Abstract: Based on the data of core and testing oil, we analyze the causes of low-permeability sandstone reservoir with full consideration to the impact of the grain size, sorting, pore-throat radius, complex pore structure, content of debris and hydrophilic of rock on productivity. The simple sand-shale reservoir model has been subdivided into the silt-sand, fine-sand, sand-medium, sand-shale model. The concept of oil production probability is proposed on the basis of the elaborate reservoir interpretation. The oil-water two-phase fluids rate forecast model, interpretation template and criterion are eventually established according to calculating oil and water production on single well by using the corresponding software which is programmed on superposition method. Correct evaluation on reservoir capacity can help to scientifically guide the exploration and development of oil field. So the logging technology becomes the eye of the geologists and reservoir engineers.

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