Borehole Locations and Altitudes for each of the Hydrogeologic Units of the Ozark Plateaus Aquifer System

A hydrogeologic framework of the Ozark Plateaus aquifer system was constructed as the base for a groundwater flow model developed as part of the U.S. Geological Survey Water Availability and Use Science Program to aid in the understanding of groundwater availability in select aquifer systems of the United States. The Ozark Plateaus aquifer system study area (hereinafter referred to as the “Ozark system”) is nearly 70,000 square miles and includes parts of Arkansas, Kansas, Missouri, and Oklahoma. A hydrogeologic framework was constructed to represent the altitudes and thicknesses of nine hydrogeologic units within the Ozark Plateaus aquifer system - . the Western Interior Plains confining system, Springfield Plateau aquifer, the Ozark confining unit, Ozark aquifer (divided into the upper, middle, and lower Ozark aquifers to better capture the spatial variation in the hydrologic properties), the St. Francois confining unit, the St. Francois aquifer, and the Basement confining unit. The formations that make up the hydrogeologic units of the Ozark system range from Pennsylvanian to Cambrian age. The scope of effort included the compilation and interpretation of hydrogeologic altitudes from geophysical, lithologic driller description, and well cutting logs. The final compiled dataset included more than 23,000 individual altitude points (excluding synthetic points) representing the nine hydrogeologic units. Shorthand names were used to identify points, extents, and raster surfaces corresponding to each hydrogeologic unit. WIPCS = Western Interior Plains confining system SPA = Springfield Plateau aquifer OCU = Ozark confining unit UOA = upper Ozark aquifer MOA = middle Ozark aquifer LOA = lower Ozark aquifer SFCU = St. Francois confining unit SFA = St. Francois aquifer BCU = basement confining unit

本研究构建了奥扎克高原含水层系统（Ozark Plateaus aquifer system）的水文地质框架，作为美国地质调查局（U.S. Geological Survey）水资源可用性与利用科学计划中开发的地下水流模型的基础，旨在助力理解美国部分选定含水层系统的地下水资源可利用性。本研究涉及的奥扎克高原含水层系统研究区（以下简称"奥扎克含水层系统"）总面积近70000平方英里，涵盖阿肯色州、堪萨斯州、密苏里州与俄克拉荷马州的部分区域。本次构建的水文地质框架旨在表征奥扎克高原含水层系统内9类水文地质单元的高程与厚度——分别为西部内陆平原隔水系统（Western Interior Plains confining system）、斯普林菲尔德高原含水层（Springfield Plateau aquifer）、奥扎克隔水层（Ozark confining unit）、奥扎克含水层（为更好刻画水文属性的空间变异，该含水层被划分为上奥扎克含水层、中奥扎克含水层与下奥扎克含水层）、圣弗朗索瓦隔水层（St. Francois confining unit）、圣弗朗索瓦含水层（St. Francois aquifer）以及基底隔水层（Basement confining unit）。构成奥扎克含水层系统水文地质单元的地层时代跨度从宾夕法尼亚纪至寒武纪。本研究工作涵盖了基于地球物理资料、岩性钻井描述以及钻井岩屑录井资料，对水文地质高程数据的整理与解译。最终整理完成的数据集包含超过23000个独立高程测点（不含合成测点），对应上述9类水文地质单元。研究采用简称标识对应各类水文地质单元的测点、研究范围与栅格表面，各简称对应关系如下：WIPCS = 西部内陆平原隔水系统（Western Interior Plains confining system）；SPA = 斯普林菲尔德高原含水层（Springfield Plateau aquifer）；OCU = 奥扎克隔水层（Ozark confining unit）；UOA = 上奥扎克含水层（upper Ozark aquifer）；MOA = 中奥扎克含水层（middle Ozark aquifer）；LOA = 下奥扎克含水层（lower Ozark aquifer）；SFCU = 圣弗朗索瓦隔水层（St. Francois confining unit）；SFA = 圣弗朗索瓦含水层（St. Francois aquifer）；BCU = 基底隔水层（basement confining unit）。