岩性油气藏 ›› 2017, Vol. 29 ›› Issue (4): 8190.doi: 10.3969/j.issn.1673-8926.2017.04.010
尹帅1, 谢润成2,3, 丁文龙4, 单钰铭2,3, 周文2,3
YIN Shuai1, XIE Runcheng2,3, DING Wenlong4, SHAN Yuming2,3, ZHOU Wen2,3
摘要: 为了刻画不同类型储层孔隙结构及其对渗透率的影响,以压汞、核磁共振及N2吸附实验为基础,基于分形理论对砂岩、煤岩及页岩的分形特征进行了分析,建立了砂岩、煤岩、页岩的等效毛管迂曲度模型,探讨了常规及非常规储层岩石分形特征参数对渗透率的影响。结果表明:砂岩、煤岩、页岩的分形维数主要为2.6~3.0,毛管平均迂曲度分形维数主要为1.1~2.3,分形维数大小与岩石渗透率具有负相关性;影响岩石渗透率的微观孔隙结构因素包括岩石的非均质性、孔喉分布、孔隙表面粗糙程度及毛管迂曲度等,其中毛管迂曲度对岩石渗透率的影响最大;煤岩的等效毛管迂曲度较小,砂岩中等,页岩较大。最后,利用分形理论模型对39组岩石样品渗透率进行预测,认为砂岩和煤岩的渗透率预测效果均较好,但对于具有强非均质性的页岩来说,其渗透率已经达到nD级,虽然预测结果具有一定的吻合度,但预测精度仍有待进一步提高。此次研究对深入探讨不同类型储层岩石微观渗流机理具有一定的参考价值。
中图分类号:
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