非均质复杂断块油藏渗流规律与挖潜研究

Reservoir Seepage Law and the Potential Research of Heterogeneous Complicated Fault Block

砂岩油藏高含水期提高采收率问题具有普遍意义。茨601区块目标油藏储层具有中孔、中高渗物性,但18年开发的采收率仅为8.5%,明显低于一般类似油藏。在精细地质研究和油藏工程分析的基础上,建立了三维地质模型和油藏数值模拟模型,借助历史拟合和典型井网单元模拟,研究分析了油藏内渗流规律和开发特征,搞清了非均质复杂断块油藏砂体分布不连续,井间连通性差是油藏采出程度低的主要原因。基于以上认识并结合剩余油分布研究结果,提出了合理的开发调整建议,对于高含水期砂岩油藏开发具有代表性。

Enhancing oil recovery with high water cut stage of sandstone reservoirs has general significance. Reservoir layer in Ci 601 block has properties of middle porosity and middle or high permeability,but the developed recovery rate was only to 8. 5% after 18 years,to be significantly lower than general similar reservoirs. Based on fine geological research and reservoir engineering analysis,3D geologic model and reservoir numerical simulation model are established,and by history matching and typical well pattern unit simulation,he reservoir seepage law and development characteristics have been researched and analyzed,to clarify that the main reason of low oil recovery degree is discontinuous distribution of the heterogeneous complicated fault block reservoir sand body,and poor connectivity inter well. Based on the above understanding and combining with the research results of remaining oil distribution,the reasonable development and adjustment suggestions are put forward for the development of sandstone reservoirs in high water cut stage.