摘要：
Reservoir physical properties change with the changes of various conditions,and then the relative parameters will change,which is called sensitivity phenomena and will impact oil and gas production.Conventional evaluation methods and criteria are not in good accordance with production practice,which needs to be further discussed and improved.The study results of this paper shows that the level of reservoir sensitivity can be expressed by the loss ratio of rock permeability and the evaluation standards can be changed from 0.3 and 0.7 to 0.1 and 0.3,respectively.Water sensitivity is the extreme situation of salt sensitivity,so salt sensitivity evaluation includes water sensitivity evaluation.Stress sensitivity of tight reservoirs is quite weak,which causes negligible influences on production.Stress sensitivity of unconsolidated reservoirs is in favor of oil displacement,but its laboratory evaluation is very difficult.Velocity sensitivity is a false concept and belongs to experimental artifacts,which can not reveal the real sensitivity of reservoir rocks and may misguide the production practice.Permeability of rocks is very sensitive to the grain size of solid particles carried within the injected water,which must be evaluated properly.The conventional 5-item sensitivity evaluations can be changed to the 4-item sensitivity evaluations,namely sensitivities to salt,acid,alkali and grain size.%储集层物性随条件变化,有关参数也发生变化,即出现所谓的敏感现象,并影响油气生产,需要认真评价.现有的评价方法和评价标准都存在一些问题,客观性不足.根据研究,储集层敏感程度可以用渗透率损失率来表示,评价标准可以由0.3和0.7改为0.1和0.3.水敏属于盐敏的极端情况,盐敏评价包括了水敏评价;致密储集层的应力敏感性极弱,对生产影响极小;疏松储集层的应力敏感有利于驱油,实验室很难评价;速敏是一个伪概念,属于实验假象,不仅不能反映储集层敏感的本质,还可能误导生产实践;储集层渗透率对注入水中的固相颗粒大小非常敏感,需要认真评价.因此,储集层的常规五敏评价可以改为四敏评价,即盐敏、酸敏、碱敏和粒度敏评价.
