Abstract: Oil-pool of Yanchang form ation Chang^-6 is the typical lithologic oil-pool, it mainly is controlled delta sedimentary system of continental facies. Reservoir physical property is bad, and the output is low, and natural energy is deficient, now, sciencerea sonable water injection is essential action of Yanchang oil-field continue development, if the whole oil reservoir set generally develop, the producing degree and the economic benefit is poor, because the anisotropism of reservoir is high. The author synthesis the basic geologic data on core, well-logging, experiment and geologic borehole log and so on, and union region geologic characteristic, study on sedimentary microfacies of subzone, accurate stratum contrast, and the distribution rule of the sand stone, by accurate division development reservoir groups, which provides geologic basis better than general in jection-production technology to optimize the injection-production development scheme and select advanced matching technology.