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从含油气系统理论出发，将圈闭成藏的地质条件分为５个单项地质条件及１８个子项因素，并以子项因素建立圈闭基础数据库；然后，确定各子项因素的评价标准，从而实现其评价的定量化；由专家打分定量给出已钻探圈闭的各单项地质条件的评价，由此回归出评价曲线，得到未钻探圈闭的定量评价；最后，利用己钻探圈闭的含油气情况，通过一种最优化方法，对未钻探圈闭的含油气情况作出定量的评价。用大庆长垣南地区的实际资料验证表明，本方法简单、实用、准确。
Based on the petroleum system theory, the geological conditions of trap accumulation are divided into five single geological conditions and 18 sub-factors, and the trapping basic database is established based on the sub-factors. Then, the evaluation criteria of each sub-factor are determined, So as to realize the quantification of the evaluation. The expert scoring quantitatively gives the evaluation of the individual geological conditions of the drilled traps, and then returns the evaluation curve to obtain the quantitative evaluation of the un-drilled traps. Finally, Including oil and gas conditions, a quantitative evaluation of the unconsolidated trapped oil and gas by an optimization method. The actual data of Daqing Changyuan area shows that this method is simple, practical and accurate.