Figure F5. Comparison of the Hostile Environment Gamma Ray Sonde (HNGS), Multisensor Spectral Gamma Ray Tool (MGT), and Scintillation Gamma Ray Tool (SGT) data from the base of the black shale interval at Site 1260. Both the MGT and SGT provide data of comparable resolution, and higher than that acquired with the HNGS. However, the SGT provides data that extends deeper into the borehole, capturing (at Site 1260) the base of the black shale deposits at 486.5 equivalent logging depth (eld) below the base of the black shale interval. gAPI = American Petroleum Institute gamma ray units.

Figure F5. Comparison of the Hostile Environment Gamma Ray Sonde (HNGS), Multisensor Spectral Gamma Ray Tool (MGT), and Scintillation Gamma Ray Tool (SGT) data from the base of the black shale interval at Site 1260. Both the MGT and SGT provide data of comparable resolution, and higher than that acquired with the HNGS. However, the SGT provides data that extends deeper into the borehole, capturing (at Site 1260) the base of the black shale deposits at 486.5 equivalent logging depth (eld) below the base of the black shale interval. gAPI = American Petroleum Institute gamma ray units.