The existence of a large number of closed pores in coal reservoirs may have an important impact on the storage of coalbed methane, and the quantitative characterization of closed pores will be of great significance. To this end, it is necessary to explore a new method that can simultaneously analyze various types of pores in coal.
The NMR freeze-thaw method (NMR method) is a method for measuring the phase transition of a liquid in a pore using a nuclear magnetic resonance technique and characterizing the pore size distribution of a porous material by the Gibbs-Thomson equation. The method is applicable to pore structure testing of various porous materials, such as catalysis, filtration, adsorption materials, building materials, ceramic materials, human body and biomimetic materials, and the pore diameter test range is 2 to 1000 nm.
The following is a brief introduction to the changes in water signal volume during ice melting to analyze the pore structure characteristics of coal.
The pore development of the tested coal samples is closely related to the degree of coalification, indicating that the degree of coal metamorphism caused by coalification has a significant impact on pore development. With the increase of metamorphism, the total pore volume of NMRC shows a trend of “reducing first and then increasingâ€, which is related to the trend of “first decrease and then increase†of coal rock porosity with the increase of coal rock metamorphism. Consistent.
The figure below shows the results of coal sample NMRC pore size distribution:
References: “Pore Testing of Coal Based on Nuclear Magnetic Freeze-Thaw Technology†Oil and Gas Geology Volume 37, Number 1
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