新疆油页岩升温过程中孔隙结构演化特征

doi:10.13278/j.cnki.jjuese.20230033

Abstract

Abstract: Pore structure is an important feature of oil shale, which directly affects the storage and transport of shale oil and gas. Therefore, studying the evolution of pore structure is of great significance to guide the in-situ exploitation of oil shale. In this paper, taking Balikun oil shale as the research object, based on thermogravimetric (TG), low-temperature nitrogen adsorption (LTNA) and mercury intrusion porosimetry (MIP) tests, combined with LTNA-MIP joint accurate characterization methods, to reveal the law of pyrolysis weight loss and pore development characteristics of Balikun oil shale during heating, and study the evolution process and mechanism of pore structure. The results show that the thermal weight of Xinjiang oil shale can be divided into low temperature slow weight loss section (20-360 ℃), medium temperature rapid weight loss section (360-500 ℃), and high temperature slow weight loss section (500-600 ℃). The internal pore types of Balikun oil shale are complex, and during the heating process, the micro and small pores evolve from slit type to conduit shape. The medium and large holes are always mainly inkbottle-shaped. The inkbottle-shaped pores developed intensively in the two temperature ranges of 300-400 ℃ and 500-600 ℃, and the effective pores developed in large quantities at 400-500 ℃. Native macropores dominated the low-temperature section, and the pore structure changed little under the combined influence of free water vapor pressure, mineral thermal expansion, and asphaltene softening. The concentrated pyrolysis of organic matter in the middle temperature section produces a pore expansion effect, the pore volume is significantly increased, and the pore type is mainly mesoporous. The expansion pressure is generated by the water loss of clay minerals and the phase change of quartz in the high temperature section, and the large pores and middle pores are further expanded.

Key words: oil shale, pore structure evolution, mercury intrusion porosimetry, low-temperature nitrogen adsorption, joint characterization, Xinjiang

CLC Number:

P618.12

Zhang Wen, Lan Sheng, Ma Wenliang, Wang Jia. Study on the Evolution of Pore Structure Characteristics of Xinjiang Oil Shale During the Heating Progress[J].Journal of Jilin University(Earth Science Edition), 2023, 53(6): 1689-1705.

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Study on the Evolution of Pore Structure Characteristics of Xinjiang Oil Shale During the Heating Progress

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