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四川盆地侏罗系具致密油资源形成的条件,前人资源评价结果差别较大,需采用非常规的资源评价方法进一步认识其资源潜力。川中地区侏罗系致密储层石油生产井数据多,能使用EUR(Estimated Ultimate Recovery)分布类比法计算资源量。将EUR分布类比法分为6个基本步骤,在油气生产井多,生产时间长的地区能快速估算研究区的可采资源量。应用EUR分布类比法计算川中侏罗系致密储层石油的EUR分布,建立了EUR的地质评价标准,并估算了公山庙、桂花2个油区的可采资源量。结果表明:川中地区侏罗系3套主力产层中,50%概率下沙一段Ⅰ类区单井EUR值可达3×104t,凉上段Ⅰ类区的单井EUR值可达2.8×104t,大安寨段Ⅰ类区的单井EUR值为2.5×104t,有效烃源岩的厚度、裂缝发育程度、有效烃源岩厚度与储层厚度的比值对EUR值的影响最大;川中地区侏罗系致密油Ⅰ类区50%概率的生产井井控面积约为1.4km2,Ⅱ类区的井控面积主体在0.75~1km2之间,Ⅲ类区井控面积约为0.35~0.45km2;使用EUR分布类比法估算公山庙、桂花2个油区近2 000km2范围内3套主力产层的可采资源量分别为1 679.82×104t和781.53×104t,表明四川盆地侏罗系致密储层石油具有较大的勘探潜力。
The conditions for the formation of tight oil resources in the Jurassic in the Sichuan Basin differ greatly in the evaluation results of predecessors, and the resource potential needs to be further recognized by unconventional resource assessment methods. The Jurassic tight reservoirs in central Sichuan have more oil production wells and can calculate the amount of resources using the Estimated Ultimate Recovery (EUR) distribution analogy. Dividing the EUR distribution analogy into six basic steps allows for a quick estimation of the amount of recoverable resources in the study area in areas where production wells are long and oil and gas production wells are long. Using the EUR distribution analogy to calculate the EUR distribution of the oil in the Jurassic tight reservoirs in central Sichuan Basin, the EUR evaluation standard was established and the recoverable resources in two oil areas of Gongshan Temple and Osmanthus fragrans were estimated. The results show that in the three main Jurassic strata in the central part of Sichuan Province, the EUR value of single well of type Ⅰ Ⅰ in Shashi I Section is up to 3 × 104t with a 50% probability. The EUR value of single well in type Ⅰ of Liangzhao Section can reach 2.8 × 104t. The EUR value of single well in the Zhazai Class I area is 2.5 × 104t, and the ratio of the effective source rock thickness, the degree of fracture development, the effective source rock thickness and the reservoir thickness has the greatest impact on the EUR value. In the Central Sichuan Basin, the Jurassic tightness The well control area with 50% probability in Class I area is about 1.4km2, the well control area in Class Ⅱ area is between 0.75km and 1km2, and the well control area in Class Ⅲ area is about 0.35 ~ 0.45km2. Using the EUR distribution analogy The estimated recoverable resources of the three main formations in Gongsanmiao and Osmanthus fragrans in the vicinity of 2 000km2 are respectively 1 679.82 × 104t and 781.53 × 104t, indicating that the Jurassic tight reservoirs in the Sichuan Basin have a large amount of oil Exploration potential.