露头在密井网区井间砂体预测的应用研究

The Application Research of Outcrop to Predict Inter-well Reservoir in Dense Spacing Area

丘陵油田三间房下油组储层砂体和滦平露头砂体在沉积特征方面具有很好的相似性 ,可将露头地质知识库的相关信息应用在油田研究中。通过地质研究 ,将油田砂体沉积微相进行组合并与露头砂体微相间建立对应关系 ,然后借助露头砂体的小尺度变异特征和通过油田储层得到大尺度变异特征求取合成的变差函数 ,此函数反映了露头和油田砂体的分布特征。在此基础上 ,用序贯指示模拟对油田进行井间预测 ,抽稀检验结果表明 ,水下分流河道砂体钻遇率较高 ,随机模拟 2 0个实现的平均符合率为 89% ;河口坝和前缘砂符合率稍低 ,符合率为 72 % ,但通过调整变差函数参数和模型 ,符合率明显提高。作为对比 ,仅用丘陵油田得到的长程变异特征进行序贯指示模拟 ,砂体平均钻遇率为 5 8%。上述结果表明 。

The sedimentary properties of the Luanping fan-delta outcrop and the lower Sanjianfang formation of Qiuling oilfield are very analogous,and some geological informations from the geological knowledge database of outcrop could be applied in oil field.By geological research,the microfacies of Qiuling oilfield were combined and their correlative relation-ships between outcrop and oilfield were established.By integrating the outcrop variogram functions in a short range with the oilfield variogram functions in a long range,the nested variogram functions reflected the sandstone distribution in different scales.The sequential indicator simulation method was used to predict inter-well sands based on the study.The mean predicted precision from 20 realizations of sands of subaqueous distributary channels was higher than mouth bars,which was 89% and 72% respectively.But the simulation precision of mouth bar was improved after adjusting the parameters of variogram function.As a contrast,the precision of predicting inter-well reservoirs was about 58% when using the oilfield variogram function only in a long range.Those suggested outcrop could be well applied in predicting inter-well reservoirs.