| 六盘山盆地页岩吸附气赋存条件及其影响因素 |
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| 引用本文： | 韩伟,艾宁,李玉宏,张云鹏,郭望.六盘山盆地页岩吸附气赋存条件及其影响因素[J].石油实验地质,2019,41(1):127-133. |
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| 作者姓名： | 韩伟 艾宁 李玉宏 张云鹏 郭望 |
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| 作者单位： | 1. 中国地质调查局 西安地质调查中心, 自然资源部 岩浆作用成矿与找矿重点实验室, 西安 710054; |
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| 基金项目： | 国家科技重大专项（2016ZX05034001-006）、中国地质调查局能源矿产地质调查项目（DD20160174）、宁夏高层次科技创新领军人才培养项目和陕西省自然科学基金（2018JM4031）资助。 |
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| 摘 要： | 六盘山盆地具备一定的油气勘探条件。为了探索六盘山盆地页岩吸附气的赋存条件及其影响因素，通过建立吸附气模型等方法对盆地内GY1井白垩系马东山组泥页岩进行了研究。六盘山盆地白垩系泥页岩有机质含量偏低，最大甲烷吸附能力介于1.73~2.35 m3/t之间，均值为2.03 m3/t，具有较强的储气能力。泥页岩吸附能力随深度增加呈先增大后减小的趋势，存在一个深度拐点，在浅部压力起主要作用，而在深部温度起主要作用。泥页岩吸附气的赋存条件主要受6个方面的影响，其中有机质丰度、成熟度和湿度的影响并不显著，而矿物含量、微观物性和温度、压力是主要的影响因素。在外界地质条件适合的情况下，六盘山盆地页岩储层中的气体富集程度比较高，非常有利于页岩气的开发。
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| 关 键 词： | 赋存条件 吸附气 泥页岩 马东山组 白垩系 六盘山盆地 |
| 收稿时间： | 2018-09-20 |
Occurrence and controls of shale absorbed gas in Liupanshan Basin |
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| Affiliation: | 1. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits of MNR, Xi'an Center of Geological Survey, CGS, Xi'an, Shaanxi 710054, China;2. Ningxia Geological Survey, Yinchuan, Ningxia 750021, China |
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| Abstract: | The Liupanshan Basin has potentially favorable conditions for oil and gas exploration. An absorbed gas model and other methods were used to study the mud shale in the Cretaceous Madongshan Formation in the well GY 1 in the Liupanshan Basin in order to discuss the occurrence and controls of the shale absorbed gas. The Cretaceous shale in the basin has a relatively low content of organic matter, but the maximum methane adsorption capacity ranges from 1.73 to 2.35 m3/t with a mean value of 2.03 m3/t indicating a relatively high gas storage capacity. The adsorption capacity of the shale increases first and then decreases with increasing depth. There is a deep inflection point. Pressure plays a major role in shallow formations, while temperature plays a major role at depth. The occurrence conditions of shale absorbed gas were mainly affected by six factors, among which the influence of organic matter abundance, maturity and moisture content were not significant, while mineral content, microscopic properties, temperature and pressure were the main influencing factors. When the external geological conditions are suitable, the gas enrichment degree of the shale reservoir in the Liupanshan Basin could be relatively high and very favorable for exploration. |
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