Abstract: The conglomerate reservoir in Xiagou formation of Lower Cretaceous (K_1g) in Qingxi oilfield is a kind of deep fratural-porous reservoir. Oil pool is usually buried in 4 200~4 600 m in depth. The matrix porosity is less than 8%, the matrix permeability is less than 1×10^-3μm². Because high-angle fractures are well developed in the reservoir, flowing performance of it is improved. By using some techniques of rock composition, pore type and assemblage, pore structure, NMR, well log and test integrated with the results from fractural planar prediction, we make a research in reservoir prediction and get good effects.

Key words: Jiuquan basin, Qingxi oilfield, Lower Cretaceous, conglomerate reservoir, fracture