COMPARATIONS BETWEEN MERCURY INTRUSION AND GAS ADSORPTION FOR PORE STRUCTURE CHARACTERISTICS OF SHALE
LI Zhiqing1,2,3, SHEN Xin2,3, QI Zhiyu2,3, HU Ruilin2
1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology), Chengdu 610059;
2. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
3. University of Chinese Academy of Sciences, Beijing 100049
According to the differences of pore structure characteristics between marine and continental shale in China, the Weiyuan and Jiao Shiba marine shale and Yaoqu continental shale are selected to test. The main test methods contain thin section analysis, mineral and main quantity analysis, low field scanning microscopy, mercury injection and gas adsorption. Based on the research results of pore structure characteristics and controlling factors, the new standards of pore size naming are put forward. The pores are divided into <2nm, 2~100nm, 0.1~1μm, 1~10μm, 10~100μm,>100μm. They are respectively called ultramicropore, micropore, small hole, middle hole, big hole, and capillary hole. The sample porosity development degree from high to low in turn are 2#, 5#, 1#, 6#, 4# in 2~100nm pore range. The samples porosity development degree from high to low in turn are 2#, 1#, 4#, 6#, 5# in 10~100μm pore range. Pore distribution uniformity coefficient hu is proposed. Micro-nano pore of sample 2 and sample 5 are more development comparing to other samples. Also gas storage capacity of sample 2 and sample 5 are stronger. The test results of N2 adsorption, CO2 adsorption by using DFT model and mercury intrusion can be unified to attain continuous distribution of nanometer pore.
. COMPARATIONS BETWEEN MERCURY INTRUSION AND GAS ADSORPTION FOR PORE STRUCTURE CHARACTERISTICS OF SHALE[J]. Journal of Engineering Geology, 2017, 25(6): 1405-1413.
Chen J,Zhou G Y,Zhao X L,et al. 2005. Overview of study methods of reservoir rock pore structure[J]. Special Oil and Gas Reservoirs, 12 (4):11~14.
Chen S B,Xia X H,Qin Y,et al. 2013. Classification of pore structures in shale gas reservoir at the Longmaxi Formation in the south of Sichuan Basin[J]. Journal of China Coal Society, 38 (5):760~765.
Hou Y G,He S,Yi J Z,et al. 2014. Effect of pore structure on methane sorption capacity of shales[J]. Petroleum Exploration and Development, 41 (2):248~256.
Ji L M,Qiu J L,Xia Y Q,et al. 2012. Micro-pore characteristics and methane adsorption properties of common clay minerals by electron microscope scanning[J]. Acta Petrolei Sinica, 33 (2):249~256.
Keller J U,Staudt R. 2005. Gas adsorption equilibra:experimental methods and adsorptive isotherms[M]. USA:Springer Science:1~422.
Sing K S W,Everett D H,Haul R A W,et al. 1984. IUPAC Recommendations 1984,Reporting physisorption data for gas solid systems with special reference to the determination of surface area and porosity[J]Pure & Appl. Chem., 57:603~619.
Wang L,Chen Y Y,Liu Y X. 2014. Shale porous structural characteristics of Longmaxi formation in Pengshui area of Southeast Sichuan Basin[J]. China Petroleum Exploration, 19 (5):80~88.
Wang S. 2009. Analysis of rock pore structural characteristic by nuclear magnetic resonance[J]. Xinjiang Petroleum Geology, 30 (6):768~771.
Wang X Z. 2014. Lacustrine Shale Gas[M]. Beijing:Petroleum Industry Press.
Washburn E W. 1921. The dynamics of capillary flow[J]. Physical Review(SeriesⅠ), 17 (2):273~279.
Xie X Y,Tang H M,Wang C H,et al.,2006. Contrast of nitrogen adsorption method and mercury porosimetry method in analysis of shale's pore size distribution[J]. Natural Gas Industry, 26 (12):100~102.
Xoaotb B B. 1966. Coal and Gas Outburst(Song S Z,Wang Y A,Translation)[M]. Beijing:China Industry Press.
Ying F X,Yang S S,Zhang M,et al. 2002. Application of laser scanning confocal microscope to the measurement of pore texture in reservoirs[J]. Acta Sedimentologica Sinica, 20 (1):75~79.
Zhong T X. 2012. Characteristics of pore structure of marine shales in south China[J]. Natural Gas Industry, 32 (9):1~4.
Zou C N,Yang Z,Zhang G S,et al. 2014. Conventional and unconventional petroleum "orderly accumulation":concept and practical significance[J]. Petroleum Exploration and Development, 41 (1):14~27.
Zou C N,Zhu R K,Bai B,et al. 2011. First discovery of nano-pore throat in oil and gas reservoir in China and its scientific value[J]. Acta Petrologica Sinica, 27 (6):1857~1864.