准噶尔盆地玛湖凹陷北斜坡玛131井区块三叠系百口泉组储层敏感性评价

Reservoir Sensitivity Evaluation of the Triassic Baikouquan Formation in Ma131 Block of Mabei Slope in Mahu Depression,Junggar Basin

玛湖凹陷斜坡区三叠系百口泉组为低孔低渗砂砾岩储层,储层敏感性对储集性能影响较大,因此进行储层敏感性研究对于防止储层损害和制定合理的开发方案具有重要意义。在分析研究区百口泉组砂砾岩储层基本特征基础上,参照碎屑岩储层评价标准,采用敏感性流动实验对百口泉组扇三角洲砂砾岩储层敏感性进行了研究。结果表明:研究区百口泉组黏土矿物类型以伊/蒙混层为主(占38.74%),其次为绿泥石(占29.46%)、高岭石(占21.96%)和伊利石(占9.83%);敏感性流动实验表明百口泉组储层具有中等偏强盐敏、中等偏弱水敏、弱速敏、弱碱敏的特征;影响储层敏感性的主要原因是储层中黏土矿物类型以及储层孔喉结构。通过研究结果建议油气勘探开发施工过程中应重点防止盐敏、水敏,有针对性地采取措施保护储层。

Reservoir of Baikouquan Formation in Mahu Depression is characterized by low porosity and permeability.Because of the great reservoir sensitivity influence on its physical property,it is very important to study the reservoir sensitivity of Baikouquan Formation,which can help protecting reservoir and making reasonable development plan.By analysing the basic characteristics of the reservoir with reference to the standards of clastic reservoir evaluation,this paper studies the sensitivity of sandy conglomerate reservoirs within the fan delta of Baikouquan Formation based on core flow test data.The result shows that this reservoir is characterized by middle to strong salt sensitivity,middle to weak water sensitivity,week velocity sensitivity and week to middle aid sensitivity and alkali sensitivity.The study indicates that the different types of clay mineral and pore throat structure are the main cause for the resevior sensitivity.These results suggest that salt sensitivity and water sensitivity should be first prevented in the process of oil and gas production,and corresponding measures should be taken to protect the reservoir.