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Global Geology 2020, 23(4) 234-240 DOI:
10.3969/j.issn.1673-9736.2020.04.04 ISSN: 1673-9736 CN: 22-1371/P |
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| 论文 |
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Experimental study on parameter determination of fluid replacement equation for volcanic reservoirs |
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ZHOU Weiyi, PAN Baozhi, GUO Yuhang |
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College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China |
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摘要：
In this study, the parameters of Gassmann equation based on fluid replacement theory are studied by measuring the acoustic velocity during the evaporation process of volcanic rocks in Nanpu area. The experimental data show that with the decrease of porosity of tight volcanic rock, the acoustic velocity difference between dry and wet rock samples increases, which is conducive for the identification of gas bearing reservoirs with acoustic log data. The fluid bulk modulus distribution of volcanic rocks in the study area conforms to Brie model, and the value of empirical coefficient e is related to lithology. The experimental results show that there is a linear relationship between the P-wave transit time of dry and wet rock samples. Using porosity to calculate the acoustic transit time of saturated rock samples, and taking it into the experimental formula, we can get the P-wave transit time and bulk modulus of dry rock samples. According to the bulk modulus of mixed fluid, dry rock and rock matrix determined by experiments, the saturation of volcanic reservoir in Nanpu area is calculated by Gassmann equation, which is in good contrast with the conclusion of gas test. This study provides an experimental basis for quantitative evaluation of volcanic gas reservoirs using seismic and acoustic logging data. |
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关键词：
volcanic rock
acoustic velocity
Gassmann equation
parameter determination
saturation calculation
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Experimental study on parameter determination of fluid replacement equation for volcanic reservoirs |
|
|
ZHOU Weiyi, PAN Baozhi, GUO Yuhang |
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|
College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China |
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|
Abstract:
In this study, the parameters of Gassmann equation based on fluid replacement theory are studied by measuring the acoustic velocity during the evaporation process of volcanic rocks in Nanpu area. The experimental data show that with the decrease of porosity of tight volcanic rock, the acoustic velocity difference between dry and wet rock samples increases, which is conducive for the identification of gas bearing reservoirs with acoustic log data. The fluid bulk modulus distribution of volcanic rocks in the study area conforms to Brie model, and the value of empirical coefficient e is related to lithology. The experimental results show that there is a linear relationship between the P-wave transit time of dry and wet rock samples. Using porosity to calculate the acoustic transit time of saturated rock samples, and taking it into the experimental formula, we can get the P-wave transit time and bulk modulus of dry rock samples. According to the bulk modulus of mixed fluid, dry rock and rock matrix determined by experiments, the saturation of volcanic reservoir in Nanpu area is calculated by Gassmann equation, which is in good contrast with the conclusion of gas test. This study provides an experimental basis for quantitative evaluation of volcanic gas reservoirs using seismic and acoustic logging data. |
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Keywords:
volcanic rock
acoustic velocity
Gassmann equation
parameter determination
saturation calculation
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收稿日期 2020-02-27 修回日期 2020-03-31 网络版发布日期 |
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DOI: 10.3969/j.issn.1673-9736.2020.04.04 |
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基金项目:
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通讯作者: GUO Yuhang |
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作者简介: |
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作者Email: 124563749@qq.com |
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| 参考文献： |
Biot M A. 1956. Theory of propagation of elastic waves in a fluid-saturated porous solid. I. Low-frequency range. The Journal of the Acoustical Society of America, 28(2):168-178.
Brie A, Pampuri F, Marsala A F, et al. 1995. Shear sonic interpretation in gas-bearing sands//Conference:Annual meeting of the Society of Petroleum Engineers (SPE), Dallas, TX (United States), 22-25 Oct 1995.
Domenico S N. 1976. Effect of brine-gas mixture on velocity in an unconsolidated sand reservoir. Geophysics, 41(5):882-894.
Dou Y, Gui Z X, Gao G, et al. 2015. Analysis of factors influencing fluid substitution based on Gassmann equation. Progress in Geophysics, 30(5):2150-2156. (in Chinese with English abstract)
Fang C H, Pan B Z, Liu S H, et al. 2015. Experimental study and application on effect of gas saturation on P-wave velocity. Progress in Geophysics, 30(4):1673-1676. (in Chinese with English abstract)
Gassmann F. 1951. Elastic wave through a packing of spheres. Geophysics, 16(4):673-685.
Geertsma J, Smit D C. 1961. Some aspects of elastic wave propagation in fluid-saturated porous solids. Geophysics, 26(2):169-181.
Hill R J. 1963. Elastic properties of reinforced solids. some theoretical principles. Journal of the Mechanics and Physics of Solids, 11(5):357-372.
Kahraman S. 2007. The correlations between the saturated and dry P-wave velocity of rocks. Ultrasonics, 46(4):341-348.
Lin K, He Z H, Xiong X J, et al. 2009. Fluid replacement process based on Gassmann equation. Journal of Yangtze University (Natural Science Edition), 6(1):180-181, 205, 391. (in Chinese)
Shi G, Shen W L, Yang D Q. 2003. The relationship of wave velocities with saturation and fluid distribution in pore space. Chinese Journal of Geophysics, 46(1):138-142. (in Chinese with English abstract)
Si W P, Di B R, Wei J X. 2017. Seismic physical modeling and gas saturation prediction of partially-saturated gas sand reservoir. Chinese Journal of Geophysics, 60(4):1547-1556. (in Chinese with English abstract)
Wang D X. 2016. Study on the rock physics model of gas reservoirs in tight sandstone. Chinese Journal of Geophysics, 59(12):4603-4622. (in Chinese with English abstract) |
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| 1．PING Zhilan, WANG Li, ZHANG Yajing, XIN Wei, LI Liang, QIAN Lingyu.Geochronology, geochemistry and geological significance ofEarly Cretaceous volcanic rocks from Niangniangshan Formation,Ningwu Basin, middle and lower reaches of the Yangtze River[J]. Global Geology, 2020,23(1): 1-15 |
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