煤矿水平孔复杂地质模型方位电磁波响应数值模拟

张意; 康正明; 冯宏; 韩雪; 陈刚

doi:10.12363/issn.1001-1986.21.12.0854

煤矿水平孔复杂地质模型方位电磁波响应数值模拟

doi: 10.12363/issn.1001-1986.21.12.0854

张意^{1, 2,},
康正明^3, ,,
冯宏²,
韩雪⁴,
陈刚²

基金项目: 陕西省自然科学基础研究计划项目(2021JQ-590)；陕西省教育厅专项科研计划项目(21JK0836)；国家自然科学基金青年科学基金项目(42102350)

详细信息

第一作者:
张意，1986年生，男，新疆伊宁人，博士研究生，工程师，研究方向为电磁波测井方法及仪器. E-mail：yizhang86@163.com

通信作者:
康正明，1989年生，男，陕西靖边人，博士，讲师，从事电法测井理论方法研究. E-mail：kzm991430414@sina.cn

中图分类号: TD17；P631
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-21
- 修回日期: 2022-03-16
- 发布日期: 2022-05-25
- 网络出版日期: 2022-04-29

Numerical simulation of azimuth electromagnetic wave response of complex geological model of horizontal hole in coal mines

ZHANG Yi^{1, 2
,},
KANG Zhengming^{3
, ,},
FENG Hong²,
HAN Xue⁴,
CHEN Gang²

摘要

摘要: 煤岩界面的预先、精准识别是实现煤矿巷道自动化掘进和煤矿智能化的关键技术之一，方位电磁波仪器探测距离较大，能够分辨岩性界面和界面方位，在油田测井中已取得成功应用，但在煤矿领域应用较少。为了研究方位电磁波测井在煤矿复杂三维(3D)模型中的探测性能，使用有限元数值模拟方法，考察了方位电磁波测井在煤矿测量环境中，不同发射频率和源距时受钻孔内流体的影响，以及采空区和起伏地层边界对方位电磁波测量的影响。结果表明：对于煤矿测井中的常见情况——孔中流体为空气时，方位电磁波响应受钻孔的影响较小；方位电磁波测量信号能够反映地层界面的起伏变化，其探测能力与发射频率、源距有关；方位电磁波响应对低阻采空区较敏感，但在高频发射时可以利用相位差信号实现对高阻采空区的探测。方位电磁波方法为煤矿井下水平孔煤岩界面和采空区测量提供了一种新技术手段，具有较大的应用潜力。
- 方位电磁波测量 /
- 煤岩界面 /
- 三维模型 /
- 水平孔 /
- 正演模拟
Abstract: The advance and accurate identification of the coal-rock interface is one of the key technologies to realize automatic tunneling and intellectualization of coal mines. Azimuth electromagnetic wave tool has a large detection range and can distinguish the lithologic interface and interface orientation. It has been successfully applied in oilfield logging, but there are few researches on the coal mine measurement environment. In order to study the detection performance of azimuth electromagnetic wave logging in the complex 3D model of coal mines, the finite element numerical simulation method is used to investigate the influence of the drilling fluid in the borehole on azimuth electromagnetic wave logging with different transmission frequency and spacing in the coal mine measuring environment, and the influence of the mined-out area and the stratigraphic boundary on the azimuth electromagnetic wave measurement. The results show that the azimuth electromagnetic wave response is less affected by the borehole when the fluid in the borehole is air. The azimuth electromagnetic wave measurement signal can reflect the fluctuation of the stratum interface, and its detection ability is related to the transmission frequency and spacing. The azimuth electromagnetic wave is sensitive to the low-resistance goaf, but a phase difference signal can be used to detect high-resistance goaf in high-frequency transmission. The azimuth electromagnetic wave method provides a new technical means for the measurement of the coal-rock interface and goaf in the horizontal hole of coal mines, which has great application potential.
- azimuth electromagnetic wave logging /
- coal-rock interface /
- 3D model /
- horizontal hole /
- forward modeling

HTML全文

图 1 PeriScope方位电磁波测井仪结构

T_i为发射线圈；R_i为接收线圈

Fig. 1 Structure of PeriScope azimuth electsromagnetic wave logging tool

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图 2 钻孔地质模型及钻孔横截面示意

Fig. 2 Borehole geological model and borehole cross section

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图 3 钻孔介质影响对比

Fig. 3 Comparison of the influence of media in drilling hole

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图 4 偏心距对方位电磁波测量信号的影响

Fig. 4 Influence of eccentricity on electromagnetic wave measurement signal

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图 5 仪器位于钻孔底部时钻孔半径的影响

Fig. 5 Influence of borehole radius when instrument is located at bottom of the well hole

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图 6 起伏地层模型

Fig. 6 Undulating formation model

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图 7 起伏地层幅度影响

Fig. 7 Influence of undulating formation amplitude

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图 8 仪器与地层界面距离的影响

Fig. 8 Influence of distance between instrument and formation interface

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图 9 仪器穿过起伏地层界面响应

Fig. 9 Instrument response through an undulating formation interface

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图 10 采空区地质模型

Fig. 10 Geological model of goaf

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图 11 频率0.1 MHz时仪器纵向移动采空区测量响应对比

Fig. 11 Comparison of measement response of instrument moving longitudinally in goaf at the frequency of 0.1 MHz

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图 12 频率0.4 MHz时仪器纵向移动采空区测量响应对比

Fig. 12 Comparison of measurement response of instrument moving longitudinally in goaf at the frequency of 0.4 MHz

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图 13 频率2.0 MHz时仪器纵向移动采空区测量响应对比

Fig. 13 Comparison of measement response of instrument moving longitudinally in goaf at the frequency of 2.0 MHz

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图 14 频率0.4 MHz时仪器横向移动采空区测量响应对比

Fig. 14 Comparison of measurement response of instrument moving laterally in goaf at the frequency of 0.4 MHz

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