开发地震在大庆长垣喇嘛甸油田储层预测中的应用

Application of development seismology to reservoir prediction of Lamadian oilfield in Daqing placanticline

以喇嘛甸油田萨尔图油层为例,阐述了地震属性技术和重构地震反演的实践与应用。地震属性技术适合于刻画"泥包砂"型萨一组等的储层特征,尤其是井网控制程度较低的外扩区主河道预测。重构地震反演技术主要适用于高含水油田剩余油挖潜的研究,从而实现高精度井间砂体预测。研究认为,井震联合下的沉积相修正共归纳为河道侧积体、河道连续性(由连续变为间断、由间断变为连续)、河道规模(宽度、延伸长度、走向)、河道组合和河道期次5种模式。由此,利用测井曲线形态差异和高程差等特征,辅助反演切片研究河道垂向演化,最终确定单期河道边界。早期河道和晚期河道错综复杂叠置关系,构成了复杂剩余油空间关系,从而为下一步剩余油采出以及完善注采关系提供了良好的依据。

Taking Saertu oil layer of Lamadian oilfield as an example, this paper discusses the application of seis- mic attribution technique and curve reconstruction and inversion technique. Seismic attribution technique is sui- table for describing characteristics of reservoirs such as Sa I layer with sandstone interbedding in mudstone, es- pecially the main channel sandbody in area with sparse well control. While, curve reconstruction and inversion technique is suitable for highly accurate prediction of inter-well sandbody, thus is critical for tapping remaining oil in oilfield with high water cut. Based on sedimentary facies correction through log/seismic integration, 5 models were built, including channel side accretion, channel continuity, channel size, channel combination and channel timing. Log differences and elevation changes are integrated with inversion slice to characterize the verti- cal evolution of channel sands and finally to determine the boundary of a single channel sandbody. The complex superimposition relationship between early channel sandbody and late channel sandbody determine the compli- cated spatial distribution of remaining oil. These understandingsprovide a solid basis for extracting the remaining oil and improving flood pattern.