常规及非常规储层岩石分形特征对渗透率的影响

doi:10.3969/j.issn.1673-8926.2017.04.010

岩性油气藏 ›› 2017, Vol. 29 ›› Issue (4): 81–90.doi: 10.3969/j.issn.1673-8926.2017.04.010

常规及非常规储层岩石分形特征对渗透率的影响

尹帅¹, 谢润成^2,3, 丁文龙⁴, 单钰铭^2,3, 周文^2,3

1. 西安石油大学地球科学与工程学院, 西安 710065;
2. 油气藏地质及开发工程国家重点实验室, 成都 610059;
3. 成都理工大学能源学院, 成都 610059;
4. 中国地质大学能源学院, 北京 100083

收稿日期:2016-04-05 修回日期:2016-05-25 出版日期:2017-07-21 发布日期:2017-07-21
第一作者:尹帅(1989-),男,博士,讲师,主要从事石油构造及裂缝评价方面的研究工作。地址:(100083)北京市海淀区学院路29号中国地质大学(北京)。Email:speedysys@163.com
通信作者: 谢润成(1979-),男,教授,主要从事油气藏工程地质评价方面的教学与研究工作。Email:xieruncheng06@cdut.cn
基金资助:
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）及“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

Influences of fractal characteristics of reservoir rocks on permeability

YIN Shuai¹, XIE Runcheng^2,3, DING Wenlong⁴, SHAN Yuming^2,3, ZHOU Wen^2,3

1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu Universtiy of Technology, Chengdu 610059, China;
3. College of Energy, Chengdu University of Technology, Chengdu 610059, China;
4. School of Energy Resources, China University of Geosciences, Beijing 100083, China

Received:2016-04-05 Revised:2016-05-25 Online:2017-07-21 Published:2017-07-21

摘要/Abstract

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。

关键词: 边界断裂, 构造特征, 油气成藏, 赛汉塔拉凹陷, 二连盆地

Abstract: In order to characterize the pore structure of different types of reservoirs and cognize its influence on rock permeability,based on the mercury intrusion,nuclear magnetic resonance(NMR)and N₂ adsorption experiments,the fractal characteristics of sandstone,coal and shale were compared and analyzed by using the fractal theory, the equivalent capillary tortuosity models were established, and the influences of fractal characteristic parameters of conventional and unconventional reservoir rocks on permeability were discussed. The results show that the fractal dimension(D_f)of the three kinds of rocks is in the range of 2.6-3.0,the capillary average tortuosity fractal dimension(D_T)is in the range of 1.1-2.3,and the fractal dimension is negatively correlated with rock permeability. The microscopic pore structure factors that influence the rock permeability include heterogeneity of the rock,pore throat size distribution,pore surface roughness and capillary tortuosity,among which the capillary tortuosity has the biggest influence on rock permeability. The equivalent capillary tortuosity of coal,sandstone and shale is relatively small, medium and big, respectively. Finally, the theory of fractal model was used to forecast the permeability of 39 sets of rock samples,the prediction results of sandstone and coal are good. But for shale with strong heterogeneity, its permeability reached nD level. Although the prediction results have a certain degree of coincidence,the prediction accuracy still needs to be further improved. The knowledge obtained in this paper has important reference value in in-depth knowing microscopic percolation mechanism of different kinds of reservoirs.

Key words: boundary fault, structural characteristics, hydrocarbon accumulation, Saihantala Sag, Erlian Basin

中图分类号:

TE312

尹帅, 谢润成, 丁文龙, 单钰铭, 周文. 常规及非常规储层岩石分形特征对渗透率的影响[J]. 岩性油气藏, 2017, 29(4): 81–90.

YIN Shuai, XIE Runcheng, DING Wenlong, SHAN Yuming, ZHOU Wen. Influences of fractal characteristics of reservoir rocks on permeability[J]. Lithologic Reservoirs, 2017, 29(4): 81–90.

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常规及非常规储层岩石分形特征对渗透率的影响

Influences of fractal characteristics of reservoir rocks on permeability

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