利津地区沙四段上部低孔低渗储集层敏感性特征

济阳坳陷东营凹陷利津地区深层沙四段近岸水下扇低孔低渗岩性油气藏的非均质性强。在系统分析其储集层的矿物成分、物性、孔隙结构等岩矿特征的基础上，通过敏感性流动试验研究系统评价其潜在敏感性。研究结果，该地区低孔低渗储集层在钻探过程中水敏性和盐敏性突出，有针对性地提出的油层保护措施为：采用添加复合屏蔽暂堵剂的低密度钻井液，钻井液矿化度低于40g／L，进入储集层的速率低于2m／d；采用负压射孔；采用以浓磷酸为主的浓缩酸进行酸化解堵。这些措施在实际生产中取得了较好的效果。

Sensitivity of low porosity and permeability reservoir of upper Es4 Member in Lijin area, Dongying Sag, Jiyang Depression

The deep near shore submarine fan reservoirs of the 4 th member of Shahejie Fm. (Es 4 member) in Lijin area, located in Dongying Sag of Jiyang Depression, have low porosity, low permeability with strong heterogeneity. According to sensitivity flow tests, the potential sensitivity of these reservoirs was evaluated based on systematical rock mineral analysis of mineral components, physical properties, pore structures, etc. The studies showed that the water and salinity sensitivity obviously exist in these reservoirs. Following effective measures to protect reservoirs during drilling were recommended as follows: using low density drilling fluid with complex shield temporary blocking agent (whose salinity is lower than 40g/L) under low penetrating rate (<2m/d); negative pressure perforating; using high condensation acid (mostly concentrated phosphoric acid) to carry out acidization and block removing.