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Method and device for distinguishing components of nuclear magnetic resonance organic shale

A technology of nuclear magnetic resonance and shale, applied in the direction of analysis by nuclear magnetic resonance, etc., can solve the problems of inability to distinguish organic shale, complex nuclear magnetic resonance response, etc.

Active Publication Date: 2017-11-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method and device for distinguishing organic shale components by low-field nuclear magnetic resonance, which is used to solve the problem that the signals of organic matter and pore fluid are mixed together to present an extremely complex nuclear magnetic resonance response in the prior art, which cannot be realized for organic shale. The distinction of fluid components

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  • Method and device for distinguishing components of nuclear magnetic resonance organic shale
  • Method and device for distinguishing components of nuclear magnetic resonance organic shale
  • Method and device for distinguishing components of nuclear magnetic resonance organic shale

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Embodiment 1

[0021] figure 1 It is a flow chart of the NMR organic shale component differentiation method provided by the embodiment of the present invention, and the implementation subject of this embodiment is the NMR instrument. Before introducing the differentiation method provided in this example, briefly introduce the application background of this method. The shale in this example includes not only unsealed cores obtained by conventional coring methods at normal temperature and pressure, but also mineralized rocks. For shale cores saturated with water, oil or hydrocarbons, before performing the method of this embodiment, some pretreatment processes are required, that is, before sending the NMR pulse sequence to the shale, it is necessary to apply a magnetic field to the shale , put shale into the probe of the nuclear magnetic resonance instrument, and the probe magnet generates a magnetic field, wherein the Larmor frequency of the hydrogen nucleus is generally less than or equal to ...

Embodiment 2

[0037] This embodiment is a further explanation of the above embodiments. image 3 It is a flow chart of the method for distinguishing components of NMR organic shale provided by another embodiment of the present invention, such as image 3 As shown, the method for distinguishing the components of the NMR organic shale includes:

[0038] Step 201, sending at least one nuclear magnetic pulse sequence to the shale, the nuclear magnetic pulse sequence is used to interact with hydrogen nuclei in the shale, wherein the nuclear magnetic pulse sequence sequentially includes: a first editing pulse, a second editing pulse and an acquisition pulse in sequence , wherein the first editing pulse includes a first 90-degree pulse and a second 90-degree pulse, the phases of the first 90-degree pulse and the second 90-degree pulse are opposite, and the second editing pulse includes: a third 90-degree pulse and a fourth 90-degree pulse pulse, the phase of the third 90-degree pulse and the four...

Embodiment 3

[0050] This embodiment provides a device for distinguishing components of NMR organic shale, which is used to implement the method for distinguishing components of NMR organic shale in the above embodiment, Figure 5 A schematic structural diagram of a component separation device for nuclear magnetic resonance organic shale provided in another embodiment of the present invention, as shown in Figure 5 As shown, the NMR organic shale component distinguishing device includes: sending

[0051] module 501 , acquisition module 502 and inversion module 503 .

[0052] Wherein, the sending module 501 is used to send at least one nuclear magnetic pulse sequence to the shale, and the nuclear magnetic pulse sequence is used to interact with the hydrogen nuclei in the shale, wherein, the nuclear magnetic pulse sequence sequentially includes: the first editing pulse and the The acquisition pulse of the feedback signal, wherein the first editing pulse includes a first 90-degree pulse and a...

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Abstract

The present invention provides a method and device for distinguishing components of NMR organic shale, wherein the method includes: sending at least one nuclear magnetic pulse sequence to the shale, the nuclear magnetic pulse sequence is used to interact with the hydrogen nuclei in the shale, and the nuclear magnetic pulse sequence The sequence sequentially includes the first editing pulse and the acquisition pulse used to acquire the feedback signal in order to obtain the feedback signal of the NMR pulse sequence emitted by the hydrogen nuclei in the shale; invert the relaxation spectrum of the hydrogen nuclei in the shale according to the feedback signal . In the method and device for distinguishing NMR organic shale components of the present invention, since the first editing pulse includes two 90-degree pulses with a phase difference of 180 degrees, the feedback signal of hydrogen nuclei in the organic matter components in the shale skeleton is suppressed , the feedback signal only includes the feedback signal of fluid hydrogen nuclei, and then according to the inversion of the feedback signal, the relaxation spectrum of hydrogen nuclei in the fluid in shale is obtained, which avoids the indistinguishable mixing of the feedback signals of hydrogen nuclei in organic matter and pore fluid. question.

Description

technical field [0001] The invention relates to rock analysis technology, in particular to a nuclear magnetic resonance organic shale component differentiation method and device. Background technique [0002] Since Bloch of Stanford University and Purcell of Harvard University discovered the phenomenon of nuclear magnetic resonance in 1946, it has become a widely used analytical testing tool in the fields of physics, chemistry, biology, and medicine, and has formed NMR spectroscopy and magnetic resonance. resonance imaging. [0003] The application of nuclear magnetic resonance in rock physics is mainly to obtain relevant information such as the relaxation time of rock physical properties by studying the nuclear magnetic resonance response of porous medium rocks. For a long time, conventional reservoirs have been the main object of nuclear magnetic resonance rock physics research, and their skeletons are mainly composed of rock-forming minerals, which do not contain hydroge...

Claims

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Application Information

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IPC IPC(8): G01N24/08
Inventor 廖广志肖立志杜群杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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