Accumulation model and exploration and development suggestions of coal measure gas hydrates in Sanlutian area of Muli Coalfield, Qinghai Province

Authors

CAO Daiyong, College of Geoscience & Surveying Engineering, China University of Mining & Technology(Beijing), Beijing 100083, ChinaFollow
QIN Rongfang, College of Geoscience & Surveying Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China
WANG Anmin, College of Geoscience & Surveying Engineering, China University of Mining & Technology(Beijing), Beijing 100083, ChinaFollow
CHEN Limin, Beijing Urban Construction Group Co. Ltd., Beijing 100088, China
LI Jing, Shanxi Institute of Energy, Taiyuan 030604, China
WEI Yingchun, College of Geoscience & Surveying Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China

Abstract

The Natural Gas Hydrate(NGH) is known as the most promising strategic resource in the 21st century because of its huge energy density, convenient use, high combustion value, and cleanness, and it is an alternative energy source with huge potential for conventional oil and gas resources. The occurrence of the NGH in the Sanlutian area of Muli Coalfield in Qinghai Province is the result of the interaction between the abundant gas sources and the hydrate stability zone in cold highland areas. The NGH in coal-bearing strata is defined as the coal measure gas hydrate, belonging to unconventional coal measure gases. To find out its close connection with coal measures and its metallogenic specialization, the accumulation conditions of the NGH are studied, and proposals for the exploration and development of the NGH are put forward in this paper. The results show that the NGH in coal measures in the Sanlutian area of Muli Coalfield is characterized by both coal-type gases and oil-type gases, and the enrichment layers are concentrated in the upper part of Jiangcang Formation of the middle Jurassic in the temperature-pressure stable zone. The reservoirs of the NGH can be divided into “fracture type”, “fracture + pore type” and “pore type”, of which the proportion are 65.22% 26.08% and 8.70%, respectively. Based on the present tectonic pattern, the Sanlutian area is divided into eight blocks, and the favorable enrichment areas of NGH are the M₁, S₁ and S₂ blocks with the development of reverse faults, low dip angle of strata, and medium to low fracture density. The accumulation mode of the NGH in coal measures in the Sanlutian area is established, that is, imbricate fan structure and frozen soil zone plugging type. The mixed gas source filling, short-distance migration, and tectonic trap are favorable factors for the NGH accumulation. Finally, with the coal measure NGH in the study area as an example, the basic characteristics of the terrestrial coal measure NGH are summarized, and three stages of the exploration and development of the NGH in the permafrost area in China are proposed. It is considered that co-exploration and mining is an inevitable way to develop the NGH in coal measures.

Funding Information

10.12363/issn.1001-1986.21.12.0809

Keywords

natural gas hydrate, accumulation model, exploration and development, unconventional natural gas, Sanlutian Area in Muli Coalfield

Recommended Citation

CAO Daiyong, QIN Rongfang, WANG Anmin, et al. (2022) "Accumulation model and exploration and development suggestions of coal measure gas hydrates in Sanlutian area of Muli Coalfield, Qinghai Province," Coal Geology & Exploration: Vol. 50: Iss. 3, Article 10.
Available at: https://cge.researchcommons.org/journal/vol50/iss3/10

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