沧东凹陷孔二段页岩油资源评价方法与应用

摘要

沧东凹陷孔二段湖盆中心发育一套页岩油藏,分布面积达260 km2.基于该区地质条件和勘探实际,分别采用成因法、EUR类比法及小面元容积法进行资源潜力预测,并对3种方法进行了对比分析.结果认为:成因法预测的核心是建立生排烃模型,其计算结果往往偏大,可作为页岩油资源量的上限值;EUR类比法是依据油气田生产递减规律建立模型并进行油气资源量预测,鉴于研究区长期连续生产井数量少,其预测结果可作为参考;小面元容积法是基于储层评价的一种资源预测方法,预测结果相对更为客观.该研究可有效地指导沧东凹陷孔二段页岩油的勘探部署.%There is a set of shale oil reservoir with an area of 260 km2 within the center of lake-basin in the Kong2 member of Cangdong Sag.Base on the regional geology and exploration practice,the genetic method,EUR analogy and small-bin volumetric method are used and compared to evaluate resource respectively.Research demonstrates that the core of genetic method is to establish hydrocarbon generation-expulsion model,which usually results in resource overestimation and can be used as the upper limit of shale oil resource.EUR analogy is to estimate hydrocarbon resource by establishing production decline models.Due to the small number of production wells with continuous production history,the resource estimation by EUR analogy can only be considered as a reference.The smallbin volumetric method based on reservoir evaluation could lead a more objective resource estimation.This research could provide a significant guidance for the shale oil exploration and deployment in Kong2 Member of Cangdong Sag.