Method and device for combined measurement of rock sample resistivity and nuclear magnetic resonance during fluid displacement

Abstract

The invention relates to a method and a device for joint measurement of resistivity and nuclear magnetic resonance of rock samples during fluid displacement, including a core holder. The internal structure of the core holder is provided with a core plug and a non-magnetic electrode. A flow channel is arranged on the core plug, and a liquid conducting structure communicated with the flow channel is arranged on the non-magnetic electrode, and the non-magnetic electrode with electrical conductivity is used to realize the displacement of the medium during the nuclear magnetic detection process and the resistance detection at the same time, which solves the problem of the prior art. The problems of rock saturation and resistivity changes during the core displacement process cannot be accurately and real-time monitored, but the rock saturation, pore structure, fluid distribution and electrical parameter characteristics can be accurately and real-time measured during the displacement process.

Description

technical field [0001] The invention belongs to the field of petroleum and natural engineering, and relates to a method and a device for joint measurement of rock sample resistivity and nuclear magnetic resonance during fluid displacement. Background technique [0002] Saturation evaluation is the core task of quantitative evaluation of oil and gas reservoirs, and it is of great significance for reservoir evaluation and geological reserves calculation. According to the experimental research of rock electricity, Archie first introduced resistivity into the calculation of reservoir water saturation, and proposed the relationship between oil and gas layer resistivity and water saturation. This experiment requires real-time monitoring of rock resistivity as a function of fluid saturation during displacement. The measurement generally adopts the two-pole method, four-pole method, etc. to measure the resistivity, and it is necessary to add conductive electrodes at both ends of th...

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Problems solved by technology

[0008] Aiming at the problems existing in the above-mentioned prior art, the present invention discloses a method and device for joint measurement of rock sample resistivity and nuclear magnetic resonance in the process of fluid displacement, which solves the problem that the prior art cannot accurately and real-time monitor rock during core displacement. It can accurately and real-time measure the characteristics of rock saturation, pore structure, fluid distribution and electrical parameters during the displacement process.

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