特低渗透储层中高含水期水淹程度识别方法探讨——以五里湾A油藏为例

A low permeable reservoir watered-out degree at the high water-cut stage identification method is discussed in this paper——To Wuliwan A reservoir as an example

注水开发油藏,随着注入水的长期冲刷和采出程度增加,储层特征与原始储层特征存在较大差异,尤其受储层非均质性影响,储层不同层段的水淹程度不同,如何用测井特征去识别水淹程度及有效指导开发调整是特低渗油藏进一步提高采收率面临的难题。本文以检查井为例,根据检查井现场岩心观察实验结合常规测井及核磁测井响应特征和试油试采验证,初步形成了特低渗储层不同水淹级别的识别方法和标准。为特低渗透储层后期剩余油的挖潜方式、射孔层段的优化及储层改造工艺的优选,具有较强的借鉴指导意义。

Waterflooding reservoir, with the long-term washout and recovery degree increase of injected water,and there is large difference between the original reservoir characteristics the reservoir characteristics, especially affected by the heterogeneity of the reservoir, reservoir watered-out degree of different layer.How to use the logging characteristics to identify watered-out extent and effective guiding development adjustment is to further improve oil recovery of low permeability reservoirs are faced with the problem. In inspection wells, for example, this paper according to inspect the site of the well core observation experiment combined with conventional logging and nuclear magnetic logging response characteristics and testing, test validation, preliminarily formed the special low permeability reservoir water levels of the different recognition methods and standards. For extra-low permeability reservoir residual oil potential in way, perforation interval optimization and optimization of reservoir reconstruction process, has strong reference significance.