鄂尔多斯盆地麻地沟地区长6储层敏感性分析

鄂尔多斯盆地麻地沟地区长6储层属于低孔、特低渗储层,储层渗流条件较差。为厘清储层敏感性对渗流条件的影响以及储层的损害机理,通过X衍射、全岩定量分析、薄片鉴定、室内岩芯流动实验等,对研究区长6储层进行了敏感性评价。结果表明,麻地沟地区长6储层具有弱水敏、弱酸敏、弱碱敏、中等偏弱盐敏以及弱速敏等特征。针对储层敏感性问题,可采用注入与储层内流体水质相同或相近的水、压裂和酸化等措施改造、控制入井流体的p H值、调节注入储层流体的矿化度、控制注水速度等措施使其增产。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。

Analysis on sensitivity of Chang 6 reservoir in Madigou area,Ordos Basin

Chang 6 reservoir in Madigou area belongs to low porosity and ultra-low permeability reservoir, and its seepage condition is poor. In order to understand the influence of reservoir sensitivity on seepage conditions and the mechanism of reservoir damage, the sensitivity evaluation of Chang 6 reservoir in the study area was carried out by X-ray diffraction, quantitative analysis of whole rocks, thin section identification, and indoor core flow experiments.The results show that Chang 6 reservoir in Madigou area has characteristics of weak water sensitivity, weak acid sensitivity, weak alkali sensitivity, moderately weak salt sensitivity, and weak velocity sensitivity. In view of the reservoir sensitivity, measures such as injection of water with the same or similar water quality as that in the reservoir, fracturing and acidizing, etc., control of the pH value of the fluid entering the well, adjust the salinity of the injected reservoir fluid, and control the injection rate can be taken to increase the production.The experimental results can provide theoretical basis for the sustainable development and protection of Chang 6 low permeability reservoir.