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沉积学报  2015 

复合辫状河道期次划分方法与沉积演化过程分析——以鄂尔多斯盆地苏里格气田西区苏X区块为例

DOI: 10.14027/j.cnki.cjxb.2015.04.016, PP. 773-785

Keywords: 辫状河,苏里格气田西区,复合辫状河道,单期河道,沉积演化过程

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Abstract:

多期截切叠置的河道砂体中各单期河道的解剖向来是砂体建筑结构分析中的重点也是难点.如何从多期叠置的大块砂体中识别出单期河道并进行平面组合,进而完成辫状河的沉积演化过程分析是一个值得探索的课题.研究过程中,笔者充分利用岩芯、测录井、野外露头和现代卫星图片等资料,在标志层拉平基础上,通过“去压实效应邻井单期河道标定法”和“连续取芯验证法”,完成复合河道分期.在河道去压实效应过程中,采用了“松弛回弹技术”对河道进行了复位,为单期划分建立了基础.在垂向单期解剖基础上,结合现代沉积和经典地质概念模式,采用“单期砂厚中心连线法”,完成单期河道平面延伸轨迹的追踪和对比,然后按单期沉积发育顺序,完成复合辫状河道沉积演化过程与历史重建.研究结果表明,该方法将有助于揭示砂体空间叠置与局部砂体富集规律,提高砂体的钻遇率,便于后期水平井的大规模部署与地质导向等工程作业的实施,为油田生产实践提供理论依据.

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