Study on Influence of Permeability and Distribution of Pore Diameters in Rock Cores on Measurement of Mobile Fluid Saturation

doi:10.11885/j.issn.1674-5086.2016.04.25.01

Abstract

Abstract: To understand why the calculation of original oil saturation through mercury injection capillary pressure (MICP) curves always yields excessively large values, we measured the mobile fluid saturation of a set of selected samples using nuclear magnetic resonance (NMR), high-speed centrifugation, and conventional mercury injection experiments. Comparisons were then performed to analyze how the mobile fluid saturation in different pore diameter ranges differed from the MICP-measured value of mobile fluid saturation, to reveal the underlying causes of these differences. The experimental results indicated that, in ultralow-permeability reservoir cores (0.1 mD < K < 1.0 mD), MICP-measured saturation was significantly larger than NMRmeasured mobile fluid saturation. Our analysis revealed that this was caused by differences in the quantity of injected mercury and the volume of mobile fluids (as measured by NMR), because of the restrictions imposed by small pore throats. In lowpermeability reservoir cores (1.0 mD < K < 10.0 mD), MICP measurements of mobile fluid saturation may still result in larger values than the corresponding NMR measurements. In reservoir cores with high levels of permeability (K > 10.0 mD), the difference between the MICP-measured saturation and the total mobile fluid saturation was relatively small. In this case, it was found that both the injected mercury and mobile fluids were mainly distributed within pore throats with radii greater than 1.00 μm.

Key words: NMR, conventional MICP measurements, sandstones, mobile fluid saturation, original oil saturation

CLC Number:

TE311

NING Ning, LI Yichao, LIU Honglin, ZHOU Shangwen. Study on Influence of Permeability and Distribution of Pore Diameters in Rock Cores on Measurement of Mobile Fluid Saturation[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 91-97.

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References

[1] 李振涛. 利用核磁共振二维谱技术研究岩心含油饱和度[D]. 北京:中国科学院研究生院, 2011. LI Zhentao. Using two dimensional NMR technologies to research core oil saturation[D]. Beijing:Graduate University of Chinese Academy Sciences, 2011.
[2] 杨正明,骆雨田,何英,等. 致密砂岩油藏流体赋存特征及有效动用研究[J]. 西南石油大学学报(自然科学版), 2015, 37(3):85-92. doi:10.11885/j.issn.1674-5086.2015.03.07.04 YANG Zhengming, LUO Yutian, HE Ying, et al. Study on occurrence feature of fluid and effective development in tight sandstone oil reservoir[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2015, 37(3):85-92. doi:10.11885/j.issn.1674-5086.2015.03.-07.04
[3] 廖作才,孙军昌,杨正明,等. 低渗火山岩气藏可动流体百分数及其影响因素[J]. 西南石油大学学报(自然科学版), 2014, 36(1):113-120. doi:10.11885/j.issn.-1674-5086.2012.02.16.02 LIAO Zuocai, SUN Junchang, YANG Zhengming, et al. Study on the movable fluid saturation and its influencing factors of low permeability volcanicgas reservoir[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2014, 36(1):113-120. doi:10.11885/j.-issn.1674-5086.2012.02.16.02
[4] 黄延章. 低渗透油层渗流机理[M].北京:石油工业出版, 1998.
[5] 刘曰强,乔向阳,袁昭. 用核磁共振研究低渗储层渗流能力及驱替机理[J]. 吐哈油气, 2004, 9(3):277-279. LIU Yueqiang, QIAO Xiangyang, YUAN Zhao. Study on percolation capability and displacement mechanism with nuclear magnetic resonance technique[J]. Tuha Oil & Gas, 2004, 9(3):277-279.
[6] 郭公建,谷长春. 核磁共振岩屑含油饱和度分析技术的实验研究[J]. 波谱学杂志, 2005, 22(1):67-72. doi:10.3969/j.issn.1000-4556.2005.01.010 GUO Gongjian, GU Changchun. Oil saturation in rock cuttings measured by nuclear magnetic resonance[J]. Chinese Journal of Magnetic Resonance, 2005, 22(1):67-72. doi:10.3969/j.issn.1000-4556.2005.01.010
[7] 李硕,郭和坤,刘卫,等. 利用核磁共振技术研究岩心含油饱和度恢复[J]. 石油天然气学报, 2007, 29(2):62-65. doi:10.3969/j.issn.1000-9752.2007.02.015 LI Shuo, GUO Hekun, LIU Wei, et al. Study on oil saturation recovery on cores by using Nuclear Magnetic Resonance (NMR)[J]. Journal of Oil and Gas Technology, 2007, 29(2), 62-65. doi:10.3969/j.issn.1000-9752.-2007.02.015
[8] MUNN K, SMITH D M. A NMR technique for the analysis of pore structure:Numerical inversion of relaxation measurements[J]. Journal of Colloid & Interface Science, 1987, 119(1):117-126. doi:10.1016/0021-9797(87)90250-5
[9] 李芳,邹筱春,冯艳丽,等. 核磁共振录井含油饱和度的测量与校正[J]. 录井工程, 2009, 20(1):11-14. doi:10.3969/j.issn.1672-9803.2009.01.003 LI Fang, ZOU Xiaochun, FENG Yanli, et al. Measurement and correction for oil bearing saturation in nuclear magnetic resonance logging[J]. Mud Logging Engineering, 2009, 20(1):11-14. doi:10.3969/j.issn.1672-9803.-2009.01.003
[10] 耿斌. 核磁共振测井在低渗透油藏储量评价中的应用[J]. 测井技术, 2006, 30(4):320-322. doi:10.3969/-j.issn.1004-1338.2006.04.009 GENG Bin. The application of NMR logging in low permeability reserves evaluation[J]. Well Logging Technology, 2006, 30(4):320-322. doi:10.3969/j.issn.1004-1338.2006.04.009
[11] 余光华. 核磁共振测井分析原始含油饱和度误差及地质成因分析[J]. 石油天然气学报, 2008, 30(1):266-268. YU Guanghua. Analysis on errors and geologic genesis of initial oil saturation by NMR[J]. Journal of Oil and Gas Technology, 2008, 30(1):266-268.
[12] 王为民,郭和坤,叶朝辉. 利用核磁共振可动流体评价低渗透油田开发潜力[J]. 石油学报, 2001, 22(6):40-44. doi:10.7623/syxb200106009 WANG Weimin, GUO Hekun, YE Chaohui. The evaluation of development potential in low permeability oilfield by the aid of NMR movable fluid detecting technology[J]. Acta Petrolei Sinica, 2001, 22(6):40-44. doi:10.7623/-syxb200106009
[13] 丁绍卿,郭和坤,刘卫,等. 核磁共振岩样分析技术在储层评价中的应用[J]. 大庆石油地质与开发, 2006, 25(6):22-23, 26. doi:10.3969/j.issn.1000-3754.2006.-06.007 DING Shaoqing, GUO Hekun, LIU Wei, et al. Application of NMR rock sample analysis technique in reservoir evaluation[J]. Petroleum Geology & Oilfield Development in Daqing, 2006, 25(6):22-23, 26. doi:10.3969/j.issn.1000-3754.2006.06.007
[14] 刘红现,许长福,胡志明. 用核磁共振技术研究剩余油微观分布[J]. 特种油气藏, 2011, 18(1):96-97, 125. doi:10.3969/j.issn.1006-6535.2011.01.027 LIU Hongxian, XU Changfu, HU Zhiming. Research on microcosmic remaining oil distribution by NMR[J]. Special Oil & Gas Reservoirs, 2011, 18(1):96-97, 125. doi:10.3969/j.issn.1006-6535.2011.01.027
[15] 潘和平,王兴,樊政军,等. 储层原始含油饱和度计算方法研究[J]. 现代地质, 2000, 14(4):451-453. doi:10.3969/j.issn.1000-8527.2000.04.011 PAN Heping, WANG Xing, FAN Zhengjun, et al. Computing method of reservoir originality oil saturation[J]. Geoscience, 2000, 14(4):451-453. doi:10.3969/j.issn.1000-8527.2000.04.011
[16] 李烨,司马立强,吴丰,等. 注汞压力对致密砂岩储层物性下限分析的影响[J]. 西南石油大学学报(自然科学版), 2015, 37(5):79-84. doi:10.11885/j.issn.1674-5086.2013.08.29.06 LI Ye, SIMA Liqiang, WU Feng, el al. Influence of mercury injection pressure on lower limits analysis of tight sandstone reservoirs[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2015, 37(5):79-84. doi:10.11885/j.issn.1674-5086.2013.08.29.06
[17] WORTHINGTON P F. Character of water saturation algorithms through dual-salinity desaturation[J]. The Log Analyst, 1996, 37(1):31-46.
[18] 栾海波,林景晔,崔月霞,等. 砂岩储层原始含油饱和度的求取与发展[J]. 大庆石油地质与开发, 2008, 27(5):18-20. doi:10.3969/j.issn.1000-3754.2008.05.005 LUAN Haibo, LIN Jingye, CUI Yuexia, et al. Resolving and advance of original oil saturation in sandstone reservoirs[J]. Petroleum Geology & Oilfield Development in Daqing, 2008, 27(5):18-20. doi:10.3969/j.issn.1000-3754.2008.05.005
[19] 孙庆和,何玺,林海. 特低渗透油藏可动油的测量及应用[J]. 大庆石油地质与开发, 1999, 18(6):35-37. doi:10.3969/j.issn.1000-3754.1999.06.012 SUN Qinghe, HE Xi, LIN Hai. Measurement and application of movable oil in very low permeable reservoir[J]. Petroleum Geology & Oilfield Development in Daqing, 1999, 18(6):35-37. doi:10.3969/j.issn.1000-3754.1999.-06.012
[20] 赵国欣,朱家俊,关丽. 用毛管压力资料求取原始含油饱和度的方法[J]. 中国石油大学学报(自然科学版), 2008, 32(4):38-41. doi:10.3321/j.issn:1673-5005.2008.04.008 ZHAO Guoxin, ZHU Jiajun, GUAN Li. Method of applying capillary pressure data to calculate initial oil saturation[J]. Journal of China University of Petroleum, 2008, 32(4):38-41. doi:10.3321/j.issn:1673-5005.2008.04.008
[21] 刘曰强,朱晴,梁文发,等. 利用核磁共振技术对丘陵油田低渗储层可动油的研究[J]. 新疆地质, 2006, 24(1):52-54. doi:10.3969/j.issn.1000-8845.2006.01.012 LIU Yueqiang, ZHU Qing, LIANG Wenfa, et al. Research on the movable oil in reservoirs with low permeability in Qiuling Oilfield with nuclear magnetic resonance technology[J]. Xinjiang Geology, 2006, 24(1):52-54. doi:10.-3969/j.issn.1000-8845.2006.01.012
[22] 王瑞飞,孙卫,杨华. 特低渗透砂岩油藏水驱微观机理[J]. 兰州大学学报(自然科学版), 2010, 46(6):29-33. doi:10.13885/j.issn.0455-2059.2010.06.012 WANG Ruifei, SUN Wei, YANG Hua. Micro mechanism of water drive in ultra-low permeability sandstone reservoir[J]. Journal of Lanzhou University (Natural Sciences), 2010, 46(6):29-33. doi:10.13885/j.issn.0455-2059.2010.06.012
[23] 杨正明,张英芝,郝明强,等. 低渗透油田储层综合评价方法[J]. 石油学报, 2006, 27(2):64-67. doi:10.-7623/syxb200602013 YANG Zhengming, ZHANG Yingzhi, HAO Mingqiang, et al. Comprehensive evaluation of reservoir in low permeability oilfields[J]. Acta Petrolei Sinica, 2006, 27(2):64-67. doi:10.7623/syxb200602013