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沉积学报  2015 

砂质辫状河沉积模式的建立——以委内瑞拉奥里诺科重油带H区块为例

DOI: 10.14027/j.cnki.cjxb.2015.05.012, PP. 965-971

Keywords: 现代沉积,经验公式,水平井,沉积模式,砂质辫状河,奥里诺科重油带

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Abstract:

委内瑞拉奥里诺科重油带H区块Oficina下段发育大面积分布的砂质辫状河沉积,储层内重油资源丰富,拥有巨大的开发潜力。研究区目前尚处于开发前期的油藏评价阶段,平均井距较大且缺少三维地震资料覆盖,仅局部存在一定数量的新钻水平井。考虑到现有资料的实际情况,首先从动态角度分别对心滩砂坝与辫状河道的形成、演化过程予以分析,并重点讨论了活动河道、砂质河道充填、废弃河道充填三种河道存在状态的区别。在此基础上,采用现代沉积类比、经验公式调研、水平井资料应用等手段,对研究区辫状河主要沉积单元的关键参数进行表征,以恢复其发育规模。根据以上研究成果,总结本区的砂质辫状河沉积模式,并在其指导下建立三维地质模型。将该模型与研究区的储层分布预测工作相结合,取得了良好的应用效果,对于后续开发方案的实施以及提高新井的砂岩钻遇率具有重要意义。

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