Surficial Gamma Ray Logs

GAMMA_RAY_LOGS_IGS_IN.shp shows the locations of the Indiana Geological Survey's natural gamma-ray logs that were collected from 1978 to 2012. It was updated by Indiana Geological Survey (IGS) personnel on May 9, 2012 to add new data and to include existing locations of wells with "sample only" designations (rotary cuttings or cores) that were formerly excluded. Additionally, the dataset now contains an attribute field named "SAMPLE_ID" for referencing physical samples in the IGS Archives. Data were updated in the attribute field named "Type" to differentiate between wells which have only gamma-ray logs (value of "GL"), wells with gamma-ray logs and physical samples (value of "LS"), or wells where only samples (value of "SO") were collected. This shapefile also includes information concerning coordinate locations, surface elevation, and vertical depths of gamma-logs.GAMMA_RAY_LOGS_IGS_IN.shp 展示了1978年至2012年间采集的印第安纳地质调查局（Indiana Geological Survey，IGS）自然伽马测井点位分布。该数据集于2012年5月9日由IGS工作人员完成更新，新增了部分测井数据，并纳入了此前未被收录的带有“仅采样”标识（即回转岩屑或岩心）的钻井点位信息。此外，本次更新后的数据集中新增了名为"SAMPLE_ID"的属性字段，用于关联IGS档案库中的实体样品。同时，名为"Type"的属性字段也完成了数据更新，用于区分三类钻井：仅开展伽马测井的钻井（字段值为"GL"）、同时开展伽马测井与实体样品采集的钻井（字段值为"LS"），以及仅完成样品采集的钻井（字段值为"SO"）。该形状文件（shapefile）还包含伽马测井的坐标位置、地表高程以及垂向深度等相关信息。