常规及非常规储层岩石分形特征对渗透率的影响

发布时间：2018-01-07 14:18

本文关键词：常规及非常规储层岩石分形特征对渗透率的影响　出处：《岩性油气藏》2017年04期 　论文类型：期刊论文

【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n D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。
[Abstract]:In order to characterize different types of reservoir pore structure and its influence on permeability, with mercury, NMR and N2 adsorption experiments, based on the fractal theory of fractal characteristics of sandstone, coal and shale are analyzed, the coal rock is built of sandstone, shale, equivalent capillary tortuosity model, discusses the effect of conventional and unconventional reservoir rock fractal parameters on the permeability. The results show that the fractal dimension of coal rock, sandstone, shale is mainly 2.6~3.0, the average capillary tortuosity fractal dimension is mainly 1.1~2.3, fractal dimension and rock permeability is a negative correlation between the microscopic pore structure; influence factors of rock permeability including heterogeneity of rock, pore throat the distribution of pore surface roughness and capillary tortuosity, the influence of capillary tortuosity on rock permeability; coal equivalent capillary tortuosity is small, medium sandstone, shale Great. Finally, carries on the forecast to the 39 groups of samples of rock permeability by using fractal theory model, considers the effect of permeability prediction of sandstone and coal rock are good, but for the strong heterogeneity of the shale, the penetration rate has reached n D, although the forecast result has a certain degree of agreement, but the accuracy still needs to be further improved. This study has a certain reference value to the study of different types of reservoir rock micro seepage mechanism.

【作者单位】：西安石油大学地球科学与工程学院;油气藏地质及开发工程国家重点实验室;成都理工大学能源学院;中国地质大学能源学院;
【基金】：国家自然科学基金项目“硬脆/塑性泥页岩微裂缝产生的岩石物理学机制基础研究”(编号:41572130);“渤海湾盆地济阳坳陷古近系陆相富有机质页岩裂缝研究”(编号:41372139);“中国南方下古生界海相富有机质页岩裂缝发育程度与主控因素定量关系研究”(编号:41072098)联合资助
【分类号】：P618.13;TE31
【正文快照】： 引用:尹帅,谢润成,丁文龙,等.常规及非常规储层岩石分形特征对渗透率的影响.岩性油气藏,2017,29(4):81-90.Cite:YIN S,XIE R C,DING W L,et al.Influences of fractal characteristics of reservoir rocks on permeability.Lithologic Reservoirs,2017,29(4):81-90.0引言分形

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