Genetic Analysis of Chang 2 Low Resistivity Reservoir in Jiyuan Area of Ordos Basin

The resistivity of low resistance oil layers is similar to that of water layers, which poses difficulties for oil and gas development. This study mainly analyzes the genesis of the Chang2 low resistance oil reservoir in Wangpanshan District of Jiyuan Oilfield from factors such as formation water salinity, physical properties, pore structure, clay minerals, debris particles, and structure. It was found that the mineralization degree of water in the Chang2 formation in the Wangpanshan area is 79.04 g/L on average, and the water type is mainly CaCl2; Debris particles, clay minerals, pore types, and capillary forces affect the bound water saturation, resulting in low oil saturation in long reservoirs. The intrusion of freshwater mud causes a significant increase in water layer resistance. This study analyzes the genesis of the Chang2 low resistance oil reservoir and has certain guiding significance for oil production.