Petroleum Exploration and Development >
Response laws of rock electrical property and saturation evaluation method of tight sandstone
Received date: 2019-05-20
Revised date: 2019-11-20
Online published: 2020-02-19
Supported by
Supported by Major Research Project of PetroChina Company Limited(2019A-3608);Project of National Natural Science Foundation of China(41874152)
To solve the problem that the law of rock electrical response under low and medium water saturation in tight sandstone reservoirs is not clear, an experimental method of high-speed centrifugal displacement rock electricity and nuclear magnetic resonance T2 spectrometry under different water saturation was proposed, which can drive the tight sandstone cores with the permeability less than 0.1×10 -3 μm 2, and provide a reliable experimental means for the study of tight sandstone electrical property. By carrying out supporting experiments such as high-resolution CT scan, MAPS and Qemscan, a multi-mineral component fine three-dimensional digital core based on multi-source information fusion was constructed. The finite element numerical simulation method was used to obtain the electrical response of tight sandstone core with low water saturation which cannot be obtained in laboratory conditions. By combining experiment and numerical simulation, the electrical response laws have been clear of tight sandstone with complex pore structure, and the saturation evaluation method of variable rock electrical parameters based on pore structure has been developed. The processing of logging data of multiple wells in tight sandstone reservoir of Chang 7 Member in the Ordos Basin shows that this method can obtain more accurate oil saturation, and provides a new idea and method for fine logging evaluation of tight sandstone reservoir.
Xia LI , Chaoliu LI , Bo LI , Xuefeng LIU , Chao YUAN . Response laws of rock electrical property and saturation evaluation method of tight sandstone[J]. Petroleum Exploration and Development, 2020 , 47(1) : 214 -224 . DOI: 10.1016/S1876-3804(20)60020-9
| [1] | ZHAO Zhengzhang, DU Jinhu. Exploration and development of unconventional oil and gas resources of reality: Tight oil and gas. Beijing: Petroleum Industry Press, 2012: 1-10. |
| [2] | ZOU Caineng, TAO Shizhen, HOU Lianhua , et al. Unconventional petroleum geology. Beijing: Geological Publishing House, 2011. |
| [3] | SUN Longde, ZOU Caineng, JIA Ailin , et al. Development characteristics and orientation of tight oil and gas in China. Petroleum Exploration and Development, 2019,46(6):1015-1026. |
| [4] | DU Jinhu, HE Haiqing, YANG Tao , et al. Progress in China’s tight oil exploration and challenges. China Petroleum Exploration, 2014,19(1):1-9. |
| [5] | YAO Jingli, DENG Xiuqin, ZHAO Yande , et al. Characteristics of tight oil in Triassic Yanchang Formation, Ordos Basin. Petroleum Exploration and Development, 2013,40(2):150-155. |
| [6] | LI Chaoliu, LI Changxi, HOU Yuting , et al. Well logging evaluation of Triassic Chang 7 Member tight reservoirs, Yanchang Formation, Ordos Basin, NW China. Petroleum Exploration and Development, 2015,42(5):608-614. |
| [7] | ZHANG Shaonan, DING Xiaoqi . Characters and causes of tight sandstones of Yanchang Formation in southern Ordos Basin, China. Journal of Chengdu University of Technology (Science & Technology Edition), 2010,37(4):386-390. |
| [8] | ZENG Wenchong. New technology of oil-gas reservoir logging evaluation. Beijing: Petroleum Industry Press, 1991. |
| [9] | YAN Jianping, WEN Danni, LI Zunzhi , et al. The influence of low permeable sandstone pore structure on rock electrical parameters and its applications. Natural Gas Geoscience, 2015,26(12):2227-2233. |
| [10] | SUN Jianguo . Archie’s formula: Historical background and earlier debates. Progress in Geophysics, 2007,22(2):472-484. |
| [11] | HU Shengfu, ZHOU Cancan, LI Xia , et al. A tight sandstone trapezoidal pore oil saturation model. Petroleum Exploration and Development, 2017,44(5):827-836. |
| [12] | LI Xia, ZHAO Wenzhi, ZHOU Cancan , et al. Dual-porosity saturation model of low-porosity and low- permeability clastic reservoirs. Petroleum Exploration and Development, 2012,39(1):82-91. |
| [13] | MAO Zhiqiang, GAO Chuqiao . Theoretical simulation of the resistivity and pore structure of hydrocarbon bearing rocks. Petroleum Exploration and Development, 2000,27(2):87-90. |
| [14] | SWANSON B F . Microporosity in reservoir rocksits measurement and influence on electrical resistivity. Texas: SPWLA 26th Annual Logging Symposium, 1985. |
| [15] | CRANE S D . Impacts of microporosity, rough pore surface and conductive minerals on saturation calculations form electric measurements: An extended Archie's Law. Louisiana: SPWLA 31st Annual Logging Symposium, 1990. |
| [16] | MAO Zhiqiang, ZHANG Chengguang . The study of capillary and electrical properties of porous rock samples at reservoir conditions. Progress in Geophysics, 1995,10(1):76-89. |
| [17] | ZHANG Minglu, SHI Yujiang . On Archie’s electrical parameters of sandstone reservoir with complicated pore structures. Well Logging Technology, 2005,29(5):446-448. |
| [18] | WANG Xiujuan, WANG Minglei, ZHAO Aibin . Microscopic characteristics of chang7 tight sandstone reservoir in Ordos Basin. Lithologic Reservoirs, 2014,26(3):79-83. |
| [19] | CUI Jingwei, ZHU Rukai, WU Songtao , et al. Heterogeneity and lower oily limits for tight sandstones: A case study on Chang-7 oil layers of the Yanchang Formation, Ordos Basin. Acta Petrolei Sinica, 2013,34(5):877-882. |
| [20] | WANG Xucheng, SHAO Min. The basic principles of finite element method and numerical methods. 2nd ed. Beijing: Tsinghua University Press, 1997. |
| [21] | CHEN Xidong, YANG Jie, ZHAO Xiaodong , et al. The status and development of finite element method. Manufacture Information Engineering of China, 2010,39(11):6-8. |
| [22] | XIAO Lizhi. The technology and application of magnetic resonance imaging logging and rock NMR. Beijing: Science Press, 1998. |
| [23] | YAN Jianping, HE Xu, GENG Bin , et al. Nuclear magnetic resonance T2 spectrum multifractal characteristics and pore structure evaluation. Applied Geophysics, 2017,14(2):205-215. |
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