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Quantitative evaluation method for generating efficiency of natural gas hydrate in rocks on basis of low field nuclear magnetic resonance

A low-field nuclear magnetic resonance and hydrate generation technology, which can be used in analysis by nuclear magnetic resonance, material analysis by resonance, and measurement devices. It can solve problems such as few reports and achieve the effect of improving detection efficiency.

Inactive Publication Date: 2018-11-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, there are few reports on the generation efficiency of gas hydrate in rocks

Method used

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  • Quantitative evaluation method for generating efficiency of natural gas hydrate in rocks on basis of low field nuclear magnetic resonance
  • Quantitative evaluation method for generating efficiency of natural gas hydrate in rocks on basis of low field nuclear magnetic resonance
  • Quantitative evaluation method for generating efficiency of natural gas hydrate in rocks on basis of low field nuclear magnetic resonance

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Embodiment Construction

[0020] Since the generation efficiency of gas hydrate in rocks is closely related to the estimation of gas hydrate reserves, the formulation of exploration and production plans, the present invention establishes a quantitative evaluation method for the generation efficiency of gas hydrates that has nothing to do with the properties of the skeleton. Provide an effective basis for the estimation of gas hydrate reserves, the formulation of exploration and development plans, and the reduction of exploration costs.

[0021] This method inverts them into T 2 Spectrum, and find T 2 Spectrum area; comparing rocks in different states T 2 Quantitative evaluation of gas hydrate formation efficiency can be realized by the difference of spectral area.

[0022] A method for quantitatively evaluating the formation efficiency of natural gas hydrate in rocks based on low-field nuclear magnetic resonance, specifically comprising the following steps:

[0023] (1) Process the rock into a plung...

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Abstract

The invention discloses a quantitative evaluation method for the generating efficiency of natural gas hydrate in rocks on the basis of low field nuclear magnetic resonance. According to the method, the advantage that the low field nuclear magnetic resonance is sensitive to a hydrogenous fluid and insensitive to a hydrogenous solid in the rocks is fully used, transverse relaxation signals of complete water-bearing rocks and natural gas hydrate contained rocks are measured, and transverse relaxation signals are converted to be T2 spectrums by adopting a regularized inversion algorithm, the areasof the T2 spectrums are respectively calculated, and the generating efficiency of natural gas hydrate in rocks can be determined according to changes of the areas of the T2 spectrums. The quantitative evaluation method provided by the invention can effectively overcome the defect, in the prior art, of low accuracy caused by that the saturability of the natural gas hydrate is formerly used for evaluating natural gas hydrate in seabed rocks, effectively improves the natural gas hydrate detection efficiency, and has an important significance on quantitative evaluation and prediction of natural gas hydrate quantity.

Description

technical field [0001] The invention belongs to the field of geophysical logging, in particular to a method for quantitatively evaluating the formation efficiency of natural gas hydrate in rocks based on low-field nuclear magnetic resonance. Background technique [0002] As a clean new energy source, natural gas hydrate has always been a research hotspot in industry and academia. The effective detection and development of seabed natural gas hydrate has also been a long-standing problem. Based on field coring and well logging data, predecessors summarized many logging response characteristics of gas hydrate-bearing rock formations, and made useful explorations for the identification of gas hydrate. However, there are few reports on the generation efficiency of gas hydrate in rocks. [0003] The rise of low-field nuclear magnetic resonance technology provides vitality for energy exploration and development. Since the NMR signal is only related to the hydrogen-containing flui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 葛新民范宜仁刘建宇杨波胡法龙李潮流
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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