A new method of petroleum well logging

TL;DR

This paper introduces a novel electrical impedance logging technique for shaly sand reservoirs, enabling quantitative oil saturation assessment by analyzing resistivity from impedance measurements, supported by theoretical and experimental research.

Contribution

It presents a new electrical impedance logging method tailored for shaly sands, linking impedance data to oil saturation estimation using Archie's law.

Findings

Resistivity from impedance correlates with pure sandstone resistivity.

Impedance-based resistivity can be directly used in Archie's law.

Method validated through theoretical and petrophysical experiments.

Abstract

This paper presents a new petroleum well logging method - electrical impedance logging for shaly sand reservoirs - through theoretical and petrophysical experimental research. Electrical impedance logging measures the electrical impedance of shaly sand reservoirs, extracts resistivity information from the real part, and uses it to determine the oil saturation of the reservoir quantitatively. The study shows that the resistivity, extracted from the real part of the electrical impedance in shaly sands, has characteristics similar to those of the pure sandstone formation resistivity and can be directly used in Archie's law for oil-bearing interpretation of reservoirs.