Formation of hoodoo-upland on Ordovician karst slope and its significance in petroleum geology in Tahe area, Tarim Basin, NW China

ZHANG San,JIN Qiang,SUN Jianfang,WEI Hehua,CHENG Fuqi,ZHANG Xudong

Fig. 7. Electrical characteristics of small and medium size fracture-cave groups in the hoodoo-upland on the karst slope. GR—Natural gamma ray; GRk—Uranium-free gamma ray; ρ—Density; ?CNL—Compensated neutron porosity; Δt—Acoustic time; RLLD—Deep lateral resistivity; RLLS—Shallow lateral resistivity.