Akekule Formation of Triassic developed delta front subaqueous distributary channels in Tahe area.The channel sand matched with the low amplitude structure and formed low amplitude structural lithologic complex traps.However,due to the rapid change of the lateral migration of the channel,thin sand,strong heterogeneity,and other factors,the reservoir prediction accuracy needs higher requirements,which restricts the development effectiveness.In view of such a situation,the authors used the high precision 3D data and, on the basis of forward modeling and reflection analysis,extracted multiple attributes under the constraint of sequence frame. In combi-nation with stratigraphic slice method,the authors clearly determined seismic reflection characteristics in this area,described the river boundary form,divided the river stage and predicted the thickness of river channel.The results show that the application of multiple at-tributes analysis and stratigraphic slice can accurately identify the boundary of river channel,and divide the period of river channel to improve the accuracy of reservoir prediction.%塔河地区三叠系阿克库勒组发育三角洲前缘水下分流河道.河道砂体与低幅度构造匹配,形成了低幅度构造岩性复合圈闭.但由于河道砂体横向迁移变化快、砂体厚度薄、非均质强等原因,对储层预测精度提出了更高的要求,也制约了开发效果.基于此,笔者利用新采集的高精度三维资料,在模型正演、反射特征分析基础上,进行层序格架约束下多种属性提取,并结合地层切片等方法,明确了该地区河道砂地震反射特征类型,准确刻画了河道边界形态,最终完成河道期次划分,储层厚度预测.研究结果表明:应用多属性分析、地层切片等方法能准确识别河道边界,划分河道期次,提高储层预测精度.
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