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Analysis of the gas hydrate accumulation condition in Quemocuo area of Qiangtang Basin |
ZHANG Shuai1, ZHU Youhai1, WANG Pingkang1, FU Xiugen2, WANG Dayong3, WU Xinhe1, PANG Shouji1, XIAO Rui1 |
1. Oil and Gas Survey, China Geological Survey, Beijing 100083, China; 2. Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China; 3. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China |
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Abstract Based on the survey results of QK-8 gas hydrate drilling test well and the clue of high hydrocarbon gas in Quemocuo area, the authors systematically analyzed the influence of permafrost thickness on natural gas hydrate accumulation, hydrocarbon source rocks characteristics, reservoir space, mitigation system and other geological factors, considering the geological factors affecting gas hydrate accumulation in permafrost regions. The potential of gas hydrate accumulation was also clarified. The results show that the thickness of permafrost is large (100 m). Hydrocarbon source rocks of Triassic have a overall performance of high abundance of organic matter, with kerogen type Ⅱ2 and higher maturity (Ro about 1.3%~1.5%). The reservoir space is mainly composed of cavity - fractured reservoirs, followed by fracture and pore types. It has an effective migration pathway and a good regional cap layer. At the same time, natural gas hydrate associated minerals such as calcite and pyrite were well developed in the multilayer sections. It is concluded that there is a certain potential for gas hydrate accumulation in Quemocuo area after comprehensive analysis, which is the main direction for the comprehensive energy resources investigation of the gas hydrate petroleum system.
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Received: 09 July 2020
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