叠前方位各向异性技术在潜山储层裂缝预测中的应用

Quantitative prediction to fractured reservoir in buried hill based on pre-stack amplitude azimuthal anisotropy

裂缝型碳酸盐岩储层非均质性极强,储层类别以高角度缝为主。在油田开发中如何精准刻画储层空间展布特征,寻找构造高部位剩余油是亟需解决的难题。通过叠前方位各向异性技术对潜山中小型裂缝进行预测,结合地层微电阻率扫描成像(FMI)裂缝解释结果进行标定和分级刻画,进一步应用三维可视化及自动追踪技术实现对储集裂缝体的空间定量雕刻,精准落实裂缝体空间分布及连通性。该技术在某油田的实际应用结果表明,使用该方法预测的裂缝体结果与后续实际验证井的钻遇情况相符。此研究对开发后期高含水潜山裂缝型油藏有效挖潜剩余油具有很好的指导作用。

Fractured carbonate reservoirs are highly heterogeneous, and the reservoir types are dominated by highangle fractures. How to accurately characterize the spatial distribution characteristics of reservoirs in oilfield development and find remaining oil in structural highs is an urgent problem to be solved. Regarding carbonate buried hill fracture reservoir as research object, technology of quantitative prediction to delineate fracture reservoir in buried hill was applied using pre-stack azimuthal anisotropy. Different azimuth seismic amplitude attributes were used to predict fracture intensity by ellipse fitting, and then cross-plot analysis of predicted fracture intensity and interpreted single well Formation Microscanner Image(FMI) fracture were conducted to obtain fracture intensity cutoff values of fracture reservoir of different scales. Eventually, the purpose of quantitative carbonate fracture reservoir delineation can be achieved in combination with 3D visualization seed point tracking technology. Practical application shows that the method could enhance fracture reservoir exploration reliability, and the prediction was proved by drilling results.