石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (6): 1389-1400.doi: 10.11743/ogg20210613

• 油气地质 • 上一篇    下一篇

二维核磁共振技术表征页岩所含流体特征的应用——以松辽盆地青山口组富有机质页岩为例

白龙辉1(), 柳波1,*(), 迟亚奥1, 李士超2, 闻迅1   

  1. 1. 东北石油大学 陆相页岩油气成藏及高效开发教育部重点实验室, 黑龙江 大庆 163318
    2. 中国地质调查局 沈阳地质调查中心, 辽宁 沈阳 110000
  • 收稿日期:2021-07-30 出版日期:2021-12-28 发布日期:2021-12-16
  • 通讯作者: 柳波 E-mail:bailonghui0302@163.com;liubo@nepu.edu.cn
  • 作者简介:白龙辉(1994-), 男, 博士研究生, 非常规油气地质。E-mail: bailonghui0302@163.com
  • 基金资助:
    国家自然科学基金面上项目(41972156);中国石油科技创新基金项目(2020D-5007-0106)

2D NMR studies of fluids in organic-rich shale from the Qingshankou Formation, Songliao Basin

Longhui Bai1(), Bo Liu1,*(), Yaao Chi1, Shichao Li2, Xun Wen1   

  1. 1. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Northeast Petroleum University, Ministry of Education, Daqing, Helongjiang 163318, China
    2. Shenyang Geological Survey Center, China Geological Survey, Shenyang, Liaoning 110000, China
  • Received:2021-07-30 Online:2021-12-28 Published:2021-12-16
  • Contact: Bo Liu E-mail:bailonghui0302@163.com;liubo@nepu.edu.cn

摘要:

页岩中已被证明含有大量可供开采的油气资源,厘清页岩中异相流体含量及赋存态对页岩油的开发至关重要。二维核磁共振技术能够对页岩中含氕(1H)化合物进行无损、快速、定量检测。对松辽盆地青山口组一段页岩样品进行抽提前后、自发渗吸以及加热过程中的核磁共振检测,定量评价青一段页岩异相流体含量、赋存状态以及页岩放置时的流体散失。结果表明,在核磁二维谱图上,类固体有机质和轻质烃类主要分布于T1大于10 ms的上方区域,两者间基本以T2=0.1 ms为界,分别与有机碳含量TOCS1(游离烃)具有良好的线性关系。松辽盆地南部青一段页岩油主要以游离及吸附态赋存,页岩粘土含量越高,吸附态页岩油含量越高,游离态越少。页岩自发渗吸过程中的核磁共振检测结果表明了粘土矿物吸水膨胀作用。在页岩抽真空加热过程中,轻质烃挥发损失的同时水也大量地损失。利用密闭取心样品,结合二维核磁共振技术,可恢复其原始含油饱和度和含水饱和度。

关键词: 二维核磁共振, 有机质丰度, 页岩, 青山口组, 松辽盆地

Abstract:

Shale may contain a large amount of oil and gas that can be commericially exploited. Clarifying the content and occurrence of different fluids in shale is crucial to the development of shale oil. High frequency (23 MHz) two-dimensional (2D) NMR technology that can be used to quickly, nondestructively and quantitatively measure protium-containing (1H) fluids in shale is employed to test shale samples (from the Qingshankou Formation in Songliao Basin) before and after extraction as well as during spontaneous imbibition and constant temperature rising experiments. The content and occurrence of different fluids in the samples as well as the loss of fluid from the samples after a period of static settlement are quantified and analyzed. The results show that on the 2D NMR maps, the signals of analogous solid organic matter and movable hydrocarbons, roughly separated by T2=0.1ms, are mostly distributed in the region above T1>10 ms. Good linear correlations can be observed between the signals and TOCs or S1. Oil is either free or absorbed in shale samples from the Qingshankou Formation. Higher clay content means more absorbed oil and less free oil in shale. The 2D NMR spectrum obtained during spontaneous imbibition experiment indicates water swelling of clay minerals. The vacuum heating process of the samples shows both volatilization of light hydrocarbons and significant loss of water. Samples from sealing core drilling combined with 2D NMR can be used effectively in the restoration of the original oil saturation and water saturation.

Key words: two-dimensional NMR, abundance of organic matter, shale, Qingshankou Formation, Songliao Basin

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