我国东部断陷盆地石油排聚系数统计模型的建立

Establishment of Statistical Model for Oil Migration and Accumulation Coefficients of Rift Basins in East China

根据我国东部断陷盆地15个标准区的石油排聚系数及其相关地质参数的统计数据,通过对排聚系数诸地质因素的相关性分析,确定其主控地质因素。研究认为石油排聚系数与评价单元烃源岩的生烃强度、储集层的孔隙度、渗透率、圈闭面积系数及生储盖组合数目5大地质因素关系密切。采用多元回归法建立了我国东部断陷盆地石油排聚系数与其主控地质因素之间的统计模型,建立了预测排聚系数的数学模型,使石油排聚系数取值更合理、客观,从而提高了油气资源评价成果的可信度和可比性。

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.