基于动静结合的缝洞型油藏建模数模一体化及应用:以塔河油田T436单元为例

Integration and Application of Geological Modeling and Numerical Simulation Based on Combining Geological and Dynamic Modification for Fractured-vuggy Reservoirs:Taking the T436 Unit of the Tahe Oilfield as an Example

缝洞型油藏储集体离散不规则分布,具有极强的非均质性,油水分布关系复杂,导致缝洞型碳酸盐岩储层建模的不确定性大,静态雕刻的地质模型与实际情况存在一定误差。因此,提出了一种通过静态建模与动态历史数据相结合,基于储量标定和连通性约束下的建模数模新方法。基于缝洞单元的动态连通性建立模型,依靠历史生产动态开展储量修正、连通性修正和见水特征修正模型,并通过塔河油田2区奥陶系风化壳剥蚀区T436单元对该方法进行了验证。在经过上述动态修正之后,得出更加准确的油藏模拟模型。结果表明:基于此提出的针对性建议及措施显著改善了T436单元的开发效果,证实了基于动静结合的建模数模一体化技术的可行性与实际应用价值,对未来缝洞型油藏的开发具有重要的参考借鉴意义。

The distribution of reservoirs in fractured-vuggy reservoirs is discrete and irregular,resulting in strong heterogeneity and a complex oil-water distribution relationship.This leads to large uncertainty when modelling fractured-vuggy carbonate reservoirs,and there may be errors between the static characterization of the geological model and the actual situation.Therefore,a new approach was proposed to numerical modelling by combining static modelling with dynamic historical data,based on reserve and connectivity constraints.The model was established based on the dynamic connectivity of the fracture-vug unit.It relies on historical production to carry out reserve modification,connectivity modification,and water breakthrough characteristics modification.The method was verified by the T436 unit of the Ordovician weathered crust stripping zone of the Tahe oilfield area 2.After the dynamic corrections,a more accurate reservoir simulation model was derived.The results show that the proposed suggestions and measures have significantly improved the development effect of Unit T436.This confirms the feasibility and practical application integrating of geological modelling and numerical simulation based on combining geological and dynamic modification.It is of great significance for the future development of fractured-vuggy reservoirs.