and the relative phase permeabilities (RPF). The paper shows that the situation improves significantly when using a generalized dependence of the specific electrical resistance on the volume water saturation for calculating the oil saturation coefficient. The paper also examines the influence of the methods used to create residual water saturation in rocks on the behavior of the RPF curves and critical water saturations, as well as the influence of scale effects when using full-size samples and standard cylinders in the experiment. It has been established that in order to create an adequate petrophysical model, it is necessary to use the RPF obtained taking into account the full compliance of the initial conditions with the values of residual water saturation on a full-size core. In the case of a proven change in the wettability of the pore space, it is recommended to use samples with natural saturation in the experiments, which are made from cores taken using an isolating technology.

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