冷湖地区新生界致密砂岩储层敏感性研究

为了提高产能,减少柴达木盆地北缘冷湖地区油气开采过程中对砂岩储层造成的伤害,采用岩心流动实验,对该区致密储层的敏感性特征进行了研究,定量评价了储层敏感程度。实验结果表明:受岩石组成、黏土矿物、孔隙结构、成岩作用等因素影响,该区储层整体表现为较强的速敏性、水敏性和盐敏性,碱敏损害变化大,从无碱敏到强碱敏,弱酸敏性。此研究对该区的油气藏开发及油层保护具有一定的指导作用。

Reservoir sensitivity of Cenozoic tight sandstone reservoir in Lenghu area,northern margin of Qaidam Basin

To improve production capacity and reduce sandstone reservoir damage in the process of oil and gas exploration in Lenghu area,northern margin of Qaidam Basin,through core flow experiment,the sensitivity characteristics of tight reservoir was studied,and the quantitative evaluation of the reservoir sensitivity was made.The experimental results show the reservoir had strong velocity sensitivity,strong water sensitivity and strong salt sensitivity,while the alkali sensitivity damage changed greatly,from non-alkali sensitive to strong alkali sensitivity and weak acid sensitivity.The sensitivity study provided a good guiding significance for oil and gas exploration and reservoir protection in this area.