Pore structure characteristics and evaluation of lacustrine mixed fine-grained sedimentary rocks: A case study of the Lucaogou Formation in the Malang Sag, Santanghu Basin, Western China

Pan, Yongshuai; Huang, Zhilong; Li, Tianjun; Xu, Xiongfei; Chen, Xuan; Guo, Xingwei

doi:10.1016/j.petrol.2021.108545

Cited by 18 publications

(8 citation statements)

References 68 publications

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“…The S-shape of the isotherms indicates that they are type II of the Brunauer-Emmett-Teller classification [60]. This curve shape is observed for many carbohydrate polymer-based films [62][63][64]. Sorption isotherms were characterized by the presence of a slight inflection at low water vapor pressures (a w ≈ 0.1), a more or less inclined middle part, a w from ≈0.1 to 0.7, and a rapid increase in the amount of adsorbed water vapor with a w ≈ 0.7.…”

Section: Water Sorption Isothermsmentioning

confidence: 58%

“…As some authors point out [57][58][59], this is the result of partial absorption of the liquid into the substrate, which reduces the contact angle. Typically, liquid absorption increases and the contact angle decreases with increasing porosity [60,61], pore size [62], and material permeability [59]. Various arrangements and shapes of the pores may also be a factor influencing the penetration of droplets into the material [57].…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

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Effect of Psyllium Husk Addition on the Structural and Physical Properties of Biodegradable Thermoplastic Starch Film

Beer–Lech

Skic

et al. 2022

Materials

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The research subject was the analysis of the microstructure, barrier properties, and mechanical resistance of the psyllium husk (PH)-modified thermoplastic starch films. The tensile tests under various static loading conditions were not performed by researchers for this type of material before and are essential for a more precise assessment of the material’s behavior under the conditions of its subsequent use. The film samples were manufactured by the casting method. PH addition improved starch gelatinization and caused a decrease in failure strain by 86% and an increase in failure stress by 48% compared to pure films. Fourier transform infrared spectroscopy results showed the formation of additional hydrogen bonds between polysaccharides in starch and PH. An increase in the number of hydrophilic groups in the modified films resulted in a faster contact angle decrease (27.4% compared to 12.8% for pure ones within the first 5 s); however, it increased the energy of water binding and surface complexity. The modified films showed the opacity at 600 nm, 43% higher than in the pure starch film, and lower transmittance, suggesting effectively improving barrier properties to UV light, a potent lipid-oxidizing agent in food systems.

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Section: Water Sorption Isothermsmentioning

confidence: 58%

Section: Contact Angle Measurementsmentioning

confidence: 99%

Effect of Psyllium Husk Addition on the Structural and Physical Properties of Biodegradable Thermoplastic Starch Film

Beer–Lech

Skic

et al. 2022

Materials

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“…However, the lacustrine mixed sediment is mainly composed of siliciclastic sediments from rivers, carbonate sediments formed in situ in paleolakes, and volcaniclastics transported by wind. The lacustrine mixed sediment is broadly distributed in China across a wide geological age. − Lacustrine mixed reservoirs have become a new hotspot exploration target for unconventional resources. , As a huge tectonic lake, the Junggar Basin deposited one of the richest source rocks in the world as the Middle Permian Lucaogou Formation (LCG Fm.) .…”

Section: Introductionmentioning

confidence: 99%

Differences between Laminated and Massive Shales in the Permian Lucaogou Formation: Insights into the Paleoenvironment, Petrology, Organic Matter, and Microstructure

Yang

Zeng

Qiao

et al. 2022

ACS Earth Space Chem.

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The Permian Lucaogou Formation (LCG Fm.) in the Junggar Basin is an organic-rich source rock interval formed in a salinized paleolake, and organic-rich laminated and massive shales are broadly deposited. However, the paleoenvironment difference between laminated and massive shales is still unclear, and the effect of this difference on petrology, pore structure, and organic matter enrichment is significant to shale oil resource evaluation. In this study, organic and element geochemistry, mineralogy, and nitrogen adsorption are used to analyze key differences between laminated and massive shales. The results show that most shale samples present mature thermal stage and oil-prone type II kerogen. Felsic igneous rocks in the continental island arc are their primary mineral component sources. The differences between laminated and massive shales are mainly from their silica origin, paleoclimate, and salinity. The silica origin in laminated shale is primarily from the terrestrial debris influx, while the massive shale is mixed with terrestrial debris and biogenic origin. The silica origin from hydrothermal activities is negligible. The laminated shale prefers to be deposited in a hot and dry climate with weak weathering and relatively higher salinity. However, the massive shale is mainly deposited in a warm and humid climate with moderate weathering and lower salinity conditions. For both laminated and massive shales from the LCG Fm., the warm and humid climate is beneficial to organic matter (OM) accumulation. Paleoproductivity presents an increasingly positive impact on source rocks when the rock fabric transforms from massive to thick laminae. Overall, lower salinity, humid climate, and strong terrigenous clastic input jointly enhance organic matter (OM) accumulation in both laminated and massive shales. Arid and semiarid climates are beneficial to improving the fractability of both laminated and massive shales. The laminated shale presents a relatively wider average nanopore diameter and lower pore volume than massive samples. These findings provide an important insight into the correlation between organic enrichment, laminae, pore structure, and depositional environment. This study has profound implications for understanding the formation mechanisms of laminated and massive shales in the lacustrine paleoenvironment.

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“…These methods can be divided into three categories: visual observation, three-dimensional simulation, and quantitative characterization. Visual observation includes microscopic image analysis techniques such as field emission scanning electron microscopy (FE-SEM), ,, focused ion beam SEM, , and wide ion beam SEM; , three-dimensional simulation includes computed tomography (CT), , small-angle neutron scattering, , and synchronous small-angle X-ray scattering; and quantitative characterization includes fluid injection technology based on high-pressure mercury injection (HMPI) ,− and low-temperature gas (N 2 or CO 2 ) adsorption method ,, and non-fluid injection technology represented by nuclear magnetic resonance (NMR). , Due to the different experimental principles and computational models involved in each method, there are limitations in the range of pore sizes and pore structure characteristics that can be reflected. SEM images can intuitively observe the two-dimensional pore structure characteristics of FSRs .…”

Section: Introductionmentioning

confidence: 99%

“…The FMSRs are mainly composed of nanopores and develop complex and diverse lithology, corresponding to the strong heterogeneity of pore throat structure. − Previous studies have been carried out on the lithology classification, diagenesis, and fractal characteristics related to the pore structure of FMSRs. ,,,, However, only a relatively single experiment has been employed for research. There is a lack of multiple experiments to jointly characterize the pore structure of FMSRs on the different scale, and there are few reports on the controlling factors of the pore structure characteristics of FMSRs.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale Pore Structure Characterization of Lacustrine Fine-Grained Mixed Sedimentary Rocks and Its Controlling Factors: A Case Study of Lucaogou Formation in Jimusar Sag

Gao

Wang

et al. 2022

Energy Fuels

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The microscopic pore structure of fine-grained mixed sedimentary rocks (FMSRs) is of great significance for the occurrence mechanism and sweet spot optimization of mixed shale oil. At present, there is no clear understanding of the microscopic pore system of FMSRs and their coupling relationship with rock composition, which restricts the fine understanding of the reservoir forming mechanism of this type of reservoir. Taking the FMSR samples of the Permian Lucaogou Formation in the Jimusar Sag, the southeastern margin of the Junggar Basin, China, as an example, this paper quantitatively characterizes the full-scale pore structure of lacustrine FMSRs by casting thin sections, scanning electron microscopy, low-temperature nitrogen adsorption (LTNA), high-pressure mercury injection, and nuclear magnetic resonance (NMR); analyzes the coupling relationship between the full-scale pore structure and rock composition; and then summarizes the controlling factors. The results showed that the full-scale pore size distribution (PSD) can be revealed by combining the LTNA and NMR methods. The PSDs of FMSRs are evaluated, mostly corresponding to small pores (30–200 nm) and mesopores (200–1500 nm). The sediment grain size, mineral composition, sedimentary environment, and diagenesis jointly controlled the development of FMSR reservoirs. The development of coarser grain components (such as fine sand and arenaceous dolomite), high content of feldspar, low content of clay and calcite, and appropriate content of dolomite (less than 20%) were conducive to high-quality reservoirs. A near-provenance sedimentary pore throat is better. Siltstones, dolomitic siltstones, and dolarenites were mainly developed in shoreland sandy bar, distal sand bar, and dolomitic mud flat microfacies; type I pore throats with residual intergranular pores and dissolved pores are the most favorable for the Lucaogou Formation.

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Pore structure characteristics and evaluation of lacustrine mixed fine-grained sedimentary rocks: A case study of the Lucaogou Formation in the Malang Sag, Santanghu Basin, Western China

Cited by 18 publications

References 68 publications

Effect of Psyllium Husk Addition on the Structural and Physical Properties of Biodegradable Thermoplastic Starch Film

Effect of Psyllium Husk Addition on the Structural and Physical Properties of Biodegradable Thermoplastic Starch Film

Differences between Laminated and Massive Shales in the Permian Lucaogou Formation: Insights into the Paleoenvironment, Petrology, Organic Matter, and Microstructure

Multi-scale Pore Structure Characterization of Lacustrine Fine-Grained Mixed Sedimentary Rocks and Its Controlling Factors: A Case Study of Lucaogou Formation in Jimusar Sag

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