大斜度井挖潜断层边部剩余油实践

Practice of Tapping the Potential of Remaining Oil on the Edge of Faulted Zone in Big-inclination Wells

应用井震结合技术对大庆长垣油田储层构造进行了深入研究,对断层的分布认识更加细致。断层附近局部区域剩余油仍相对富集,是进一步挖潜的重点。对断层边部剩余油潜力进行了评估,明确了影响断层边部剩余油富集程度的影响因素;利用数值模拟技术研究分析了断层边部储层动用情况,断层上下盘对采出程度没有影响,剩余油潜力主要分布在非主力油层中,断距大的断层附近剩余油更为富集。在井震结合三维精细地质研究成果基础上,优选潜力区域、找准剩余油富集部位,对大斜度井井轨迹进行优化设计,近年来已设计投产42口大斜度井,取得了很好的开发效果。

The reservoir structure of Daqing Placanticline Oilfield was deeply studied by using the technology of combination of well logging with seismic data,more careful understanding of the fault distribution was realized.The remaining oil was relatively enriched in the local areas nearby the faults,which was the key point for further tapping the potential.Remaining oil potential nearby the faults was evaluated and the influence factor about remaining oil concentration was clarified.The reserves producing degree on the edge of faults was studied by means of reservoir numerical simulation technique,the result indicated that there was no influence on the producing degree on the upper and lower wall of the faults,the potential of remaining oil was mainly distributed in non-principal reservoirs,remaining oil nearby faults with long distance was more enriched.Based on the study of three dimensional and fine geological study of well logging combined with seismic data,the potential areas are chosen,the locations of remaining oil enrichment is established,the well trajectory of big-inclination wells is optimized and the technology has been used in 42inclined wells and good effect is obtained in oil exploitation.