胜坨油田三角洲储层岩石物理特征

注水开发油田三角洲储层剩余油分布复杂 ,其主要原因是储层间不同微相及不同部位的岩石物理特征有明显差异。对胜坨油田二区沙河街组二段 7、8砂层组岩心及测井分析资料进行了研究 ,结果表明 ,随注水开发程度的提高 ,三角洲储层表现为强亲水性 ;不同微相及不同部位砂体的毛管压力差异明显 ,这种差异也是造成剩余油分布复杂的重要原因。储层的相对渗透率曲线交点平均值较大 ,形态不对称 ,油水两相共渗区跨度较小 ,这进一步印证了储层的强亲水润湿性。该研究结果对研究区剩余油的挖潜具有重要的指导意义

Petrophysical characteristics of rock in delta reservoir of Shengtuo oilfield

Remaining oil distribution of delta reservoirs in waterflooding oilfield is very complicated, which is resulted from the differences of petrophysical characteristics in different facies of reservoir. Taking 7 and 8 sand groups in the second district of Shengtuo oilfield as the examples, the data of core analysis in reservoir and petrophysical characteristics of rock have some influences on the distribution of remaining oil. The delta reservoir in this area is considered to have serious water wettability with continuous waterflooding development. The rock capillary in different facies sandbody and different position is obviously different, which brings about complicated distribution of remaining oil. The analysis of core and log data shows that average values of cross points on the relative permeability curves are higher, and shape of curves is irregular. There is littler span in common permeable region in oil and water phases. Therefore there is serious water wettability in delta reservoir in the area.