Impact of laminae on pore structures of lacustrine shales in the southern Songliao Basin, NE China

Liu, D.; Li, Zhuo; Jiang, Zhenxue; Zhang, Chen; Zhang, Ziya; Wang, Jianbo; Yang, Dongxu; Yan, Song; Luo, Qun

doi:10.1016/j.jseaes.2019.103935

Cited by 38 publications

(19 citation statements)

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“…Previous studies revealed that clay minerals provide a higher surface area and pore volume, which enhance the complicated pore structure. 33,46 Meanwhile, Shahezi shale has a higher clay mineral content according to the results of XRD and is an important controlling factor for the development of pores. 7,9,28 However, the micro-PV and SA of kerogen samples are negatively associated with micro-Δα (Figure 16a and 16b).…”

Section: Resultsmentioning

confidence: 99%

“…5,7 Liu et al (2019) analyzed the organic and inorganic pore sizes with SEM experiments, demonstrating that the triangular, rectangular, or polygonal intraP pores can be observed in clay with an about 50 nm pore diameter. 46 Meanwhile, for brittle minerals with strong crush resistance ability, the higher the quartz content, the more the interP pores are preserved and connected, indicating that the Δα values of the macro−mesopores decrease (Figure 17c). In Figure 17d, the Δα values of the meso−macropores in bulk shale show a moderate positive correlation with the clay content.…”

Section: Resultsmentioning

confidence: 99%

“…The tectonic evolution of the CFD is consistent with the Songliao Basin and includes five tectonic stages: a breaking period, breaking conversion period, occupation period, reverse period, and shrinking period. 9,46 Previous research indicates that the Shahezi Formation is composed of dark gray and greyish black muddy shales, gray silty mudstones, and sandy conglomerates with local coal seams. 7,9 According to different structures and the depositional environment of the Shahezi Formation, the sedimentary filling pattern of the CFD has a domino semigraben-type sequence sedimentary filling pattern, an asymmetric graben-type sequence sedimentary filling pattern, and a rolling semigraben-type sequence sedimentary filling pattern.…”

Section: Geologic Settings and Samplesmentioning

confidence: 99%

“…48 Pore space is imperative for hydrocarbon migration and reservoir space analysis, and many studies on pore space have been conducted using the SEM method. [4][5][6][7]15,17,37,46 The microstructure morphology of the shale samples was assessed using a Zeiss SUPRA 55 Sapphire with the secondary electron (SE) and an EDS at the Institute of Geology and Geophysics at the Chinese Academy of Sciences. Before this experiment, a group of samples was cut into blocks, and the surface of each sample was bombarded with an argon-ion beam to smooth the surface.…”

Section: Experimental and Theoriesmentioning

confidence: 99%

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Nanopores Structure and Multifractal Characterization of Bulk Shale and Isolated Kerogen—An Application in Songliao Basin, China

Liang

Jiang

et al. 2021

Energy Fuels

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Understanding the anisotropy-controlling factors of shale within organic matter can provide novel insight into the transport process and gas storage in typical shale. A series of techniques, such as low-temperature CO2/N2 adsorption (LP CO2/N2), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and reflected light microscopy (RLM), has been used to characterize the pore structure characteristics and the heterogeneity of the pore size distribution. In this study, LP gas adsorption experiments of the Shahezi Formation in the Changling Fault Depression, Songliao Basin, China were conducted to calculate the multifractal parameter Δα (the multifractal spectral width) and H (Hurst exponent) and investigate the pore structure and heterogeneity characteristic. The results demonstrate that the pore volume (PV) and surface area (SA) of the kerogen samples have a range of 0.045–0.131 cm3/g and 18.921–135.707 m2/g which are 1.180–3.066 fold and 1.431–5.583 fold greater than those of the volume and surface area of the corresponding bulk shale samples, respectively. The Δα value of the bulk shale samples are similar to the corresponding isolated kerogen samples in the micropores, whereas the value of the isolated kerogen samples of Δα are higher than that of the bulk shale samples in the meso-macropores. The PV and SA have similar influences on the multifractal parameters, suggesting that the multifractal parameters are closely related to the pore structure parameters and significant for evaluating the development of pores in shale. The clay and quartz contents have an obvious impact on the heterogeneity of the nanopore structure in the full pore size of the Shahezi shale. Other factors, such as the TOC content and R o, play an inconspicuous role in the pore structure–heterogeneity connection. On the basis of SEM, EDS, and RLM imaging, OM pores show significant heterogeneities among different kerogen particles. According to the pore geometrical morphology and genetic types, the main controlling factors of the heterogeneity kerogen pores can be summarized as the remaining original kerogen pores and differences in hydrocarbon generation potential.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Geologic Settings and Samplesmentioning

confidence: 99%

Section: Experimental and Theoriesmentioning

confidence: 99%

See 2 more Smart Citations

Nanopores Structure and Multifractal Characterization of Bulk Shale and Isolated Kerogen—An Application in Songliao Basin, China

Liang

Jiang

et al. 2021

Energy Fuels

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“…Contrary to the conventional reservoir, the shale pore structure is characterized with a quite wide range by nanoscale to macroscale and shows a more complicated and heterogeneous pore network, as well as low porosity and permeability [5]. It is well understood that it closely links the pore structures to the oil and gas transport mechanism and storage capabilities in the shale [6]. The pore structure can support important parameters, including the pore volume (PV), pore surfer area (SA), average pore diameter (APD), and pore size distribution (PSD), which have been executed by many researchers [1,4,7].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Pore Structure and Multifractal Characteristics of Shale Reservoirs through N2 Adsorption: An Application in the Triassic Yanchang Formation, Ordos Basin, China

Liang

Jiang

et al. 2021

Geofluids

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To understand the pore structure and heterogeneity of pore size distribution (PSD) is essential for revealing fluid mechanics and evaluating the utilization of unconventional resources. In this study, there are multiple shale examples collected from the Chang 7 section in the Ordos Basin for the investigation was conducted on the basis of various experiments on total organic carbon (TOC), X-ray diffraction (XRD), and nitrogen gas adsorption, through scanning electron microscopy (SEM) and multifractal method. The multifractal characteristic parameters, including the width of singularity spectra ( Δ α ), Hurst exponent ( H ), D 1 / D 0 , and nitrogen gas adsorption, were used to find out about the characteristics of pore development and to quantify the complexity and heterogeneity of pore structure. Depending on the exact mineral composition, the Yanchang Formation of Chang 7 shales is classified into either silty mudstone (SM) or muddy siltstone lithofacies (MS). According to the investigative results, the Chang 7 lacustrine shale features a complex pore system with the pores ranging from 1.5 to 10 nm in diameter. Besides, mesopores contribute significantly to the total pore volume (TPV) and total surface area (TSA). As for TPV and TSA of the SM lithofacies in the samples under investigation, they are nearly 1.09–1.78 and 0.80–1.72 times greater as compared to the MS lithofacies samples. The dominant types of reservoir spaces include organic matter (OM) pore and interparticle pore which are related to inorganic minerals. The value of Δ α is higher for MS lithofacies than for SM lithofacies, indicating a greater heterogeneity of PSD in the MS lithofacies. The pore structure of MS lithofacies is determined mainly by TOC and siliceous mineral content, whereas the influencing factors for SM lithofacies are TOC and clay mineral content. There is a significant relationship between multifractal parameters and pore structure parameters for both SM and MS lithofacies. The TOC of SM and MS lithofacies exhibits a close correlation with Δ α , suggesting that the pores in organic matter are dominated by those nanopores with a complex and heterogeneous pore structure. The rock composition of the lithofacies can affect Δ α to a varying extent, which means that the minerals have an evident impact on the heterogeneity of MS and SM lithofacies.

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Role of bedding planes played in enhancing dissolution in sandstones

et al. 2022

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Impact of laminae on pore structures of lacustrine shales in the southern Songliao Basin, NE China

Cited by 38 publications

References 91 publications

Nanopores Structure and Multifractal Characterization of Bulk Shale and Isolated Kerogen—An Application in Songliao Basin, China

Nanopores Structure and Multifractal Characterization of Bulk Shale and Isolated Kerogen—An Application in Songliao Basin, China

Investigation into the Pore Structure and Multifractal Characteristics of Shale Reservoirs through N2 Adsorption: An Application in the Triassic Yanchang Formation, Ordos Basin, China

Role of bedding planes played in enhancing dissolution in sandstones

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