过成熟页岩在半封闭热模拟实验中孔隙结构的演化特征

徐洁; 陶辉飞; 陈科; 张中宁; 王晓锋; 李靖; 郝乐伟

doi:10.3799/dqkx.2019.218

Volume 44 Issue 11

Nov. 2019

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Article Navigation > Earth Science > 2019 > 44(11): 3736-3748

Xu Jie, Tao Huifei, Chen Ke, Zhang Zhongning, Wang Xiaofeng, Li Jing, Hao Lewei, 2019. Evolutionary Characteristics of Pore Structure for Over-Matured Shales in Semi-Closed Thermal Simulation Experiment. Earth Science, 44(11): 3736-3748. doi: 10.3799/dqkx.2019.218

Citation:

Xu Jie, Tao Huifei, Chen Ke, Zhang Zhongning, Wang Xiaofeng, Li Jing, Hao Lewei, 2019. Evolutionary Characteristics of Pore Structure for Over-Matured Shales in Semi-Closed Thermal Simulation Experiment. Earth Science, 44(11): 3736-3748. doi: 10.3799/dqkx.2019.218

Citation:

Xu Jie, Tao Huifei, Chen Ke, Zhang Zhongning, Wang Xiaofeng, Li Jing, Hao Lewei, 2019. Evolutionary Characteristics of Pore Structure for Over-Matured Shales in Semi-Closed Thermal Simulation Experiment. Earth Science, 44(11): 3736-3748. doi: 10.3799/dqkx.2019.218

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Evolutionary Characteristics of Pore Structure for Over-Matured Shales in Semi-Closed Thermal Simulation Experiment

doi: 10.3799/dqkx.2019.218

Xu Jie^{1,2,3
,
,},
Tao Huifei^{1
,
,},
Chen Ke⁴,
Zhang Zhongning¹,
Wang Xiaofeng⁵,
Li Jing¹,
Hao Lewei¹

1.
Key Laboratory of Petroleum Resources of Gansu Province, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2.
Bailie School of Petroleum Engineering, Lanzhou City University, Lanzhou 730000, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Oil & Gas Survey, China Geological Survey, Beijing 100083, China
5.
Department of Geology, Northwest University, Xi'an 710127, China

Received Date: 2019-08-31
Publish Date: 2019-11-15

Abstract

Abstract

In order to study the evolution law of pore structure of over-matured shale, two groups of over-matured shales, which were collected from Cambrian Niutitang Formation and Silurian Longmaxi Formation in the Upper Yangtze region, were selected to carry out semi-closed thermal simulation experiments. Meanwhile, X-ray diffraction analysis, CO₂ and N₂ isotherm adsorption as well as FE-SEM observations were used to determine mineralogical compositions and study the nanopore evolution characteristics. The pore volume of Longmaxi samples increases to the maximum at 500℃, and the pore volume is 1.35 times higher than that of the original sample. The pore volume of shale samples in Niutitang Formation rises to the maximum at 450℃, which is 1.13 times higher than the original sample. Combined with N₂ and CO₂ adsorption data, the micro-meso-macro pore volume of the samples in the two groups was calculated. The micropore volume of the samples in the Niutitang Formation is 1.72 times higher than that in the Longmaxi Formation, and the mesopore volume of the samples in the Longmaxi Formation is 1.44 times higher than that in the Niutitang Formation. These results show that follows (1) The shale of Niutitang Formation has weak hydrocarbon generation potential and high original micropore volume, with little hydrocarbon generation and difficulty in discharging, resulting in relatively poor pore structure improvement.(2) Longmaxi Formation has high quartz content and strong compressive resistance, which is conducive to the development and preservation of meso-macropores, as well as hydrocarbon generation and subsequent extraction, so the pore volume is greatly improved.
- semi-closed thermal simulation experiment,
- evolution of pore,
- Longmaxi Formation,
- Niutitang Formation,
- petroleum geology

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Evolutionary Characteristics of Pore Structure for Over-Matured Shales in Semi-Closed Thermal Simulation Experiment

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