地球物理学进展 ›› 2018, Vol. 33 ›› Issue (4): 1480-1485.doi: 10.6038/pg2018BB0222

• 应用地球物理学Ⅰ(油气及金属矿产地球物理勘探) • 上一篇    下一篇

井中瞬变电磁旁测范围初探

段书新,汪硕,乔宝强,张志勇   

  1. 核工业北京地质研究院,中核集团铀资源勘查与评价技术重点实验室,北京 100029
  • 收稿日期:2017-09-28 修回日期:2018-07-19 出版日期:2018-08-20 发布日期:2018-09-13
  • 作者简介:段书新,男,1987年生,湖北随州人,硕士,工程师,主要从事地球物理勘探研究.(E-mail: cugbdantou@163.com)
  • 基金资助:
    中核集团“龙灿”示范工程《二连铀矿基地勘查采冶技术研究与示范项目》和中国核工业地质局《井中瞬变电磁精细数据处理与解释技术研究》(项目编码:201728-5)联合资助.

Side measurement range of bore hole transient electromagnetic method

DUAN Shu-xin,WANG Shuo,QIAO Bao-qiang,ZHANG Zhi-yong   

  1. Beijing Research Institute of Uranium Geology, CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing 100029, China
  • Received:2017-09-28 Revised:2018-07-19 Online:2018-08-20 Published:2018-09-13

摘要:

为查明井中瞬变电磁旁测能力,从室内数值模拟和野外勘查实例两个角度开展了井中瞬变电磁旁测范围研究.在室内,以单边长度100 m、厚度10 m、电导率为100 S/m的水平板体为研究对象,通过建立相同工作参数、不同空间位置的地电模型,分析其理论响应认为:当目标体埋深小于1500 m时,其与钻孔距离在200 m以内时能够被井中瞬变电磁所识别;且随着深度变浅,井中瞬变电磁旁测范围扩大.在野外,利用大官厂地区的井中瞬变电磁实测,准确识别钻孔南西方位约71 m、埋深约652 m的隐伏火山口一处.室内数值模拟及野外现场实测表明,井中瞬变电磁具备在深部发现井旁低阻地质异常体的能力,其旁测范围甚至可达井旁200 m,可推广应用于我国的深部找矿工程.

关键词: 井中瞬变电磁, 旁测范围, 200 m

Abstract:

In order to ascertain the side measurement ability of Bore Hole Transient Electromagnetic Method (BHTEM), indoor numerical simulation and field investigation are carried out to research the BHTEM side measurement range. Aimed at a specific horizontal target plate with 100 m length of side, 10 m thickness and 100 S/m conductivity, we build 12 geo-electric models with different depth and distance. With same work parameters, we get BHTEM soundings of every model. After analyzing the curve, it is considered that BHTEM can detect low-resistance anomaly in the range of 200 meters around the hole when the target depth is less than 1500 meters. And also, compared with different sounding curves of every model, we find that BHTEM side measurement range is increased with depth’s decrease. In the field, with BHTEM survey in Daguanchang work area, we accurately identify a concealed crater at a depth of 652 meter, southwest of the hole with 71 m distance. Both indoor numerical simulation and field investigation indicate that BHTEM has a good ability to detect low-resistance anomaly near the hole in the deep. The side measure range can reach even 200 m, which would be very useful for deep ore prospecting.

Key words: BHTEM, side measurement range, 200 m

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