Pore evolution modeling in natural lacustrine shale influenced by mineral composition: Implications for shale oil exploration and CO2 storage

油页岩 地质学 石油工程 自然(考古学) 地球化学 矿物 作文(语言) 矿物学 岩石学 古生物学 材料科学 冶金 语言学 哲学
作者
Liu Wang,Bo Liu,Longhui Bai,Zhichao Yu,Qiuli Huo,Yifei Gao
出处
期刊:Advances in geo-energy research [Yandy Scientific Press]
卷期号:13 (3): 218-230
标识
DOI:10.46690/ager.2024.09.07
摘要

Describing the organic-inorganic pore evolution influenced by mineral composition is crucial for characterizing shale oil storage capacity and flow in shale, and it also helps predict storage capacity for sequestered CO2. Using laboratory pyrolysis experiments to artificially mature shale samples at relatively high temperatures and short times, this study compares a series of natural samples with different thermal maturations, which can better reflect the real underground pore evolution. A total of 30 natural shales spanning from low to high maturity were collected from the Cretaceous Qingshankou Formation of the Songliao Basin, and the analysis results revealed four main typical shales, namely argillaceous shale, felsic shale, calcareous shale, and mixed shale. The existence of clay minerals, quartz and feldspar promote the development of > 50 nm pores, while 0-20 nm pores are mainly developed in clay minerals and organic matter. When the content of total organic carbon is less than 2.5 wt.%, it displays a positive correlation with the specific surface area, but the correlation becomes negative for samples with a content of total organic carbon greater than 2.5 wt.%. The organic pores are most developed at the peak oil maturity, while inorganic pores are most developed during the oil window, and tend to be stable at high maturity. Argillaceous shale in the high maturity stage may be favorable for petroleum exploration in the Qingshankou Formation of the Songliao Basin. Mixed shale and calcareous shale may not be conducive to the short-term storage of CO2 due to strong reactions with CO2 at the beginning. On the other hand, argillaceous shale and felsic shale may be conducive to the long-term storage of CO2. Document Type: Original article Cited as: Wang, L., Liu, B., Bai, L., Yu, Z., Huo, Q., Gao, Y. Pore evolution modeling in natural lacustrine shale influenced by mineral composition: Implications for shale oil exploration and CO2 storage. Advances in Geo-Energy Research, 2024, 13(3): 218-230. https://doi.org/10.46690/ager.2024.09.07
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