应用层次分析法研究透镜状砂体成藏主控因素

AHP applied in the research of main controlling factors for studying formation of sand lens reservoir

透镜状砂体油气成藏的主控因素具有典型的层次特征 ,层次分析法是定量分析透镜状油气藏非常有效的方法。对济阳坳陷古近系透镜状油气藏的成藏要素进行统计分析 ,建立了层次分析结构模型和两两对比判别矩阵 ,应用层次分析计算方法 ,找出了成藏的主控因素。分析研究认为 ,砂体的沉积微相、储集层物性、烃源岩和储集层的埋深及演化程度、有机质丰度及生烃潜力、排烃效率等因素是透镜状砂体圈闭成藏的主控因素 ,前 5项因素对该类油气藏的成藏贡献超过75 %。在建立成藏要素自身评价标准的基础上 ,给出各成藏要素自身评价分值与该要素成藏贡献大小权值 ,建立了透镜状油气藏的加权综合评价模型。用该模型对济阳坳陷几个典型透镜状油气藏进行定量评价 ,评价结果与实际统计结果一致性很好。图 4表 3参

The main controlling factors on the formation of sand lens reservoir are of typical arrangement characteristics. AHP is a particularly effective method for quantitatively analyzing non quantitative matter in the research of sand lens reservoirs. In the analysis process of main controlling factors of formation of the Paleogene petroliferous sand lens in the Jiyang Depression, arrangement structure model and contrast judging matrix were constructed, and AHP calculation method was applied to find out main controlling factors. The research shows that many factors, such as sedimentary microfacies of sandbody, physical property of reservoir, depth and diagenesis extent of source rock and reservoir, organic matter abundance and hydrocarbon generation potential of source rock and efficiency of hydrocarbon expulsion, are the main controlling factors of sand lens reservoirs, and the former five factors make up more than 75 per cent contributions to the formation of this kind of reservoir. On the basis of constructing the evaluation standard of every factor, the synthetical evaluation model of lens reservoir is constructed . By applying AHP to quantitatively evaluate some typical lens reservoirs in the Jiyang Depression, the quantitative results have good coherence to those of the practical statistics.