NMR On-Line Measurement of Stress Sensitivity of Tight Matrix Limestone Cores in a Karstic Reservoir

doi:10.11938/cjmr20170210

Abstract

Abstract: Compared to the conventional reservoirs, karstic carbonate reservoir has more complex structure, larger difference in the size of fracture cavity, and the property that the fracture functioning mainly as a way for communication. It is difficult to study flow characteristics and distribution in karstic carbonate reservoir with the conventional methods. In this paper, we had built an on-line NMR instrument to test the stress sensitivity of 15 Tahe Oilfield tight matrix limestone cores. The T₂ spectrum was measured at each stage. On the basis of the T₂ spectra measured, the pore size, porosity and permeability changes of the limestone rocks were determined. It was shown that the on-line NMR measurement technology can be employed in the laboratory tests to provide microscopic information on the changes of core permeability.

Key words: stress sensitivity, T₂ spectrum, permeability, low-field NMR, tight matrix limestone

CLC Number:

O482.53

LIU Zhong-chun, CHENG Qian, LIU Nai-gui, ZHOU Yang, FANG Tao, ZHU Tao-tao, WANG Wei-min. NMR On-Line Measurement of Stress Sensitivity of Tight Matrix Limestone Cores in a Karstic Reservoir[J]. Chinese Journal of Magnetic Resonance, 2017, 34(2): 206-213.

References

[1] LANG D J, SHANG G H, LV C Y, et al. Experiment and application of NMR in carbonate reservoir analysis:An examplefrom Tahe oilfield[J]. Oil & Gas Geology, 2009, 30(3):363-369. 郎东江, 尚根华, 吕成远, 等. 碳酸盐岩储层核磁共振分析方法的实验及应用——以塔河油田为例[J]. 石油与天然气地质, 2009, 30(3):363-369.
[2] MARICA F, CHEN Q, HAMILTON A, et al. Spatially resolved measurement of rock core porosity[J]. J Magn Reson, 2006, 178(1):136-141.
[3] KOMAI T, SAKAMOTO Y, NAKASHIMA Y, et al. NMR measurement and analysis of porosity and permeability for hydrate-bearing sediments[C]. India:Proceedings of The Eighth ISOPE Ocean Mining Symposium Chennai, 2009.
[4] YU Z L, XIONG W, GAO S S, et al. Stress sensitivity analysis of low-permeability reservoirs[J]. Natural Gas Technology, 2008, 2(4):26-29, 78. 于忠良, 熊伟, 高树生, 等. 低渗透储层应力敏感分析[J]. 天然气技术, 2008, 2(4):26-29, 78.
[5] WANG Z H, CHEN G, LI S H, et al. Application of NMR core experimental analysis in evaluation of low-porosity and low-permeability sandstone reservoirs[J]. Petroleum Geology and Experiment, 2014, 36(6):773-779. 王振华, 陈刚, 李书恒, 等. 核磁共振岩芯实验分析在低孔渗储层评价中的应用[J]. 石油实验地质, 2014, 36(6):773-779.
[6] 王为民. 核磁共振岩石物理研究及其在石油工业中的应用[D]. 武汉:中国科学院武汉物理与数学研究所, 2001.
[7] XIAO L, LIU X P, MAO Z Q. A computation method for reservoir permeability by combining NMR log and capillary pressure data[J]. Acta Petrolei Sinica, 2009, 30(1):100-103. 肖亮, 刘晓鹏, 毛志强. 结合NMR和毛管压力资料计算储层渗透率的方法[J]. 石油学报, 2009, 30(1):100-103.
[8] GU C C, WANG W M, GUO H K, et al. Experimental research of cuttings analysis using nuclear magnetic resonance technology[J]. Chinese J Magn Reson, 2002, 19(3):281-288. 谷长春, 王为民, 郭和坤, 等. 现场岩屑核磁共振分析技术的实验研究[J]. 波谱学杂志, 2002, 19(3):281-288.
[9] ZENG L B, SHI C G, WANG Y K, et al. The pressure sensitivity of fractures and its development significance for extra low-permeability sandstone reservoirs in ordos basin[J]. Engineering Science, 2007, 9(11):35-38. 曾联波, 史成恩, 王永康, 等. 鄂尔多斯盆地特低渗透砂岩储层裂缝压力敏感性及其开发意义[J]. 中国工程科学, 2007, 9(11):35-38.
[10] 李仙枝, 宋公仆. EMRT核磁测井在碳酸盐岩储层评价中的应用[J]. 国外测井技术, 2014, 6:18-22.
[11] LI H B, ZHU J Y, GUO H K. Methods for calculating pore radius distribution in rock from NMR T₂ spectra[J]. Chinese J Magn Reson, 2008, 25(2):273-280. 李海波, 朱巨义, 郭和坤. 核磁共振T₂谱换算孔隙半径分布方法研究[J]. 波谱学杂志, 2008, 25(2):273-280.
[12] XIAO Z L, PU C S, QIN W L. Experiment on stress sensitivity in low permeability sandstone reservoir[J]. Fault-Block Oil and Gas Field, 2008, 15(2):47-48. 肖曾利, 蒲春生, 秦文龙. 低渗砂岩油藏压力敏感性实验研究[J]. 钻采工艺, 2008, 15(2):47-48.
[13] PENG S L, YE C H, LIU M L. Measurement of permeability of porous rock using NMR T₂ relaxation distribution[J]. Chinese J Magn Reson, 2006, 23(2):271-282. 彭石林, 叶朝辉, 刘买利. 多孔介质渗透率的NMR测定[J]. 波谱学杂志, 2006, 23(2):271-282.
[14] WANG J L, LIU Y Z, CHEN M Q, et al. Experimental study on dynamic imbibition mechanism of low permeability reservoirs[J]. Petroleum Exploration and Development, 2009, 36(1):86-90. 王家禄, 刘玉章, 陈茂谦, 等. 低渗透油藏裂缝动态渗吸机理实验研究[J]. 石油勘探与开发, 2009, 36(1):86-90.
[15] XIAO L Z. Some important issues for nmr logging applications in China[J]. Well Logging Technology, 2007, 31(5):401-407. 肖立志. 我国核磁共振测井应用中的若干重要问题[J]. 测井技术, 2007, 31(5):401-407.
[16] SHAO W Z, DING Y J, LIU Y, et al. The application of nmr log data in evaluation of reservoir pore structure[J]. Well Logging Technology, 2009, 33(1):52-56. 邵维志, 丁娱娇, 刘亚, 等. 核磁共振测井在储层孔隙结构评价中的应用[J]. 测井技术, 2009, 33(1):52-56.
[17] WANG L Q, LIU H Q, ZHEN S G, et al. Quantitative research on stress sensitivity of low-permeability reservoir[J]. Acta Petrolei Sinica, 2009, 30(1):96-99, 103. 王厉强, 刘慧卿, 甄思广, 等. 低渗透储层应力敏感性定量解释研究[J]. 石油学报, 2009, 30(1):96-99, 103.
[18] JIAO C Y, HE S L, XIE Q, et al. An experimental study on stress-dependent sensitivity of ultra-low permeability sandstone reservoirs[J]. Acta Petrolei Sinica, 2011, 32(3):489-494. 焦春艳, 何顺利, 谢全, 等. 超低渗透砂岩储层应力敏感性实验[J]. 石油学报, 2011, 32(3):489-494.