轮南石炭系储层特征及敏感性

轮南石炭系是塔里木油田的主要油气生产层之一，由于该储层复杂的地质特征和较强的敏感性，在勘探开发过程中往往对储层造成一定程度的伤害，影响了油气生产高产稳产。为此，应用薄片鉴定、X射线衍射、扫描电镜等岩心分析技术，根据现场岩心研究了储层岩石的岩性、矿物成分、孔隙结构等储层特征。并通过全套岩心敏感性流动实验，评价了该储层的敏感性特征。研究结果表明，轮南石炭系储层以细粒石英砂岩为主，填隙物以方解石为主，粘土矿物以伊利石为主，储层属低孔特低孔、低渗特低渗储层；同时具有强水锁，强油速敏，中强水敏和盐敏，中强碱敏，在低压下就有压敏性，无酸敏性。其保护储层的关键技术措施是：入井流体矿化度不应低于100000mg／L，pH值不应高于9，合适的酸化作业可以较大幅度地改善储层的渗透性。

Reservoir Characteristic and Sensitivity of Lunnan Carboniferous

Lunnan Carboniferous is the main productive layer in Talimu oilfield. Due to the geologic complexity and stronger sensitivity of this layer, reservoir damage often occur during exploration and development, and effect then will be occurred to high and stable production. With the application of core analysis techniques, such as thin section identification, x ray diffraction and SEM, reservoir characteristics, such as lithology, mineral components and pore structure, are studied. The sensitivity features of the reservoir are evaluated based on core sensitivity flow experiment. The research results suggest: in Lunnan Carboniferous fine grain quartz sandstone is the major, the main matrix is calcite, illite is the main clay mineral, and the reservoir belongs to low to especially low porosity and low to especially low permeability reservoir; The reservoir is also featured by strong oil velocity sensitivity, medium strong water sensitivity and salt sensitivity, medium strong alkaline sensitivity and pressure sensitivity under low pressure without acid sensitivity. In order to protect the reservoir, the injected fluid salinity should not less than 100000mg/L and pH value ought to be less than 9. Certain acidizing can improve the permeability greatly.