The North Huazhou area in Weihe Basin, a transition zone between the Ordos Block and Qinling Orogenic Belt, hosts multiple Cenozoic reservoirs critical for helium, geothermal, and tight oil/gas exploration. Based on Well H1 core, logging, and laboratory data, multi-scale analyses of the Sanmen, Zhangjiapo, Lantian-Bahe Formations, and Gaoling Group reveal significant lithological differentiations: the Zhangjiapo Formation is a medium-porosity, medium-permeability reservoir, whereas the Lantian-Bahe Formation exhibits low porosity and permeability. X-ray diffraction confirms dominant siliceous minerals with clay fluctuations reflecting strong hydrodynamic environments. Moderately strong veloc... More >