地震属性分析技术在储层精细描述中的应用

在油气田特高含水期开发中,地震属性分析对井间储层发育特征精确认识及剩余油潜力的精准开发具有非常重要的作用。针对以往地震属性切片优选中存在主观性和不确定性的问题,以大庆萨尔图油田为典型区块,在高保真地震精细处理的基础上,充分利用密井网资料进行质控,建立了基于数理统计的地震属性切片定量优选的方法,大大提高了地震属性优选的精度及效率,井点有效厚度与地震切片属性符合率达到90%以上。结果表明,应用该方法优选了不同沉积环境砂体的地震属性切片,并通过井震联合精准地刻画了三角洲相中窄河道砂体边界和走向,识别了曲流河相中单一河道边界。储层描述成果指导了开发区160口井的补孔压裂措施,措施后单井平均日增油量2.9t,见到较好的开发应用效果,为大庆长垣油田水聚两驱稳油增产提供可靠依据。

Application of the seismic attribute analyzing technique in the fine characterization of the reservoirs

In the development of the ultra-high watercut oil and gas fields, the seismic attribute analysis plays an very important role in the accurate understanding of the reservoir development characteristics between wells and the precise tapping of the residual oil potential. In the light of the problems of the subjectivity and uncertainty in the optimization of the previous seismic attribute slices, taking Daqing Saertu Oilfield as the typical block, based on the fine processing of high-fidelity seismic data, the quality control was fully with the help of the data of the well pattern, and the quantitative optimizing method of the seismic attribute slices was established on the basis of the mathematical statistics, thus the precision and efficiency of the seismic attribute optimization were greatly improved, the coincidence rate between the effective thickness of the well point and the seismic slice attribute was more than 90%. The results show that the seismic slices of the sandbodies in different sedimentary environments were optimized by this method,and with the help of the well-seismic combination, the boundary and direction of the narrow-channel sandbodies in the delta facies were precisely characterized and furthermore the single channel boundary in the meandering river facies was identified. The reservoir described results have guided the perforation-adding and fracturing measures of 160 wells in the development block. After the measures, the average incremental oil for the single well was up to 2.9 t, the development and application results were much better, so the reliable evidence was provided for the production stability and increment of Daqing Placanticline Oilfields flooded by the water and polymer.