Full-scale pores and micro-fractures characterization using FE-SEM, gas adsorption, nano-CT and micro-CT: A case study of the Silurian Longmaxi Formation shale in the Fuling area, Sichuan Basin, China

Gou, Qiyang; Xu, Shang; Hao, Fang; Yang, Feng; Zhang, Baiqiao; Shu, Zhiguo; Zhang, Aihua; Wang, Yuxuan; Lu, Yangbo; Cheng, Xuan; Qing, Jiawei; Gao, Mengtian

doi:10.1016/j.fuel.2019.04.116

Cited by 146 publications

(91 citation statements)

References 46 publications

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“…1a) (Dai et al, 2016;Gou et al, 2018). The study area mainly experienced basement imbricate thrusting, detachment, and left-lateral transpression to form the current anticline structure that is surrounded by faults (Gou et al, 2019a). It is characterized as high buried depth in northeast and low in southwest (She et al, 2016).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

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Quantitative evaluation of free gas and adsorbed gas content of Wufeng-Longmaxi shales in the Jiaoshiba area, Sichuan Basin, China

Gou¹,

Xu²

2019

Adv. Geo-Energ. Res.

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Quantitative analysis of free gas and adsorbed gas contents in shale reservoirs are great significance for efficient exploration and development of shale gas. Based on the isothermal adsorption experiment of shale samples from Wufeng-Longmaxi Formation of JYA well in Jiaoshiba area and Langmuir volume model, the relationship between shale adsorption capacity and temperature, pressure, organic carbon content, quartz and clay mineral content is analyzed. Besides, the key parameters such as Langmuir volume and Langmuir pressure are dynamically calibrated by combining grey correlation method. A new model for calculating adsorbed gas and free gas is established, which takes fully into account the formation temperature, pressure, total organic carbon and shale mineral components. The results showed that the gas content of shale calculated by the new dynamic modified model is in good agreement with the actual gas content characteristics of shale reservoirs. The new model fully takes into account the vertical and horizontal heterogeneity of mineral components and its influence on shale adsorption capacity. That is not only suitable for the tectonic stability area but also for the gas content analysis in the area with strong tectonic movement. It is concluded that the modified calculation model can effectively predict the adsorbed gas, free gas and total gas content of shale reservoirs under formation conditions, which can be used as an indicator for the analysis and prediction of the exploration and development potential of shale gas wells.

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Section: Geological Setting and Samplesmentioning

confidence: 99%

“…The TOC is generally larger than 2.0% with an average of 3.5%. The shales are characterized by high to over-maturity stage, with R o ranges from 2.2%∼3.6%, and kerogen is type I (Gou et al, 2019a). The reservoirs contain abundant nano-submicron pores (Guo, 2016;Guo et al, 2016).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

Quantitative evaluation of free gas and adsorbed gas content of Wufeng-Longmaxi shales in the Jiaoshiba area, Sichuan Basin, China

Gou¹,

Xu²

2019

Adv. Geo-Energ. Res.

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“…The pore diameter varies from 0.3 to 1.5 nm, and there are mainly three peak values of 0.33-0.37, 0.5-0.55, and 0.57-0.63 nm. [58] Nanoscale pores can be characterized using gas adsorption. However, the pore structure measured by gas adsorption may only reflect characteristics in limited areas of porous media because of few experiment data, and the characterization of macropores by gas adsorption is not accurate.…”

Section: Gas Adsorption Methodsmentioning

confidence: 99%

“…The pore diameter varies from 0.3 to 1.5 nm, and there are mainly three peak values of 0.33–0.37, 0.5–0.55, and 0.57–0.63 nm. [ 58 ]…”

Section: Pore Structure Characterizationmentioning

confidence: 99%

Review on Pore Structure Characterization and Microscopic Flow Mechanism of CO₂ Flooding in Porous Media

Tang

Hou

et al. 2020

Energy Tech

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Rapidly rising emissions of greenhouse gases into the atmosphere lead to the greenhouse effect and accelerate the exacerbation of the global climate. [1] Greenhouse gases include carbon dioxide (CO 2), ozone (O 3), nitric oxide (N 2 O), methane (CH 4), hydrogen fluoride, the chlorine carbide class (CFCs, HFCs, HCFCs), and perfluorinated carbide (PFCs) and sulfur hexafluoride (SF 6). The concentration of CO 2 is the highest in the atmosphere among greenhouse gases, and it significantly dominates global warming. [2] The process of the greenhouse effect and the impact of greenhouse gases on global warming are shown in Figure 1. Carbon is one of the most important elements of earth's structure and living things. It widely exists in the biosphere, lithosphere, hydrosphere, and atmosphere and circulates continuously with the movement of the Earth. CO 2 plays an important role in the cycle. Green plants absorb CO 2 from the atmosphere, and CO 2 is converted into organic matter and oxygen is also released through photosynthesis with the participation of water, as shown in Figure 2. [3,4] Before the industrial revolution, the carbon cycle has been kept in balance for millions of years. After the industrial revolution, human beings began to utilize fossil fuels to obtain energy. The balance of nature is thus destroyed, leading to climate anomalies (e.g., global warming) due to the increased concentration of CO 2 caused by the burning of fossil fuels and other industrial activities. Therefore, reducing emissions of CO 2 and other greenhouse gases is essential for protecting the natural environment. [5,6] At present, carbon emissions can be reduced by decreasing energy consumption, improving energy utilization efficiency, replacing fossil fuels with clean energy (e.g., solar energy, wind energy, geothermal energy, and hydrogen energy), and carbon capture and storage (CCS). However, it is still hard for most of the clean energy to completely replace fossil fuels in the near future because of safety, technology availability, and economical efficiency. [7] CCS is an important technological means to reduce carbon emission. [8,9] However, CCS requires high costs and may cause leakage of carbon because the captured carbon is usually sequestrated in saline aquifers, coal seams, depleted reservoirs, etc. [10-12] Therefore, carbon capture, utilization and storage (CCUS) has been acknowledged as a promising technology to achieve efficient reduction of carbon and also generate economic benefits, which is more practical and economical. [13] CO 2 is an important material for industry and has been applied in many fields, as shown in Figure 3. [14,15] In the food industry, CO 2 is used in the production of carbonized beverages, food preservation, and industrial processing as a refrigerant and protective gas. It can also be applied to synthesize chemicals, drugs, polymers, such as degradable plastics, etc. High-purity

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“…The micro-nanometer scale pore morphology and connectivity of shale can be intuitively observed with high resolution equipment, such as Field emission-scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), X-ray computed tomography (X-CT) and atomic force microscopy (AFM) etc. The distribution characteristics of pores can also be analyzed with high resolution images (Jarvie et al, 2007;Gu et al, 2015;Abouelresh, 2017;Gou et al, 2019;Liu et al, 2019). The quantitative techniques mainly include intrusive methods and nonintrusive methods.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterisation of organic matter pores in coal-measure shale

Kong

Xia

et al. 2020

Adv. Geo-Energy Res.

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Full-scale pores and micro-fractures characterization using FE-SEM, gas adsorption, nano-CT and micro-CT: A case study of the Silurian Longmaxi Formation shale in the Fuling area, Sichuan Basin, China

Cited by 146 publications

References 46 publications

Quantitative evaluation of free gas and adsorbed gas content of Wufeng-Longmaxi shales in the Jiaoshiba area, Sichuan Basin, China

Quantitative evaluation of free gas and adsorbed gas content of Wufeng-Longmaxi shales in the Jiaoshiba area, Sichuan Basin, China

Review on Pore Structure Characterization and Microscopic Flow Mechanism of CO₂ Flooding in Porous Media

Microstructural characterisation of organic matter pores in coal-measure shale

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Full-scale pores and micro-fractures characterization using FE-SEM, gas adsorption, nano-CT and micro-CT: A case study of the Silurian Longmaxi Formation shale in the Fuling area, Sichuan Basin, China

Cited by 146 publications

References 46 publications

Quantitative evaluation of free gas and adsorbed gas content of Wufeng-Longmaxi shales in the Jiaoshiba area, Sichuan Basin, China

Quantitative evaluation of free gas and adsorbed gas content of Wufeng-Longmaxi shales in the Jiaoshiba area, Sichuan Basin, China

Review on Pore Structure Characterization and Microscopic Flow Mechanism of CO2 Flooding in Porous Media

Microstructural characterisation of organic matter pores in coal-measure shale

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Product

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Review on Pore Structure Characterization and Microscopic Flow Mechanism of CO₂ Flooding in Porous Media