Method and device for detecting organic matter in rocks by low-field nuclear magnetic resonance
A technology of low-field nuclear magnetic resonance and detection methods, which is applied in the fields of analysis by nuclear magnetic resonance, measuring devices, and material analysis through resonance, and can solve problems such as low efficiency, inaccurate detection, and slow speed
Active Publication Date: 2017-12-26
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
[0005] The invention provides a method and device for detecting organic matter in rocks by low-field nuclear magnetic resonance, which are used to solve the problems of inaccurate detection, slow speed, and low efficiency in the prior art by using chemical analysis methods to analyze and detect organic matter in rocks
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[0050]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0051] figure 1 It is a flow chart of the low-field NMR rock organic matter detection method provided in Embodiment 1 of the present invention, figure 2 A schematic diagram of a first nuclear magnetic pulse sequence in the low-field nuclear magnetic resonance method for detecting organic matter in rocks provided by Embodiment 1 of the presen...
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The present invention provides a low field nuclear magnetic resonance (NMR) rock organic matter detection method and device, wherein the method is as follows: at least one first nuclear magnetic pulse sequence and at least one second nuclear magnetic pulse sequence are transmitted to a rock, the first nuclear magnetic pulse sequence timing sequence comprises at least one editing pulse and a collecting pulse for collecting a feedback signal, the editing pulse includes a first 90 degree pulse and a second 90 degree pulse which are opposite in phase, the collecting pulse is a third 90 degree pulse, the collecting pulse and the first 90 degree pulse are same in phase, and the second nuclear magnetic pulse sequence is a FID pulse sequence; received hydrogen nucleus in the rock are respectively analyzed according to a first feedback signal and a second feedback signal generated by the first nuclear magnetic pulse sequence and the second nuclear magnetic pulse sequence to obtain rock hydrogen nucleus relative content, the hydrogen nucleus relative content is used to characterize the organic matter content of the rock, the organic matter content of the rock can be more accurately detected, test speed is fast, and detection efficiency is high.
Description
technical field [0001] The invention relates to oil and gas resource exploration technology and nuclear magnetic resonance rock analysis technology, in particular to a low-field nuclear magnetic resonance rock organic matter detection method and device. Background technique [0002] With the continuous development of society and the increasing consumption of natural resources, rocks containing organic matter in the framework of shale reservoirs and tight sandstone reservoirs have been paid more and more attention as an important potential target layer. The mining and utilization of rocks with various organic matter, etc., all need to detect the content of organic matter in the rock. [0003] In the prior art, to analyze the organic matter content of various rocks in various places, it is necessary to break the rocks, and use chemical analysis methods such as burning method to detect and analyze the organic matter content. [0004] However, in the prior art, chemical analysi...
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IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 廖广志杜群杰肖立志李新朱明达
Owner CHINA UNIV OF PETROLEUM (BEIJING)