A method for simultaneous determination of adsorbed and free methane in shale
A measurement method and adsorption state technology, which is applied in the field of analysis and measurement, can solve problems such as large errors, limited pressure sensor accuracy, and inability to change real-time dynamic adsorption state methane
Active Publication Date: 2019-06-28
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology
[0003] The current method for measuring the alkane adsorption capacity of shale mainly refers to the national standard "GB / T 19560-2008 Coal High Pressure Isothermal Adsorption Test Method". Requirements for accurate characterization of adsorbed gas under high temperature and high pressure
Moreover, it is not possible to quantify the change of adsorbed methane during the methane adsorption / desorption process in real time.
It is even more impossible to detect the change of non-adsorbed methane in shale
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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0057] On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.
[0058] In the first embodiment of the present invention, a method for simultaneously measuring adsorbe...
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The invention relates to the technical field of assay determination, and specifically relates to a measurement method for simultaneously measuring adsorbed-state and free-state methane in shale. According to the method, based on a low-field nuclear magnetic resonance technology, a nuclear magnetism T2 spectrum of methane in a shale sample is obtained, the marking conversion formula of nuclear magnetism signal amplitude and the quantity of a methane substance and the marking conversion formula of adsorbed-state methane and nuclear magnetism signal amplitude are obtained through calculation, low-field nuclear magnetic resonance is carried out on other shale samples, the marking conversion formulas of adsorbed-state and free-state methane are applied, and the quantities of the adsorbed-state and free-state methane in the adsorption / desorption process of the other shale samples are obtained. According to the measurement method, the quantities of adsorbed-state and free-state methane substances in shale at any time node can be dynamically detected in real time, and then the method is high in measurement speed and simple in operation and is extremely applicable for simultaneously measuring adsorbed-state and free-state methane in shale when the scales are the quantities of different states of methane in shale.
Description
technical field [0001] The invention relates to the technical field of analysis and measurement, in particular to a method for simultaneously measuring adsorbed and free methane in shale. Background technique [0002] In the prior art, shale gas is mainly stored in shale in the adsorbed state and free state, and a small amount is dissolved in pore fluid. Accurate and quantitative determination of methane in different states in shale is of great significance for shale reservoir evaluation, shale gas reserve estimation and development effect evaluation. [0003] The current method for measuring the alkane adsorption capacity of shale mainly refers to the national standard "GB / T 19560-2008 Coal High Pressure Isothermal Adsorption Test Method". Accurate characterization of adsorbed gas under high temperature and pressure. Moreover, it is impossible to quantify the change of adsorbed methane in the process of methane adsorption / desorption in real time and dynamically. It is ev...
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IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor姚艳斌刘军孙晓晓郑司建
OwnerCHINA UNIV OF GEOSCIENCES (BEIJING)