Experimental on the pore structure characteristics of Longmaxi Formation shale in southern Sichuan Basin, China

Huang, Linlin; Liu, Xiangjun; Xiong, Jian; Liang, Lixi

doi:10.1016/j.petlm.2020.07.006

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…Conversely, the fractal dimension of the Longmaxi shale in southern Sichuan goes up with quartz content, which partly originates from siliceous organisms. 61 In this study, the D 2 value is positively correlated with shale's quartz content (r = 0.6068). The quartz in the Dalong Formation shale is primarily an authigenic quartz.…”

Section: Factors Affecting the Fractal Dimensionsupporting

confidence: 54%

Pore Structure and Fractal Dimension in Marine Mature Silicon-Rich Shale of the Dalong Formation in Western Hubei

Liu,

Zhu,

Qiao

et al. 2024

ACS Omega

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How shale reservoirs and gas contents are affected by the pore structure of shale is very important. Low-temperature nitrogen isothermal adsorption experiments were conducted by us to investigate the pore structure of the Dalong Formation shale. We measured the specific surface area and fractal dimension of the pores and also considered the mineral fraction and organic matter content of the rock. The results show that the Dalong Formation shale contains a lot of organic carbon, with a total organic carbon (TOC) value between 1.20 and 10.82% (mean: 5.02%). Quartz and clay minerals are the main components of the shale, with quartz making up 40.30 to 85.60% (mean: 67.21%) and clay minerals making up 9.20 to 34.10% (mean: 20.26%) of the shale. Most of the pore space in the shale of the Dalong Formation is formed by intragranular and intergranular pores, organic matter pores, and some microfissures. The pore structure is complex, with parallel-plate and ink-bottle pores being the most common types. Most of the pores are 0−2 or 2−5 nm in size. D 1 and D 2 are the fractal dimensions, with averages of 2.66 and 2.81, respectively. D 1 can range from 2.55 to 2.78, while D 2 can range from 2.66 to 2.94. The TOC content, mineral composition, and pore structure characteristics determine the fractal dimension. Higher levels of the TOC content, quartz mineral content, and specific pore surface area result in a higher fractal dimension, while higher levels of feldspar content result in a lower one. There is no apparent correlation to clay minerals or other mineral compositions.

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Section: Factors Affecting the Fractal Dimensionsupporting

confidence: 54%

Pore Structure and Fractal Dimension in Marine Mature Silicon-Rich Shale of the Dalong Formation in Western Hubei

Liu,

Zhu,

Qiao

et al. 2024

ACS Omega

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“…To obtain a description of the external surface area and to calculate the micropore volume of materials that are mainly formed by micropores, the method known as the deBoer t-plot [67,143] appears to be an acceptable option and has been used in shales [123,144]. Finally, one of the methods that appears to be gaining popularity is the application of the Frenkel-Halsey-Hill (FHH) theory for the study of the fractal dimensions of shales [113,145,146].…”

Section: Other Methodsmentioning

confidence: 99%

Use of Gas Adsorption and Inversion Methods for Shale Pore Structure Characterization

Medina-Rodriguez

Alvarado

2021

Energies

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The analysis of porosity and pore structure of shale rocks has received special attention in the last decades as unconventional reservoir hydrocarbons have become a larger parcel of the oil and gas market. A variety of techniques are available to provide a satisfactory description of these porous media. Some techniques are based on saturating the porous rock with a fluid to probe the pore structure. In this sense, gases have played an important role in porosity and pore structure characterization, particularly for the analysis of pore size and shapes and storage or intake capacity. In this review, we discuss the use of various gases, with emphasis on N2 and CO2, for characterization of shale pore architecture. We describe the state of the art on the related inversion methods for processing the corresponding isotherms and the procedure to obtain surface area and pore-size distribution. The state of the art is based on the collation of publications in the last 10 years. Limitations of the gas adsorption technique and the associated inversion methods as well as the most suitable scenario for its application are presented in this review. Finally, we discuss the future of gas adsorption for shale characterization, which we believe will rely on hybridization with other techniques to overcome some of the limitations.

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“…The N 2 adsorption amount was obtained by measuring the sample under equilibrium vapor pressure at a low temperature (77 K) and low pressure. Subsequently, using the BET theory, a relative pressure (p/p 0 ) of 0.05-0.35 MPa was used to determine the SSA of shale (Zhang et al, 2015). The equivalent PV can then be calculated using the BJH model at various relative pressures based on the volume of liquid nitrogen injected into pores of various sizes (Liu et al, 2018).…”

Section: Low-temperature Adsorption Experimentsmentioning

confidence: 99%

New insights into the evaluation criteria for high-quality deep marine shale gas reservoirs in the Longmaxi formation: Evidence from organic matter pore development characteristics

Zhu

Meng²,

Pan³

et al. 2023

Front. Ecol. Evol.

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Porosity, total organic carbon content, brittle mineral content, and gas content are now the primary references for classifying and evaluating marine shale gas reservoirs in China. Is there a more effective and appropriate reservoir classification scheme for deep marine shale? The Longmaxi Formation in Luzhou, southern Sichuan Basin, China, is the main object of study. Quantitative analysis and modeling using data from field emission scanning electron microscopy, nitrogen adsorption, and logging were used to characterize organic matter (OM) pore multi-scale development and reveal the relationship between OM pore and the high-quality reservoirs. Microscopic and macroscopic indications from OM pores show that a large number of OM pores were developed in high-quality reservoirs. OM surface porosity occupancy of the high-quality reservoir in the Luzhou area was more than 60%. OM porosity occupancy was more than 50%. The nitrogen adsorption–desorption hysteresis loops demonstrate the development of bottleneck and wedge-shaped OM pores. Characterization of multi-scale pore structure by box dimension, pore volume and specific surface area. It is found that the key to the formation of high-quality reservoirs was the massive development of OM mesopores in siliceous shale and the relatively homogeneity structure, which was conducive to the enrichment and migration of shale gas. Furthermore, the improved model decreased the relative error in predicting the OM porosity by about 32.5%. The use of OM porosity occupancy for high-quality reservoir classification was better, and the results were consistent with geological understanding. OM porosity occupancy showed that the area from Lunanxi to Luzhou to Rongchang to Jiangjin was the key exploration area for high-quality reservoirs in southern Sichuan. This study is expected to provide a new idea for OM pore modeling analysis and deep marine shale gas reservoir classification.

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Experimental on the pore structure characteristics of Longmaxi Formation shale in southern Sichuan Basin, China

Cited by 14 publications

References 33 publications

Pore Structure and Fractal Dimension in Marine Mature Silicon-Rich Shale of the Dalong Formation in Western Hubei

Pore Structure and Fractal Dimension in Marine Mature Silicon-Rich Shale of the Dalong Formation in Western Hubei

Use of Gas Adsorption and Inversion Methods for Shale Pore Structure Characterization

New insights into the evaluation criteria for high-quality deep marine shale gas reservoirs in the Longmaxi formation: Evidence from organic matter pore development characteristics

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