鄂尔多斯盆地中东部老草湾地区储层敏感性评价

Reservoir Sensitivity Evaluation in Laocaowan Area in the Middle East of Ordos Basin

鄂尔多斯盆地中东部老草湾地区长6储层属于低孔、特低渗储层,储层渗流条件较差。储层敏感性研究是实现储层保护,减小储层伤害的必要手段。论文在研究储层岩石学特征、孔隙结构特征及敏感性矿物特征的基础上,对研究区长6储层进行了敏感性评价。结果表明,鄂尔多斯盆地中东部老草湾地区长6储层具有等偏弱速敏、强水敏、中等偏强水敏、中等偏弱水敏、弱盐敏、中等偏强酸敏、中等偏弱碱敏等特征。储层的敏感性特征受黏土矿物成分、岩石矿物学特征、孔隙结构和物性影响,其中黏土矿物的含量和组成是主要影响因素,实际开发过程中应予以高度重视。实验结果可为研究区长6低渗透油藏的可持续开发和保护提供理论依据。

The Chang 6 reservoir in the Laocaowan area in the central-eastern part of the Ordos Basin is a low-porosity and ultralow permeability reservoir with poor seepage conditions.Reservoir sensitivity research is a necessary means to realize reservoir protection and reduce reservoir damage.Based on the study of reservoir petrological characteristics,pore structure characteristics and sensitive mineral characteristics,the sensitivity evaluation of Chang 6 reservoir in the study area is carried out.The results show that the Chang 6 reservoir in the Laocaowan area of the central-eastern Ordos Basin has equal to weak velocity sensitivity,strong water sensitivity,medium strong water sensitivity,medium weak water sensitivity,weak salt sensitivity,medium strong acid sensitivity,and medium weak Alkaline sensitivity and other characteristics.The sensitivity characteristics of the reservoir are affected by the composition of clay minerals,rock mineralogy,pore structure and physical properties.The content and composition of clay minerals are the main influencing factors,which should be paid attention to in the actual development process.The experimental results can provide a theoretical basis for the sustainable development and protection of the Chang 6 low permeability reservoir in the study area.