Hawaii Play Fairway Analysis: Lanai Resistivity and Density 3D Inversion Models

To prepare for its third phase, the Hawaii Play Fairway project conducted groundwater sampling and analyses in ten locations in the Hawaiian islands, magnetotelluric (MT) and gravity surveys, as well as calculations of 3D subsurface stress due to the weight of the rock underlying the topography of the volcano. The subsurface stresses were used to evaluate the potential for fracture-induced permeability. Inversions of the MT and gravity data produce 3D models of resistivity and density, respectively, on Lanai, across Haleakala's SW rift (Maui), and surrounding Mauna Kea (Hawaii Island). The project developed and applied a new method for incorporating depth information about resistivity, density, and potential for fracture-induced permeability into the statistical method for computing resource probability in these three focus areas. The project then incorporated the new groundwater results with the new geophysical results and the calculations of potential for fracture-induced permeability to produce updated maps of resource probability and confidence. These results were used to identify target sites for exploratory drilling.

Spreadsheet information: Each sheet contains data for a particular depth in kilometers. Positive depths are above sea level, and negative below.

For more information, go to the Hawaii Groundwater and Geothermal Resources Center website linked in the resources.

为准备其第三阶段工作，夏威夷航道规划项目在夏威夷群岛的十个地点进行了地下水采样与分析，执行了磁大地测量（MT）和重力调查，并计算了由火山顶部下方岩石重量引起的三维地下应力。地下应力被用于评估由裂缝诱导的渗透性潜力。对MT和重力数据的反演分别生成了拉奈岛、马祖岛的哈莱卡拉西南断层（玛伊）以及莫纳凯亚山（夏威夷岛）周围的电阻率和密度三维模型。该项目研发并应用了一种新的方法，将关于电阻率、密度以及裂缝诱导渗透性潜力的深度信息纳入统计方法，以计算这三个重点区域的资源概率。随后，项目将新的地下水结果与新的地球物理结果以及裂缝诱导渗透性潜力的计算相结合，产生了资源概率和置信度更新的地图。这些结果被用于确定勘探钻探的目标地点。

电子表格信息：每个工作表包含特定深度（千米）的数据。正值表示海拔以上，负值表示海拔以下。

如需更多信息，请访问资源中链接的夏威夷地下水与地热资源中心网站。