应用井壁取心分析资料评价萨中开发区高台子油层剩余油分布规律

Evaluation of Residual Oil Distribution Rule in Gaotaizi Oil Layer of Sazhong Development Zone Based on Sidewall Coring Data Analysis

摘要: 大庆萨尔图油田萨中开发区高台子油层1982年投入开发，综合含水率93.7%。由于注采井距大、开采井段长及油层的差异性，导致有效油层动用状况差、薄差油层及底部油层动用程度低。为提高油层动用状况、改善油层开发效果、研究适合高含水后期合理的层系井网开发方式，从剩余油微观形成机理研究入手，应用井壁取心岩石热解、饱和烃气相色谱、荧光显微图像分析技术对储层做定量评价，总结萨中开发区高台子油层剩余油分布状况及规律，通过提高厚层、薄差层、表外层水淹程度精细评价水平，形成了极富录井特色的开发调整井评价剩余油的方法。针对各类储层注水开发后形成的剩余油提出了挖潜措施，对于搞清厚油层层内剩余油分布及潜力状况、薄差及表外层的评价进行挖潜增效有着较大的优势，在实际生产中与测井资料结合应用，满足了油藏精细描述技术的需求，为选层射孔及编制开发方案提供了可靠的地质依据。

Abstract: Gaotaizi oil layer of Sazhong Development Zone in Sa’ertu Oilfield of Daqing was put into production in 1982. The comprehensive water cut was 93.7%. The difference of oil layers, long injector-producer space and long production intervals induced poor producing degree of effective reservoirs and low producing degree of thin and bottom oil layers. In order to improve the producing degree and developmental effect of the reservoir, and find out a suitable well pattern for reservoirs at late developmental stage with high water cut, the microscopic formation mechanism of remaining oil was studied, and the reservoirs were quantitatively evaluated by using pyrolysis of rocks from the sidewall coring, gas chromatography of saturated hydrocarbon and fluorescence microscopic image analysis, and the remaining oil distribution status and rules in Gaotaizi Reservoir of Sazhong Development Zone were summarized. The method for evaluating remaining oil in adjustment wells with logging technology is formed by improving the fine evaluation of water flooding degree in thick layers and thin-poor layers. Some measures are proposed for tapping the potential of remaining oil in the reservoir after water flooding development. The research method is of great help in identifying the remaining oil distribution and potential of various oil layers. Combined with electrical logging data, it satisfies the demand of fine reservoir description and provides a reliable geological basis for the selective perforation and design of oilfield developmental scheme.