Discussion of Precision Evaluation Issues in Ground High Precision Magnetic Exploration
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摘要:
地矿行业现行的《地面高精度磁测技术规程》(DZ/T 0071-93)是一部很好的技术规程,为中国高精度磁测的大规模应用打下了良好的基础。然而这毕竟是在30年前的技术条件下制定的技术规程,存在历史的局限性,其中有许多方面已不能适应当今的需求。本研究是笔者在实际工作中,对《地面高精度磁测技术规程》(DZ/T 0071-93)在应用时常出现的问题及现阶段看来存在的局限性进行一些总结和思考,讨论了地面高精度磁测野外工作质量评价过程中和在进行精度统计时极其常见的一些错误,在此基础上进一步分析了该规程中有关精度评价部分本身存在的一些问题和不足,并提出了相应的改进建议。这些建议可能并不是最佳方案,希望与从事高精度磁测工作的地球物理工作者共同探讨。
Abstract:The technical specification for ground high precision magnetic survey (DZ/T 0071-93) currently implemented by the geological and mining industry is a good technical regulation, which has laid a good foundation for the large-scale application of high precision magnetic exploration in China.However due to the technical specification made thirty years ago, there are some historical limitations, and many aspects of it are no longer suitable for today's needs. This paper is the author's summary and reflection on the problems that often occur in the application of the technical specification for ground high precision magnetic survey (DZ/T 0071-93) and the shortcomings that seem to exist at this stage, firstly discussing an extremely common error of precision statisticsin the process of the quality evaluation of ground high-precision magnetic exploration, secondly further discussions on some problems and shortcomings of the precision evaluation related to the specification are made, andput forward corresponding suggestions for improvement.These suggestions may not be the best solutions, but it is hoped that the discussion of geophysicists engaged in high-precision magnetic surveycan arouse, and be helpful to the revision of new ground highprecision magnetic survey specification.
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Key words:
- ground high-precision magnetic survey /
- precision /
- error /
- evaluation method /
- problem
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表 1 《地面高精度磁测技术规程》(DZ/T 0071-93)中的磁测误差分配表
Table 1. Error allocation table for magnetic measurement in technical specification for ground high-precision magnetic survey (DZ/T 0071-93)
磁测
总误差(nT)野外观测均方误差(nT) 基点、高程及正常场改正误差(nT) 总计 操作及
点位误差仪器一致性
误差仪器噪声
误差日变改正
误差总计 正常场改正
误差高程改正
误差总基点改正
误差5 4.36 2.65 2.0 2.0 2.0 2.45 1.0 1.0 2.0 2 1.56 1. 1 0.7 0.5 0.7 1.212 0.7 0. 7 0.7 1 0.87 0.7 0.3 0.3 0.3 0.497 0.28 0.28 0.3 注:操作及点位误差中,含点位不重合、探头高度不准、探杆倾斜等误差。引自《地面高精度磁测技术规程》(DZ/T 0071-93)第5.2.4条。 表 2 《地面高精度磁测技术规定》(DZ 56-87)中的磁测误差分配表
Table 2. Error allocation table for magnetic measurement in technical regulation for ground high-precision magnetic survey (DZ 56-87)
磁测总
误差(nT)仪器噪声均
方误差(nT)仪器一致性
误差(nT)测点观测均
方误差(nT)基点联测均
方误差(nT)各项改正误差(nT) 总计 日变改正 正常场
改正高度改正 ±5 ±1.2 ±1.5 ±3.8 ±1.5 ±2.1 ±1.5 ±1.0 ±1.0 ±2 ±0.5 ±0.7 ±1.1 ±0.7 ±1.21 ±0.7 ±0.7 ±0.7 ±1 ±0.3 ±0.3 ±0.7 ±0.3 ±0.52 ±0.3 ±0.3 ±0.3 注:引自《地面高精度磁测技术规定》(DZ 56-87)第2.2.5条。 表 3 《地面磁法勘探技术规程》(SY/T 5771-1995)中的磁测均方根误差分配表
Table 3. Root mean square (RMS) error allocation table for magnetic measurement in technical specification for ground magnetic exploration (SY/T 5771-1995)
磁测总均方
根误差(nT)野外观测均方根误差(nT) 正常场
改正(nT)高程改正
(nT)基点联测
(nT)总计 操作及点位 仪器一致性 仪器噪声 日变改正 7 5.8 3.8 2.4 2.4 2.8 2.5 2.5 1.5 5 4.2 2.6 2 1.8 2 1.5 1.8 1 2 1.6 1. 1 0.7 0.5 0.7 0.7 0. 7 0.6 1 0.9 0.7 0.3 0.3 0.3 0.3 0.3 0.3 注:详见《地面磁法勘探技术规程》(SY/T 5771-1995)第4.4.2.4条。 表 4 《地面磁法勘探技术规程》(SY/T 5771-2004)磁测均方根误差限差表
Table 4. RMS error limits table for magnetic measurement in technical specification for ground magnetic exploration (SY/T 5771-2004)
比例尺 异常总均
方根误差(nT)分项均方根误差(nT) 仪器性能指标(nT) 日变改正
精度(nT)检查
观测正常场
改正高度
改正日变站
联测一致性 噪声
水平观测
精度系统
误差1∶200 000 7 6.0 1.0 1.0 2.5 2.4 2.4 2.8 2.4 2.4 1∶100 000 5 4.0 1.0 1.0 1.8 2.0 1.8 2.2 2.0 1.8 1∶50 000 3 2.0 1.0 1.0 1.5 1.2 1.0 1.3 1.2 1.0 1∶25 000 2 1.5 0.5 0.5 0.5 0.9 0.5 1.0 0.9 0.5 1∶10 000 1 0.9 0.1 0.1 0.1 0.5 0.3 0.6 0.5 0.3 注:详见《地面磁法勘探技术规程》(SY/T 5771-2004)第4.4.2条。 表 5 《地面磁法勘探技术规程》(SY/T 5771-2011)中的异常总精度及分项精度分配表
Table 5. Total anomaly accuracy and subitem accuracy allocation table in technical specification for ground magnetic exploration (SY/T 5771-2011)
比例尺 异常总精度(nT) 分项精度(nT) 检查观测 日变站联测 正常场平面改正 高度改正 1∶200 000 7.0 6.0 2.5 1.0 1.0 1∶100 000 5.0 4.0 1.8 1.0 1.0 1∶50 000 3.0 2.0 1.5 0.7 0.7 1∶25 000 2.0 1.5 0.5 0.4 0.4 1∶10 000 1.0 0.9 0.3 0.2 0.2 注:详见《地面磁法勘探技术规程》(SY/T 5771-2011)第4.5条。 表 6 调整后的高精度磁测误差统计表
Table 6. Revised error statistics table for high-precision magnetic measurement
磁测总误差nT 野外观测均方误差(nT) 改正误差(nT) 日变站联测误差 日变改正误差 正常场改正误差 高程改正误差 …… …… …… …… …… …… -
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