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中原马寨油田卫９５块从１９９５年７月底起开始注弱碱水。弱碱水是主要用Ｃａ（ＯＨ）２处理油田采出水而得到的ｐＨ在８—９的水，Ｃａ２＋、ＯＨ－含量升高而Ｆｅ３＋、Ｃｌ－、Ｓ２－含量降低。室内测定结果表明，此种弱碱性水无生成ＣａＣＯ３沉析的倾向，对储层岩芯的渗透率和粘土矿物无伤害，与地层水完全配伍。与注弱碱水前相比，注弱碱水２０个月期间注水井吸水剖面改善，区块储量动用程度提高，储层能量稳定，采出水ｐＨ值不变，矿化度和主要离子含量变化不大。
Zhongyuan Mazhai Oilfield Wei 95 from the end of July 1995 began to note weak alkaline water. Weak alkalinity is the water with the pH value of 8-9, which is mainly produced by treating the oilfield with Ca (OH) 2. The contents of Ca2 + and OH- increase while the content of Fe3 +, Cl- and S2- decrease. The results of indoor tests show that this weak alkaline water has no propensity to form CaCO3 precipitate, has no harm to permeability and clay minerals of reservoir core, and is completely compatible with formation water. Compared with the pre-weak alkali injection, the water injection profile of injection wells improved, the utilization of block reserves improved, the reservoir energy was stable, the pH value of produced water was unchanged, the salinity and main ion content changed Not big.