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- Title
准噶尔盆地乌尔禾组凝灰岩孔隙特征及其主控因素.
- Authors
柳忠泉; 曾治平; 胡海燕; 赵乐强; 朱根根; 李松涛; 李凌
- Abstract
In order to clarify the characteristics and main controlling factors of the pore structure of tuffs in the Urho Formation of the Dongdaohaizi depression, the pore size of full-size pores of tuffs was characterized based on low-temperature carbon dioxide adsorption, nitrogen adsorption and high-pressure mercury pressure experiments. The tuff mudstone mainly existed conical tube pores, conical plate pores with open ends and narrow parallel plate pores. Pore size has the multi-peak distribution, the total pore volume of the tuff mudstone ranges from 0. 005 4 to 0. 047 8 cm³ / g, with a large of various types of pores. The pore volume of the tuffs is mainly provided by mesopores, which ranges from 0. 004 2 to 0. 041 3 cm³ / g with the average of 0. 026 cm³ / g and accounts for 75. 10%, followed by micropores and macropores. Micropores range from 0. 000 6 to 0. 005 5 cm³ / g with the mean of 0. 003 1 cm³ / g, and macropore change from 0. 000 6 to 0. 005 3 cm³ / g with the average of 0. 002 8 cm³ / g and account for 11. 5% and 13. 4% respectively. The specific surface area of tuffaceous mudstone is mainly provided by micropores and mesopores. The tuff microporous fractal dimension Dm ranges from 2. 59 to 2. 97, mesopore fractal dimension D1 from 2. 23 to 2. 55 and mesopore fractal dimension D2 from 2. 62 to 2. 83, reflecting the pore strong inhomogeneity of the tuffaceous mudstone. The TOC and clay minerals are the main controlling factors for pore in the tuffs, with quartz and feldspar being less important.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 35, p14964
- ISSN
1671-1815
- Publication type
Article