Effect of organic matter on pore structure of mature lacustrine organic-rich shale: A case study of the Triassic Yanchang shale, Ordos Basin, China

Li, Jing; Zhou, Shengyang; Li, Yuanju; Ma, Yu; Yang, Ya‐Nan; Li, Chengcheng

doi:10.1016/j.fuel.2016.07.100

Cited by 106 publications

(74 citation statements)

References 28 publications

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“…6), so did the V<10nm and V10-50 nm (Fig 11). Previous studies generally found PSD curves of mudstone rise after solvent extraction, and the samples in their studies are dominantly lacustrine shale with moderate or relatively high TOC contents, and have high extract production [30,33,81]. Decreases of mesopore volumes or PSD curves of a few marine shales after solvent extraction have been reported [27,32,38].…”

Section: The Effects On the Mudstonesmentioning

confidence: 97%

“…Synchrotron-based scanning transmission X-ray microscopy (STXM) combined with X-ray absorption near edge structure (XANES) spectra provides spatially-resolved geochemical information of bitumen and nanoporous pyrobitumen as a response to the thermal evolution of kerogen [28]. Residual bitumen infilling causes the absence of original organic pores, which has been verified by imaging unextracted and extracted mudstones [29,30].…”

Section: Introductionmentioning

confidence: 99%

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The effects of solvent extraction on nanoporosity of marine-continental coal and mudstone

Cai

et al. 2019

Fuel

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Section: The Effects On the Mudstonesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

The effects of solvent extraction on nanoporosity of marine-continental coal and mudstone

Cai

et al. 2019

Fuel

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“…Nanometer-to micrometer-sized structures vary due to tectonic deformation and systematically across thermal maturity in organic-rich rocks, but a comprehensive dual study of the effect of tectonism and organic maturity on pore structures and processes in organic-rich shales is lacking. OM-hosted pores are mainly nanometer-to micrometer-sized, and are widely developed in gas shales, such as the Longmaxi Shale, the Yanchang Shale, the Barnett Shale, and the Marcellus Shale [19,20,36,37,[47][48][49][50][51]. Recent studies of the Barnett Shale in North America that use SEM imaging suggest that the porosity within OM particles can be higher than 40% of total porosity [22][23][24].…”

Section: Influence Of Combined Thermal Evolution and Tectonic Deformamentioning

confidence: 99%

Tectonic and Thermal Controls on the Nano-Micro Structural Characteristic in a Cambrian Organic-Rich Shale

Zhu

Huang

et al. 2019

Minerals

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Until recently, the characteristics of nano-microscale structures in the naturally deformed, overmature, marine shales were poorly known. Thermally overmature Lujiaping shales in the complex tectonic area of the northeast part of the upper Yangtze area, China have experienced strong tectonic deformation and are considered as potentially important strata for shale gas exploration. Naturally deformed samples from the main source rocks are selected from the Lower Cambrian Lujiaping Formation in the Dabashan Thrust-fold Belt to investigate nanometer- to micrometer-sized structures. A combination of scanning electron microscope (SEM), low-pressure nitrogen adsorption (LPNA), and low-field nuclear magnetic resonance (NMR) suggests that the pore types are dominantly fracture-related pores with a lesser abundance of mineral-hosted pores. These two pore types account for the 90% of total pore space. Organic matter (OM)-hosted pores are rare and make up a small part of the pore systems (less than 10%) due to high thermal maturity and intensive tectonic compression. Overall, the Lujiaping deformed, overmature samples have abundant nanometer- to micrometer-sized inorganic pores. High-resolution SEM images provide direct evidence of the formation of nano- and microsized structures such as OM–clay aggregates and silica nanograins. OM–clay aggregates are commonly observed in samples, which also exhibit abundant open microfractures and interparticle pores. Quartz can occur as silica nanograins and botryoids typically 20–100 nm in size, which may influence porosity through the creation or occupying interparticle pore space.

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“…The Chang 6 member above, and the Chang 8, 9 members blow it are the main reservoirs in the Yanchang Formation, which generally presenting low porosity and permeability (e.g. Lan et al., 2014; Li et al., 2016; Zhou et al., 2016; Zhu et al., 2015). The reservoir qualities have been addressed by many researchers and concluded that it’s dominated by compaction and cementation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fluid inclusions in buried quartz of the Yanchang sandstone in the Jiyuan area, Ordos Basin, China: Implications for basin evolution and petroleum accumulation

Jiang

Zhang

Jiang

2020

Energy Exploration & Exploitation

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A fluid inclusion petrographic and microthermometric study was performed on the sandstones gathered from the Yanchang Formation, Jiyuan area of the Ordos Basin. Four types of fluid inclusions in quartz can be recognized based on the location they entrapped. The petrographic characteristics indicate that fluid inclusions in quartz overgrowth and quartz fissuring-I were trapped earlier than that in quartz fissuring-IIa and fissuring-IIb. The homogenization temperature values of the earlier fluid inclusions aggregate around 80 to 90°C; exclusively, it is slightly higher in Chang 6 member, which approaches 95°C. The later fluid inclusions demonstrate high homogenization temperatures, which range from 100 to 115°C, and the temperatures are slightly higher in Chang 9 member. The calculated salinities show differences between each member, including their regression characteristics with burial depth. Combining with the vitrinite reflection data, the sequence and parameters of fluid inclusions indicate that the thermal history of the Yanchang formation mostly relied on burial. Salinity changes were associated with fluid-rock interaction or fluid interruption. Hydrocarbon contained fluid inclusions imply that hydrocarbon generation and migration occurred in the Early Cretaceous. The occurrence of late fluid inclusions implied that quartz cement is a reservoir porosity-loose factor.

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Effect of organic matter on pore structure of mature lacustrine organic-rich shale: A case study of the Triassic Yanchang shale, Ordos Basin, China

Cited by 106 publications

References 28 publications

The effects of solvent extraction on nanoporosity of marine-continental coal and mudstone

The effects of solvent extraction on nanoporosity of marine-continental coal and mudstone

Tectonic and Thermal Controls on the Nano-Micro Structural Characteristic in a Cambrian Organic-Rich Shale

Fluid inclusions in buried quartz of the Yanchang sandstone in the Jiyuan area, Ordos Basin, China: Implications for basin evolution and petroleum accumulation

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