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天然气地球科学 ›› 2020, Vol. 31 ›› Issue (8): 1178–1184.doi: 10.11764/j.issn.1672-1926.2020.03.009

• 天然气勘探 • 上一篇    下一篇

页岩油储层D—T2核磁共振解释方法

王志战1,2()   

  1. 1.页岩油气富集机理与有效开发国家重点实验室，北京 100101
    2.中国石化石油工程技术研究院测录井研究所，北京 100101
  • 收稿日期:2019-12-10 修回日期:2020-03-13 出版日期:2020-08-10 发布日期:2020-07-29
  • 作者简介:王志战（1969-），男，山东栖霞人，教授级高级工程师，博士，主要从事录井技术研究. E-mail: Wangzz.sripe@Sinopec.com.
  • 基金资助:
    页岩油气富集机理与有效开发国家重点实验室开放基金(P17014-9);国家自然科学基金(21427812);中国石化科技部项目(P14095);中国石化油田勘探开发事业部项目(YTXD-PT1203D);中国石化石油工程技术服务有限公司项目(SG16-46X)

Discuss on D-T2 NMR interpretation of oil shale

Zhi-zhan WANG1,2()   

  1. 1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China
    2.Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China
  • Received:2019-12-10 Revised:2020-03-13 Online:2020-08-10 Published:2020-07-29
  • Supported by:
    The China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms Effective Development(P17014-9);The National Natural Science Foundation of China(21427812);The Sinopec Research Project of Science and Technology Ministry(P14095);The Sinopec Research Project of Oilfield Exploration and Development Ministry(YTXD-PT1203D);The Sinopec Research Project of Petroleum Engineering Technology Service Co., Ltd(SG16-46X)

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摘要：

D—T2二维核磁共振能够快速、直观地区分不同性质、不同赋存状态的孔隙流体，已成为储层评价的热门技术，但对于页岩油储层，常规储层的D—T2孔隙流体解释图版并不适用，考虑受限扩散、内部梯度等影响因素的修正图版也难以满足页岩油储层油、水识别的要求。为此，采用理论分析与实验分析相结合的方法，对D—T2孔喉尺度分辨率、流体含量分辨率、孔隙流体解释图版3个关键要素进行了深入研究。结果表明，D—T2孔喉尺度分辨率、流体含量分辨率均低于T2一维核磁共振，难以检测到T2短于2 ms、含量低于0.2%的流体信号；D—T2信号位置与流体含量有关，且随着流体含量的递增，具有随机游走特性。2口页岩油井的应用表明，基于流体含量信号响应轨迹的D—T2流体解释图版能够实现页岩油储层的准确解释。

关键词: D—T2核磁共振, 页岩油储层, 油水识别, 分辨率, 解释图版

Abstract:

D-T2 two-dimensional nuclear magnetic resonance (NMR) could quickly and visually distinguish different type, different occurrence state of pore fluid, and become the hot technology for reservoir evaluation, but for oil shale, D-T2 pore fluid interpretation chart of conventional reservoir is not suitable. The correction chart, considering restricted diffusion, internal gradient, etc., is also difficult to meet the requirements of oil and water recognition in oil shale. Therefore, three key scientific problems of D-T2 pore throat scale resolution, fluid content resolution and pore fluid interpretation chart are studied by combining theoretical analysis and experimental analysis. The results show that the pore throat scale resolution and fluid content resolution of D-T2 NMR was lower than that of T2 NMR, and it was difficult to detect the fluid signal with T2 shorter than 0.2ms and content less than 0.2%.The location of D-T2 signal is related to fluid content and has a random walk property as fluid content increases. The applications of two shale oil wells show that the D-T2 fluid interpretation chart based on the signal response trajectory can achieve accurate interpretation of oil shale.

Key words: D-T2 NMR, Oil shale, Oil and water identification, Resolution, Interpretation chart

中图分类号: 

  • TE132.1+4

图1

非受限扩散与受限扩散的D—T2解释图版（据文献[16-17]修改）"

图2

不同信号完整度的页岩D—T2二维谱"

图3

D—T2信号随流体质量增加的变化白油质量：(a) 0.002 6 g; (b) 0.020 7 g; (c) 0.038 5 g; (d) 0.060 3 g"

图4

D—T2信号面积、质心与流体质量之间的关系"

图5

Ya井核磁共振解释成果"

图6

Yb井核磁共振解释成果"

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