288断块砾岩油藏注水过程中储层损害机理研究

288断块油藏为低孔低渗油藏，储层物性差，注水开发过程中出现注水压力升高快、吸水量下降的现象。综合利用储层岩矿分析、岩石物性测定、敏感性实验评价方法，分析了288断块吸水层储层损害机理。研究表明，288断块油藏储层的水敏性、速敏性和低渗透性是储层受损的内在因素，回注污水中硫酸还原茵严重超标、回注污水矿化度太低以及工作制度不合理是外在因素。针对性提出了预防注水井储层损害的措施和手段，提高注水井的吸水能力，保证油田正常注水。

Study on Formation Damage Mechanism of Fault Block 288 of Conglomerate Reservoir in Waterflooding

The fault block 288 belongs to the reservoir with low porosity,low permeability and poor physical property.Some wells had the phenomenon that much water was injected and more difficulties were found in the process of waterflooding With the use of many mature techniquse such as reservoir rock analyses,physical property detection and sensibility experimental evaluation,the main reservoir damage factors of fault block 288 were studied.The results show that water sesitivity,velocity sensitivity and low permeability of the formation in fault block 288 are the internal factors damaging formation.The serious superscale bacterium in injection well,low salinity in injected water and unreasonable salinity are the exterior factors.For the purpose of solving the problem,prevention measures techniques are developed for improving the water absorbing ability in heavy water sensitivity reservoirs,the absorption ability to the injectors can be raised for ensuring the stable water injection in the oilfield.