辽东湾凹陷石油运聚成藏过程中运载层残留油量计算关键参数的求取

Method for obtaining key parameters for calculating residual oil amount in carrier beds after oil migration and accumulation in the Liaodong Bay Depression

以辽东湾凹陷为例,针对古近系沙河街组一、二段储层,通过地质统计方法及储层残留烃量与储层物性等数据的地质分析,根据油气在烃源灶内和灶外的残留特征,结合运载层油柱浮力与孔隙毛管压力的关系,确定残留油柱高度,并对运载层残留油量进行了计算。结果表明,辽东湾凹陷沙河街组一、二段运载层残留油量在1.84×108～2.59×108t,约占排烃量的7.4%～10.4%。储层滞留烃是油气二次运移过程中的主要损耗方式,残留油量计算模型关键参数的获得对于预测结果的准确性具有重要的影响。

The 1^st and 2^sd member of the Paleogene Shahejie Formation （E3sl and E3s2） in the Liaodong Bay depression were taken as examples. We performed geologic and statistical analyses on the residual hydrocarbons and physical properties of the reservoirs. Based on the characteristics of residual hydrocarbons inside and outside the hydrocarbon kitchen and in combination with the relationship between buoyanee of oil column in carrier beds and capillary pressure of pores,we determined the height of residual oil column and calculated the amount of residual oil in calxier beds. The results show that the amount of residual oil range from 184 to 259 million tons in the carrier beds of E3sl and E3s2 in the Liaodong Bay depression,amounting to 7.4%- 10.4% of the total hy-drocarbon expulsion. Residual hydrocarbon in reservoirs is the main loss of hydrocarbon in the process of secondary migration. The key parameters for calculating residual oil have great impact on the accuracy of prediction.