陆相多层砂岩油藏渗透率表征与定向井初期产能预测——以蓬莱19-3油田为例

Permeability characterization and directional wells initial productivity prediction in the continental multilayer sandstone reservoirs: A case from Penglai 19-3 oil field,Bohai Bay Basin

基于对蓬莱19-3油田多层砂岩油藏定向井初期产能主要影响因素的研究,提出基于岩相约束的渗透率解释模型,建立了适用于海上多层砂岩油藏的定向井初期产能预测公式。蓬莱19-3油田定向井初期产能主要影响因素为渗透率和含油饱和度。利用蓬莱19-3油田岩心、扫描电镜、铸体薄片、测井和生产动态等资料,综合考虑储集层宏观沉积特征和微观孔隙结构对渗透率的影响,建立了基于岩相约束的多层砂岩油藏渗透率解释新模型。在渗透率校正的基础上,引入电阻增大率表征含油饱和度的影响,修正Vandervlis的定向井产能公式,得到适用于陆相多层砂岩油藏定向合采井初期产能的计算公式。研究结果表明,考虑岩相约束后的渗透率并引入电阻增大率后的产能预测公式计算精度高。

Based on study on the main factors affecting the initial productivity of directional wells in multilayer sandstone reservoirs of Penglai 19-3 oil field, a permeability interpretation model based on lithofacies constraint was established, and an initial productivity prediction formula for directional wells in offshore multilayer sandstone reservoirs was derived. Permeability and oil saturation are the main factors affecting initial productivity of directional wells in Penglai 19-3 oil field. Using core, scanning electron microscope, casting thin section, logging and production data, and a new permeability interpretation model considering the influence of macro sedimentary characteristics and microscopic pore structure was built. On the basis of permeability correction, resistivity increase ratio is introduced to characterize the effect of oil saturation, to modify the Vandervlis productivity formula of directional wells to get an initial productivity prediction equation suitable for continental multilayer sandstone reservoirs. The study results show that the permeability considering petrographic constraints and the production forecasting formula including resistivity increase ratio are more accurate.