Logging system and method for measuring true resistivity of stratum based on electric field

Abstract

The invention discloses a logging system and method for measuring true resistivity of a stratum based on an electric field. The logging system comprises a downhole measurement mechanism and an acquisition data analysis mechanism, the acquisition data analysis mechanism comprises a ground mobile data acquisition mechanism and a data processing module, a wellbore is placed in a logging well excavated to a measurement stratum, the downhole measurement mechanism descends to the measurement formation in the wellbore, the ground mobile data acquisition mechanism is connected to the downhole measurement mechanism through a cable, and a wellhead is equipped with a cable hoisting device, and the downhole measurement mechanism is composed of a measurement coil and an electric field measurement maincontrol system. The method is based on the detection and data processing technology under the condition of the full-space multi-frequency emission and multi-point reception measurement stratum electric field, by obtaining massive electric field data, distribution of electric field intensity measured along a well axis is quickly achieved, the electric field intensity distribution is converted intoan apparent conductivity function, and by adaptively processing the apparent conductivity function, rapid measurement of different radial true stratum resistivity under the high signal-to-noise ratiocondition is achieved.

Description

technical field [0001] The invention relates to well logging technology, in particular to a well logging system and method for measuring formation true resistivity based on electric field. Background technique [0002] In the field of petroleum engineering, the true formation resistivity is a very important electrical parameter in oilfield reservoir evaluation. At present, the resistivity logging tool mainly uses the logging method of electromagnetic wave induction logging geometric factor theory, and measures the formation resistivity through multiple transmitting coils and receiving coil systems. In order to measure the medium resistivity in different radial and vertical directions of the formation, the domestic array induction logging tool MIT and the array induction logging tool AIT of Schlumberger, based on the geometric factor theory of electromagnetic wave induction logging, adopt a set of emission from short to long, There are more radial and longitudinal repetitive...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a logging system and method for measuring the true resistivity of the formation based on the electric field to solve the problem that the data processing of the formation true resistivity measurement in the above-mentioned prior art is complex and cannot meet the needs of obtaining different radial depth information. The logging system uses a high-performance integrated transmitter circuit to transmit electric field signals of 5 different frequencies, and through the data acquisition system, collects and receives 8 groups of axial positions of 5 kinds of frequencies in the borehole and measures the electric field distribution signals along the well axis

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