A logging method and system based on formation electrical impedance

Abstract

The present invention relates to a logging method and system based on formation electrical impedance. The method includes measuring the target formation electrical impedance by means of a bridge method, sending the measured data to a ground receiving module for data storage and real-time display; Extract the resistivity information of the target strata, and use the resistivity as the equivalent pure sandstone formation resistivity of the formation, and use the Archie formula to determine the oil saturation of the argillaceous sandstone formation according to the equivalent pure sandstone formation resistivity. The present invention proposes a method for determining the oil saturation of the argillaceous sandstone formation by measuring the electrical impedance of the formation and using the Archie formula. Compared with the measurement by the coil method, it has the advantages of direct measurement, high precision, strong anti-interference ability, simple instrument, easy to manufacture, maintain and use The technical difficulty is small and other advantages.

Description

technical field [0001] The invention relates to the technical field of petroleum or geological survey, in particular to a logging method and system based on formation electrical impedance. Background technique [0002] Resistivity logging has a development history of more than 80 years, and it is currently the most mature technology, the largest scale, and the most widely used petroleum geophysical logging method. The birth of the Archie formula established the relationship between the resistivity of the reservoir and the oiliness, which made the resistivity logging get the attention of geologists and promoted the development of petroleum logging technology. However, the Archie formula is derived under the conditions of relatively uniform lithology, no shale, and relatively developed pores, so it is not effective for argillaceous sandstone reservoirs deposited in continental facies. For decades, log analysts have tried many methods when using the Archie formula in shaly san...

AI Technical Summary

Problems solved by technology

The difficulty of the problem lies in that most of these interpretation methods or models are based on regional geology, are empirical, and do not have universal significance; moreover, the parameters of some models are difficult to determine, such as the Waxman-Smith model and the “double Cation exchange capacity, ion mobility, near water, far water, specific surface area, etc. in the "water" model

The complex resistivity logging method developed in recent years tries to use the complex resistivity of rocks to solve the problem, but no interpretation model based on complex resistivity has been established yet;

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