Abstract: According to the statistical data of oil migration and accumulation coefficients and related geological parameters in fifteen standard areas of rift basins in East China, the correlation analysis of various geological factors which affect oil migration and accumulation coefficients are conducted to determine their main controlling factors. The study shows that oil migration and accumulation coefficients are closely related with five kinds of geologic factors such as source rock generation hydrocarbon intensity, reservoir porosity, reservoir permeability, trap area coefficient and source rock-reservoir-cap rock assemblage number. The multi-element regression approach is used to establish the statistical model between oil migration and accumulation coefficients and main controlling geological factors of rift basins in East China and the mathematic model for forecast of the oil migration and accumulation coefficients, so as to make it more reasonable and more objective for determination of oil migration and accumulation coefficients, thus enhancing the reliability and comparability of hydrocarbon resources appraisal results.

Key words: rift basin, oil-gas resources, oil migration coefficient, oil accumulation coefficient, statistical model