基于扇三角洲储层单砂体的剩余油定量描述
——以南堡凹陷柳赞油田北区Es33油藏为例

Quantitative description of remaining oil based on single sand body in fan delta reservoir bed: taking Es33 reservoir in northern region of Liuzan Oilfield in Nanpu Sag for example

 方度 贾倩 龚晶晶 高东华 袁立新 尹莉

 （中国石油冀东油田分公司勘探开发研究院，河北 唐山 063000）

 (Research Institute of Exploration and Development, Jidong Oilfield Company, PetroChina, Tangshan 063000, China)

 扇三角洲储层具有相变快、非均质性强、油水关系复杂等特点，以小层为单元的剩余油研究难以满足开发中后期调整需求，亟需开展单砂体剩余油定量描述。以南堡凹陷柳赞油田北区Es33油藏为例，在岩心描述、沉积构造分析、测井相识别的基础上，应用“垂向分期、侧向划界”方法，进行单砂体划分与边界识别；应用分级相控建模方法，建立单砂体三维非均质地质模型；开展单砂体油藏数值模拟，并应用剩余油饱和度、剩余油储量丰度与剩余油储量等3项指标对单砂体剩余油潜力进行了定量描述。钻探证实，预测结果真实可靠且具有较高精度，能有效指导研究区剩余油的精细挖潜。

 With distinguishing features of fast phase change, strong aeolotropy, complex hydrocarbon water contact in fan delta, study of remaining oil based on sublayer cannot meet the needs of adjustment during the middle-late development stages, and quantitative description of remaining oil for the single sand body in fan delta reservoir bed was launched. Taking Es33 reservoir in the northern region of Liuzan Oilfield in Nanpu Sag as an example, based on the core description, sedimentary structure analysis, electrofacies recognization, and the method of vertical substage and lateral delimitation, single sand bodies and sandstone boundary were identified. Using the method of fractional facies modeling, three-dimensional anisotropic geologic model for single sand bodies were built. The numerical reservoir simulation for single sand body and three indices including remaining oil saturation, remaining oil reserves abundance and remaining oil reserves are used to quantitatively describe residual oil potential of single sand body. Exploration drilling has confirmed that the forecasting results are helpful and accurate, which can effectively direct the fine tapping of the remaining oil.

10.6056/dkyqt201704021