Abstract: Based on fluid flowing through porous media mechanisms and the geologic characteristic of exploitation, 102 geologic models were established in low permeability reservoir of Changqing oil field in this paper. Using numerical simulation,102 schemes were designed and calculated in rhomboidal and
rectangular well patterns. A theoretical plate of reasonable ratio of space between wells and rows in different well patterns were studied, and different anisotropy degree formations of low per-meability reservoirs were determined. Through the theoretical plate, the reasonable ratio of space between wells and rows was easily acquired. All these things will provide theoretical supports
for designing the exploitation schemes.

Key words: low permeability reservoir, anisotropy, reason-able ratio of space between wells and rows, numerical simula-tion, theoretical plate