石油学报 ›› 2022, Vol. 43 ›› Issue (7): 989-997.DOI: 10.7623/syxb202207009

• 油田开发 • 上一篇    下一篇

富有机质页岩中不同矿物的解吸规律

熊健1, 林海宇1, 李原杰2, 闫森1, 刘向君1, 何海铭1, 郑爽1, 胡谍1   

  1. 1. 西南石油大学油气藏地质及开发工程国家重点实验室 四川成都 610500;
    2. 中国石油塔里木油田公司 新疆库尔勒 841000
  • 收稿日期:2021-03-17 修回日期:2021-09-19 出版日期:2022-07-25 发布日期:2022-08-01
  • 通讯作者: 刘向君,女,1969年6月生,1995年获西南石油学院油气田开发工程专业博士学位,现为西南石油大学教授,主要从事岩石物理、工程测井等方面的教学与管理工作。Email:liuxiangjunswpi@163.com
  • 作者简介:熊健,男,1986年12月生,2015年获西南石油大学油气田开发工程专业博士学位,现为西南石油大学副研究员,主要从事非常规岩石物理等方面的研究。Email:361184163@qq.com
  • 基金资助:
    国家自然科学基金青年科学基金项目"页岩纳米级孔隙中甲烷解吸的微观机理研究"(No.41602155)、西南石油大学青年科技创新团队项目(2018CXTD13)和西南石油大学第二十期大学生开放性实验重点项目"页岩气层岩石中不同矿物的解吸规律研究"(2020KSZ02019)资助。

The desorption laws of different minerals in the organic-rich shale

Xiong Jian1, Lin Haiyu1, Li Yuanjie2, Yan Sen1, Liu Xiangjun1, He Haiming1, Zheng Shuang1, Hu Die1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
    2. PetroChina Tarim Oilfield Company, Xinjiang Korla 841000, China
  • Received:2021-03-17 Revised:2021-09-19 Online:2022-07-25 Published:2022-08-01

摘要: 四川盆地龙马溪组页岩气开发已由地质勘探转变为开发建产阶段,研究页岩中甲烷的解吸规律对于把握页岩气产出规律、正确评价页岩气可采储量有着重要意义。为了研究页岩中不同矿物的解吸特征及其对页岩气解吸的贡献,对龙马溪组页岩、蒙脱石、高岭石、伊利石、绿泥石、Ⅱ型干酪根及石英样品开展了60℃下高压甲烷等温吸附/解吸实验。在此基础上,定量分析了页岩、黏土矿物、石英及Ⅱ型干酪根的解吸迟滞现象,并计算了黏土矿物、Ⅱ型干酪根及石英中甲烷解吸效率曲线,研究了不同矿物之间解吸规律的差异性。研究结果表明,甲烷在干酪根、黏土矿物样品中的解吸过程表现出明显的解吸滞后现象,且不同黏土矿物样品的解吸滞后程度存在较明显的差异;干酪根的解吸迟滞系数最大,达到43.67%,不同类型黏土矿物的解吸迟滞系数不同,其大小顺序为蒙脱石>高岭石>绿泥石>伊利石;随着压力降低,页岩岩样、黏土矿物、干酪根和石英的解吸效率都呈增大的趋势,且干酪根、黏土矿物、页岩的甲烷解吸效率曲线都呈现出明显的阶段性。

关键词: 页岩气, 黏土矿物, 干酪根, 解吸迟滞, 解吸效率

Abstract: In China, the research stage of the Longmaxi Formation shale gas reservoirs has changed from geological exploration to development and production. These is a great significance to research the law of desorption of methane in shale for grasping the law of shale gas production and correctly evaluating the recoverable reserves of shale gas. In order to research the desorption characteristics of different minerals in shale and their contribution to shale gas desorption. High pressure methane isotherm adsorption/desorption experiments at 60℃ were carried out on samples of shale, montmorillonite, kaolinite, illite, chlorite, type Ⅱkerogen and quartz. On this basis, the desorption hysteresis of shale, clay minerals, quartz and type Ⅱ kerogen was quantitatively analyzed, and the methane desorption efficiency curve in clay minerals, type Ⅱ kerogen and quartz was calculated, and the difference in desorption law between different minerals was studied. The results show that the desorption process of methane in kerogen, shale and clay mineral samples shows obvious desorption hysteresis, and the degree of desorption hysteresis of different types of samples are different. Kerogen has the largest desorption hysteresis coefficient, reaching 43.67%. The desorption hysteresis coefficients of different types of clay minerals are different, and the order of magnitude is montmorillonite>kaolinite> chlorite>illite. As the pressure decreases, the desorption efficiency of shale rock samples, clay minerals, kerogen and quartz all show an increasing trend, and the methane desorption efficiency curves of kerogen, clay minerals, and shale all show obvious stage characteristics.

Key words: shale gas, clay mineral, kerogen, desorption hysteresis, desorption efficiency

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