| 羌塘盆地雀莫错地区天然气水合物成藏条件分析 |
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| 作者姓名： | 张帅 祝有海 王平康 付修根 王大勇 伍新和 庞守吉 肖睿 |
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| 作者单位： | 1.中国地质调查局油气资源调查中心,北京 100083; 2.中国地质调查局成都地质调查中心,成都 610081; 3.中国地质科学院地球物理地球化学研究所,廊坊 065000 |
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| 基金项目： | 中国地质调查局“陆域天然气水合物资源综合调查(编号: DD20190102)”项目资助 |
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| 摘 要： | 基于天然气水合物钻探试验井QK-8井的调查成果,以雀莫错地区发现的高烃类气体显示为线索,从影响高山冻土区天然气水合物成藏的关键地质因素出发,系统分析了影响天然气水合物成藏的冻土厚度、烃源岩特征、储集空间、疏导系统、矿物特征及盖层条件等地质因素,明确了该区天然气水合物成藏潜力。结果显示: 雀莫错地区冻土厚度较大(约100 m); 上三叠统主力烃源岩整体表现为有机质丰度高,为Ⅱ2型干酪根,成熟度较高(Ro为1.3%~1.5%); 储集空间以缝洞型储层为主,裂隙、孔隙型次之; 具备有效的运移通道和良好的区域盖层,同时多层段发育方解石和黄铁矿等天然气水合物伴生矿物。综合分析认为,雀莫错地区具有一定的天然气水合物成藏潜力,是下一步天然气水合物含油气系统综合能源资源调查的主要方向。
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| 关 键 词： | 天然气水合物 成藏条件 储集空间 疏导系统 雀莫错地区 羌塘盆地 |
| 收稿时间： | 2020-07-09 |
Analysis of the gas hydrate accumulation condition in Quemocuo area of Qiangtang Basin |
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| Authors: | ZHANG Shuai ZHU Youhai WANG Pingkang FU Xiugen WANG Dayong WU Xinhe PANG Shouji XIAO Rui |
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| Institution: | 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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| Keywords: | natural gas hydrate accumulation conditions reservoir space mitigation system Quemocuo area Qiangtang Basin |
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