The Biomarkers in the Mesoproterozoic Organic‐rich Rocks of North China Craton: Implication for the Precursor and Preservation of Organism in the Prokaryotic Realm

Ma, Sai; Zhang, Shuichang; Jin, Sheng; Wang, Xiaomei; He, Kun; Fang, Yu; Mi, Jingkui

doi:10.1111/1755-6724.14773

Cited by 5 publications

(1 citation statement)

References 75 publications

(98 reference statements)

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“…Biomarker compound parameters are another tool for evaluating the maturity of organic matter in sedimental rocks [51,54,55]. During the heating of hopanes and steranes under geological conditions, the R conformation is converted to the S conformation, forming a mixed conformation of R + S. In general, a higher 22S/(S + R) ratio represents higher maturity [52].…”

Section: Organic Matter Maturitymentioning

confidence: 99%

Lipid Biomarker and Stable Isotopic Profiles through Late Carboniferous–Early Triassic of the Deepest Well MS-1 in the Junggar Basin, Northwest China

et al. 2022

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The Carboniferous–Triassic period was an important stage of global sea–land transformation, with coal formation in the Carboniferous, biological extinction at the end of the Permian, and global drought in the Triassic. The MS-1 well in the Mosuowan High of the Junggar Basin is the deepest well drilled in Northwestern China. In this paper, we investigate the sedimentary environment and climate evolution of the Mosuowan area in the central Junggar Basin during the Late Carboniferous–Early Permian by the petrothermal, lipid biomarker, and isotopic composition of mud shale core samples, and explore the tectonic–climatic events and Central Asian orogenic belt evolution driving the sedimentary environment. The study shows that the organic matter from the Upper Carboniferous to the Lower Permian is at a mature stage, but biomarkers maintained the primary information although the organic matter was subjected to thermal evolution. In the late Carboniferous period (Tamugan Formation), the study area was a closed remnant sea with a relatively humid climate, triggering lush terrestrial vegetation and high organic carbon content in the sediments, which had the potential to evolve into natural gas. During the Xiazijie Formation of the Middle Permian, tectonic activity shifted to the subsidence period, and the salinity of the water decreased after a large input of fresh water. The lake basin area expanded, and the content of aquatic organisms continued to increase. As the Lower Permian stratigraphy is missing, this sea–land transition seems to jump. The low and upper Urho Formations of the Middle–Upper Permian are a deltaic foreland deposit, and geochemical indicators show an overall lake retreat process with a continuous increase in organic matter content of terrestrial origin. The lithologic assemblage of the Triassic Baikouquan Formation is braided river deltaic sedimentation with migration of deposition centers of the lake basin. In conclusion, the Late Carboniferous–Early Permian period was influenced by global changes, Paleo-Asian Ocean subduction, and continental splicing, which resulted in a continuous increase in terrestrial organic matter, water desalination, and oxidation-rich sediments in the Mosuowan region, but the P–T biological mass extinction event was not recorded.

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Section: Organic Matter Maturitymentioning

confidence: 99%

Lipid Biomarker and Stable Isotopic Profiles through Late Carboniferous–Early Triassic of the Deepest Well MS-1 in the Junggar Basin, Northwest China

et al. 2022

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Origin and preservation mechanisms of organic matter in carbonate concretions from Lower Cambrian black shales in South China

Fang,

Zhang,

et al. 2024

Organic Geochemistry

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The Potential of the Oldest Shale Oil in China: Mesoproterozoic Hongshuizhuang and Xiamaling Shales in the Yanshan Basin

Tao,

Zhang,

Dang

et al. 2024

Energy Fuels

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Shale oil exploration and development have made significant breakthroughs in Paleozoic marine shales and Mesozoic−Cenozoic lacustrine shales. However, the shale oil potential of older Precambrian sediments remains poorly constrained. Our two newly drilled boreholes reveal shale oil shows in the Mesoproterozoic Hongshuizhuang and Xiamaling shales in the Yanshan Basin, China. In order to further evaluate the shale oil potential, multiple experimental methods were employed, including TOC and thermal maturity analyses, routine and step-by-step Rock-Eval pyrolyses, Xray diffraction, field emission scanning electron microscopy, lowtemperature nitrogen adsorption, and hydrocarbon vapor adsorption. The results show that Hongshuizhuang shale, which is characterized by type II kerogen and low-medium maturity of R 0 = 0.65−0.92%, is a set of good source rocks, while the source rock quality of Xiamaling shale is highly variable. Moreover, the hydrocarbon generation potential of prokaryote-dominated Mesoproterozoic source rocks is comparable to that of eukaryote-dominated Phanerozoic source rocks, implying a favorable factor for shale oil accumulation in Precambrian formations. The main storage space for shale oil in both formations is provided by inorganic pores, in which the adsorbed oil is predominantly retained in micropores to fine mesopores (<15 nm) and free oil mainly stored in mesopores to macropores. Adsorbed oil exists as a multilayer oil film, with its average thickness increasing as a Langmuir adsorption curve with pore size. The evaporative hydrocarbon content of the Hongshuizhuang Formation ranges from 2.53 to 12.53 mg/g and is dominated by adsorbed hydrocarbons (mean 6.01 ± 2.10 mg/g), while the evaporative hydrocarbon content of Xiamaling Formation is much lower, with an average value of 2.4 ± 2.4 mg/g. TOC content, mineral composition, thermal maturity, pore volume and surface area are important factors affecting the degree of shale oil enrichment. The compilation and comparison show that the Hongshuizhuang Formation is a promising target for the oldest shale oil exploration. Furthermore, the results suggest that the combination of step-by-step pyrolysis and hydrocarbon vapor adsorption is a practical method for estimating both free and adsorbed hydrocarbon contents and revealing their storage space within shale nanopores.

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The Biomarkers in the Mesoproterozoic Organic‐rich Rocks of North China Craton: Implication for the Precursor and Preservation of Organism in the Prokaryotic Realm

Cited by 5 publications

References 75 publications

Lipid Biomarker and Stable Isotopic Profiles through Late Carboniferous–Early Triassic of the Deepest Well MS-1 in the Junggar Basin, Northwest China

Lipid Biomarker and Stable Isotopic Profiles through Late Carboniferous–Early Triassic of the Deepest Well MS-1 in the Junggar Basin, Northwest China

Origin and preservation mechanisms of organic matter in carbonate concretions from Lower Cambrian black shales in South China

The Potential of the Oldest Shale Oil in China: Mesoproterozoic Hongshuizhuang and Xiamaling Shales in the Yanshan Basin

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