NMR relaxation semaphore calibrating device and method for aquo-complex sediment by combining X-CT technology

Abstract

The invention discloses an NMR relaxation semaphore calibrating device and method for an aquo-complex sediment by combining an X-CT technology. The device comprises a reaction kettle, an NMR testing system, an X-CT scanning system, an aquo-complex synthesizing system, a temperature pressure control system and a vacuumizing saturated system. The vacuumizing saturated system is connected to the reaction kettle for vaccumizing saturated treatment of the sediment in the reaction kettle. The NMR testing system and the X-CT scanning system are used for scanning and testing microporous structures ofthe aquo-complex sediment and analyzing the behavior characteristics of the aquo-complex sediment in pore scale in the forming and decomposing processes. By means of the device, calibration of nuclearmagnetism transverse relaxation semaphore and the behavior measurement and analysis in the pore scale can be integrated, thereby laying a technical foundation for discussing a micromechanism of basicphysical parameter change of the aquo-complex sediment.

Description

technical field [0001] The invention relates to the field of basic physical property testing of unconventional oil and gas reservoir engineering and geotechnical engineering, in particular to a device and method for calibrating NMR relaxation signal quantities of hydrate deposits combined with X-CT technology. Background technique [0002] Gas hydrates are widely distributed in deep ocean strata and permafrost strata. Due to their huge reserves, high energy density, and clean and pollution-free properties, they are considered to be an important potential alternative energy source. [0003] However, the harsh natural environment, variable reservoir properties and complex phase transition process make the exploration and development of hydrates more difficult than conventional oil and gas, and commercial exploitation has more severe environmental and technical problems. At present, it is recognized that the most environmentally friendly and effective method of mining is the de...

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Problems solved by technology

[0004] NMR technology is one of the important means to study the pore-scale behavior characteristics of rock-soil porous media materials. Through multi-exponential fitting and inversion of the original echo series, basic information such as porosity and pore size distribution of porous media materials can be obtained, which is often used To study the seepage characteristics of porous media materials, and the pore behavior of hydrate-containing sediments is more complicated than that of conventional rock-soil porous media materials. Neither capillary pressure measurement nor isothermal adsorption method can be applied to the calibration of the NMR relaxation signal of hydrate-containing sediments, and the uncalibrated NMR testing technology cannot accurately reflect the characteristics of pore structure changes and their Effect on Transport Properties

[0005] The prior art discloses a low-field nuclear magnetic resonance multi-probe quantitative testing system and method for hydrates, but the same sample is not calibrated, and the formation of hydrates is random, which leads to the inconsistency of the sediment structure and affects the nuclear magnetic signal. Quantity Calibration

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