岩性油气藏 ›› 2017, Vol. 29 ›› Issue (6): 7683.doi: 10.3969/j.issn.1673-8926.2017.06.010
陈志强1, 吴思源1, 白蓉2, 雷刚3
CHEN Zhiqiang1, WU Siyuan1, BAI Rong2, LEI Gang3
摘要: 四川盆地广安地区须家河组致密砂岩气储层非均质性极强,使得孔隙度与渗透率相关性差,难以通过单一的孔隙度与渗透率回归模型准确计算渗透率。因此,利用859块标准柱塞样物性分析数据,根据流动单元指数(FZI)由小到大,划分出了5类流动单元,并建立了相应的孔隙度与渗透率统计回归模型,每种类型流动单元的孔隙度与渗透率相关性良好。为了使用这组分类统计模型,需要连续的FZI来划分整个目的层段的流动单元类型。为此,选择了20块典型样品开展高压压汞与核磁共振联测实验。基于联测实验数据,得到了利用核磁共振测井计算Swanson参数、利用Swanson参数计算储层品质因子(RQI)、利用RQI计算FZI的转换模型,实现了FZI的连续定量评价,最终实现了研究区致密砂岩气储层流动单元类型的连续划分及其渗透率的测井评价。现场应用结果表明:利用核磁共振测井计算FZI与岩心分析FZI较为接近,该方法可有效解决FZI连续定量评价的问题;相比于单一的孔隙度和渗透率回归模型与核磁Coates模型,流动单元分类的渗透率计算结果与岩心分析渗透率吻合度更高,该方法有效地提高了渗透率测井评价的准确度。上述方法在类似的致密砂岩气储层渗透率测井评价中具有推广价值。
中图分类号:
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