| 张成丽,李永,熊英举,孙旭,王天才,陈开银,钱伦.基准电阻率优化下ERT与HPTEM联合探测松桃宝塔组地层浅层岩溶[J].贵州地质,2026,43(1):90-98 |
| 基准电阻率优化下ERT与HPTEM联合探测松桃宝塔组地层浅层岩溶 |
| Joint Detection of Shallow Karst in the O3b Formation of Songtao County by ERT and HPTEM Based on Baseline Resistivity Optimization |
| 投稿时间：2025-12-09 |
| DOI： |
| 中文关键词: 基准电阻率 高密度电法 等值反磁通瞬变电磁 宝塔组地层 浅层岩溶 |
| 英文关键词:Baseline resistivity ERT HPTEM O3b Formation Shallow karst |
| 基金项目:贵州省地质矿产勘查开发局地质科研项目(黔地矿科合〔2024〕2)资助 |
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| 中文摘要: |
| 针对贵州松桃县花垣断层片区宝塔组(O3b)地层中浅层岩溶发育隐蔽、探测精度低的问题，研究旨在提出一种基于基准电阻率优化的高密度电法(ERT)与等值反磁通瞬变电磁法(HPTEM)联合探测方案。首先通过ERT正演模拟，对比不同基准电阻率的应用效果，确定最优值，该参数下的正演结果与预设模型匹配度最高。随后实施现场探测:先以ERT初步圈定岩溶异常区域，再采用HPTEM小点距精细探测，并测试不同基准电阻率的反演差异。最终钻孔验证表明，将ERT正演所得最优基准电阻率作为HPTEM反演参数，其结果与实际揭露的岩溶情况高度吻合，证实了该技术组合的有效性。该研究提出的技术组合和参数优化方法能够有效克服高电阻率背景下隐蔽浅层岩溶的探测难题。未来，在类似碳酸盐岩地区的勘探中，可根据该方案为同类型地层的岩溶勘察提供可靠的技术支持。 |
| 英文摘要: |
| To address the challenges of concealed development and low detection accuracy of shallow karst in the Baota Formation (O3b) stratum in the Huayuan Fault Zone of Songtao County，Guizhou Province，this study proposes a combined detection scheme of ERT and HPTEM based on baseline resistivity optimizationThrough ERT forward modeling，the application effects of different reference resistivities were compared to determine the optimal value，and the forward modeling results under this parameter showed the highest matching degree with the preset modelSubsequently，field detection was carried out:ERT was first used to preliminarily delineate karst anomaly areas，followed by HPTEM fine detection with small point spacing，and the inversion differences of different reference resistivities were testedUltimately，borehole verification showed that when the optimal Baseline resistivity obtained from ERT forward modeling was used as the HPTEM inversion parameter，the results were highly consistent with the actually exposed karst conditions，which verified the effectiveness of this technical combinationThe technical combination and parameter optimization method proposed in this study can effectively overcome the challenges of detecting concealed shallow karst under high resistivity backgroundsIn the future，this approach can provide reliable technical support for karst exploration in similar carbonate rock regions |
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