Abstract Dike swarms are mega-structures observed in different geological contexts which may affect groundwater flow systems. These structures are well recognizable from airborne magnetic, however it is difficult to obtain quantitative information about distribution and mean properties of dikes that generate the observed magnetic anomalies. This work presents a procedure to perform magnetic data inversion along profiles transecting the Ponta Grossa Dike Swarm (PGDS) and determine its mean properties with application of cluster analysis to obtained solutions. Next, the mean model solutions are correlated with a regional database of borehole productivity suggesting that more productive wells are found close to a group of shallow dikes of the PDGS in Southeastern Brazil. For the area mainly composed by sedimentary rocks, the wells situated over shallow dikes show higher values of specific capacity by a factor of 14.5 than those not close to a dike in the same domain. For the area mainly composed by granitic rocks, the productivity of wells over dikes is still higher, a factor of 4.3 higher than those with no dikes. A conceptual model is presented to explain the higher productivity of wells close to the dikes, as resulting from fracturing on host rock caused by dikes emplacement. Only a group of shallow dikes seems to be associated with more productive wells.

中文翻译：

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巴西 Ponta Grossa Dike Swarm 的井产能：结合磁数据反演和模型解聚类分析的综合研究

摘要 堤防群是在不同地质环境中观察到的巨型结构，可能会影响地下水流系统。这些结构可以从空中磁场中很好地识别出来，但是很难获得关于产生观测到的磁异常的堤防的分布和平均特性的定量信息。这项工作提出了沿横切 Ponta Grossa Dike Swarm (PGDS) 的剖面执行磁数据反演的程序，并通过将聚类分析应用于获得的解决方案来确定其平均特性。接下来，平均模型解与钻孔生产力的区域数据库相关联，表明在巴西东南部的一组 PDGS 浅堤附近发现了更多的生产井。对于以沉积岩为主的地区，位于浅堤坝上的井的比容量值比不靠近同一区域堤坝的井高 14.5 倍。对于以花岗质岩为主的地区，围堤井产能仍较高，比无围堰高4.3倍。提出了一个概念模型来解释靠近堤坝的井的更高生产力，这是由堤坝就位引起的围岩破裂造成的。只有一组浅堤似乎与更高产的井有关。提出了一个概念模型来解释靠近堤坝的井的更高生产力，这是由堤坝就位引起的围岩破裂造成的。只有一组浅堤似乎与更高产的井有关。提出了一个概念模型来解释靠近堤坝的井的更高生产力，这是由堤坝就位引起的围岩破裂造成的。只有一组浅堤似乎与更高产的井有关。