石南J_2t_2低渗透砂岩油藏含水变化特征及水淹模式分析

ANALYSIS ON WATER RATIO VARIATION AND WATER FLOODING PATTERN OF LOW-PERMEABILITY SANDSTONE RESERVOIRS IN SHINAN J2t2

非均质注水开发砂岩油藏的见水方向，是油藏开发过程中需要不断深入研究的重要内容之一。见水方向的准确判断是确定剩余油分布和制定油藏中～后期注采结构调整方案的重要依据，会影响注水开发效果。这里针对石南J2t5油藏开发初期出现的部份井含水上升快，见水方向复杂的问题，综合研究了储层物性非均质特点，储层改造，裂缝产状和生产动态资料，总结出二种基本水淹模式。油藏水淹受多种因素影响，在分析过程中应综合各种资料进行分析。目前预测的见水方向与油藏实际生产情况吻合，对油藏后期调整具有较好的实际指导意义。

The breakthrough direction of heterogeneous water flooding sandstone reservoir is one of the essential content during the exploitation process.It's an important foundation to confirm remaining oil distribution and adjust the exploitation plan,so it would affect the water-flooding efficiency.Dealing with some problems such as fast water ratio rise,complex breakthrough direction in early development of Shinan J2t2,we made comprehensive research by combining the heterogeneous of reservoir properties,reservoir transformation,fracture occurrence and dynamic data etc,and concluded two basic flooding patterns in this paper.Reservoir flooding is under the influence of many elements and should be analyzed with various data.The predicted breakthrough direction by us coincides with the actual situation,which is useful to later reservoir regulation.