地面核磁共振技术在推求潜水含水层厚度及导水系数中的应用

Application of Surface Nuclear Magnetic Resonance Technology in Deriving Unconfined Aquifer Thickness and Transmissibility Coefficient

根据21眼地质勘探孔、水文地质勘探孔及28个地面核磁共振(SNMR)勘探点资料,对比分析了钻孔揭露的含水层厚度与SNMR解译的含水层厚度、钻孔抽水试验所得含水层导水系数与SNMR解译的导水系数的差异,据此绘制出西辽河冲淤积平原潜水含水层厚度与导水系数分布图。结果表明,在SNMR试验噪音较小时SNMR解译的含水层厚度、导水系数与钻孔揭露的含水层厚度及水文地质试验结果吻合较好。利用SNMR技术解译含水层厚度、导水系数并通过少量钻孔及抽水试验予以校正,不仅可以节省大量勘探工作量,而且精度及可行度也较高。

According to the data of 21 geological exploration holes, hydrogeologie exploration holes and 28 nuclear magnetic resonance exploration sites, the differences of aquifer thickness obtained by boring and SNMR technique are comparative analysis. And then, the differences of transmissibility coefficient calculated by boring pumping test and SNMR technique are compared and analyzed. Finally, the aquifer thickness and transmissibility coefficient distribution map of the unconfined aquifer in West Liaohe River alluvial--plain are plotted. The results show that when the noise is lower in nuclear magnetic resonance test, aquifer thickness and transmissibility coefficient inversed by SNMR technique are similar to the results of aquifer thickness obtained by boring and hydrogeologic test. Using SNMR technique to infer aquifer thickness and transmissibility coefficient and correcting by combination of fewer boring and pumping test can reduce the workload of exploration and improve the precision and reliability.