天然热释光测量技术在多年冻土区天然气水合物勘查中的应用

doi:10.11720/wtyht.2024.1037

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Abstract

Since natural gas hydrates (NGHs) in permafrost areas feature complex formation mechanisms and multiple sources, there is an urgent need to develop multiple techniques for micro-leakage information capture in order to increase the exploration success rate. This study applied the natural thermoluminescence measurement technique to NGH exploration in a permafrost area for the first time. Specifically, it tested the thermoluminescence intensity in soil samples from the Muli permafrost area of the Qilian Mountains using an RGD-6 thermoluminescent dosimeter. Then, it summarized the heating procedure for NGH exploration in the area, as well as size fractions for sampling. The results show that the soil samples from the Muli permafrost area demonstrated optimal size fractions for sampling ranging from -60~100 meshes, an optimal heating rate of 5 ℃/s, and an optimal heating range of 50~400 ℃. Based on the anomaly characteristics of the natural thermoluminescence intensity in soil samples, this study determined the anomaly boundary of NGHs on the surface of the permafrost area. It revealed that the natural thermoluminescence intensity displayed anomalies on the top, which correspond well to the hydrocarbon anomaly mode. The natural thermoluminescence measurements of soil, unaffected by microorganisms and boasting high sensitivity, can be popularized as a promising method for NGH explorations in permafrost areas.

Key words： natural thermoluminescence size fraction temperature natural gas hydrate (NGH) permafrost area Qilian Mountains

Received: 30 January 2023 Published: 26 February 2024

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	Hui-Yan WANG
	Rui-Ling TANG
	Jing BI

Cite this article:

Hui-Yan WANG,Rui-Ling TANG,Jing BI. Application of natural thermoluminescence measurement technique in natural gas hydrate exploration in permafrost areas[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 24-30.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1037 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/24

Location of the study area (a) and sample point distribution (b) in Qilian Mountain

The changing curve of intensity of thermoluminescence with different particle size

The changing curve of intensity of thermoluminescence in different temperature intervals

The changing curve of intensity of thermoluminescence in different heating speed

Values of soil geochemical indications of the study area

Contour map of thermoluminescence in the permafrost region of Qilian Mountain

Contour map of acid extracted methane in the permafrost region of Qilian Mountain

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