Depositional environment of oil shale within the second member of Permian Lucaogou Formation in the Santanghu Basin, Northwest China

Liu, Bo; Bechtel, Achim; Sachsenhofer, Reinhard F.; Groß, Doris; Gratzer, Reinhard; Chen, Xuan

doi:10.1016/j.coal.2017.03.011

Cited by 145 publications

(79 citation statements)

References 64 publications

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“…10), and the high C 28 /C 27 regular sterane ratios of some samples indicate diatoms and dinoflagellates mainly contribute to the C 28 sterane. This is consistent with the interpretation on high content of C 28 steranes from the tuffaceous mudstone of the Permian source rocks in the Junggar Basin (Liu et al 2017).…”

Section: Thermal Maturity and Organic Matter Sourcesupporting

confidence: 92%

Paleoenvironment and organic matter enrichment of the Carboniferous volcanic-related source rocks in the Malang Sag, Santanghu Basin, NW China

Huang

Chen

et al. 2020

Pet. Sci.

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Volcanic activity was quite frequent during the deposition of the Late Carboniferous Ha’erjiawu Formation in the Santanghu Basin. The petrology and organic and inorganic geochemical indicators were used to investigate hydrocarbon potential, paleoenvironmental conditions and organic matter enrichment of the mudstones. The results show that the oil generation capacity of the Ha’erjiawu Formation mudstones, which has abundant oil-prone organic matter (Type II kerogen with hydrogen index values mainly ranging from 250 to 550 mg HC/g TOC) in mature stage (Tmax values mainly ranging from 435 to 450 °C), is considerable. The Ha’erjiawu Formation was deposited in a dysoxic, freshwater-mildly brackish, and warm-humid environment. During its deposition, the Ha’erjiawu Formation received hydrothermal inputs. The volcanic hydrothermal activities played an important role in the organic matter enrichment. In addition, the total organic carbon (TOC) is significantly positively correlated with the felsic mineral content, but it is negatively correlated with the carbonate mineral content and C27/C29 ratios, indicating that terrigenous organic matter input also contributed to the primary productivity in the surface water. Therefore, the formation of the high-quality source rocks in the Ha’erjiawu Formation was jointly affected by the hydrothermal activity and the terrigenous organic matter input.

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Section: Thermal Maturity and Organic Matter Sourcesupporting

confidence: 92%

Paleoenvironment and organic matter enrichment of the Carboniferous volcanic-related source rocks in the Malang Sag, Santanghu Basin, NW China

Huang

Chen

et al. 2020

Pet. Sci.

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“…PLOT 30 m × 0.32 mm) attached to a Finnigan Mat Delta S mass spectrometer. The GC oven temperature increased from 35°C to 80°C at a rate of 8°C∕ min and then to 260°C at 5°C∕ min, and it remained constant for 10 min to the end (Liu et al, 2017). Samples were analyzed twice, and the averaged values were used for the analyses.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…The oven temperature gradient was programmed to increase from 70°C to 300°C at 4°C∕ min, followed by an isothermal period of 15 min. Helium was used as the carrier gas, and the sample was injected splitless, with the injector temperature at 275°C (Liu et al, 2017). The spectrometer was operated in the electron ionization mode over a scan range from m∕z (mass charge ratio) 50 to m∕z 650, and the total scan lasted for 0.7 s.…”

Section: Samples and Methodsmentioning

confidence: 99%

Investigation of geochemical characteristics of hydrocarbon gas and its implications for Late Miocene transpressional strength — A study in the Fangzheng Basin, Northeast China

Liu

Yan

et al. 2018

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We have assessed the genetic types of hydrocarbon gas in the Fangzheng Basin by analyzing the effects of geologic settings on gas generation, kerogen types in source rocks, gas compositions, stable carbon isotopes of individual alkanes, and biomarkers in gas-associated oil. The primary compounds of source rocks in the Eocene Xinancun Formation and Paleocene Wuyun Formation are found as type II and III kerogens, respectively. The hydrocarbon gas in the Fangzheng Basin can be classified into three families. Family I is affected by biodegradation, and it is dry gas generated from low-maturity lacustrine mudstones (i.e., oil-prone source rocks) of the Xinancun Formation. Family II is coal-derived wet gas accompanied by oil, and it is typically generated by type III kerogen of mudstones in coal measures of the Wuyun Formation. Family III is mixed-type wet gas whose primary compound is oil-associated gas, and it is mainly generated by type II kerogen in the Xinancun Formation and partly from type III kerogen in the Wuyun Formation in the Daluomi (DLM) Uplift. The family I and II hydrocarbon gases are located in the Zhuozhugang (ZSG) Sag. Family III hydrocarbon gas was formed in the mixing process of different genesis gas through the active faults because the late Miocene transpressional strength of uplift in the DLM Uplift was more intense than that in the ZSG Sag after the development of increased accommodation space coeval with intrabasinal rifting before Oligocene.

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“…The lithological successions of the middle Permian Jiangjunmiao and Lucaogou/Pingdiquan formations are characterized by thick black and dark gray organic-rich shales/ mudstones and sandstones interbedded with relatively thin layers of tuffs and microcrystalline limestones and dolomites, indicating a terrestrial semi-deep to deep lacustrine environment with huge hydrocarbon source potential (Li 2004;Jiang et al 2015). In particular, the thick black shales/mudstones of the Lucaogou Formation, with high total organic carbon (TOC) and abundant organic matter, are considered as a "world class source rock" and potential tight oil reservoirs in both the Junggar and Santanghu basins in northern Xinjiang (Carroll 1998;Liu et al 2017Liu et al , 2018Zou et al 2019). For example, in the Shishugou Sag, the Lucaogou Formation in Well Sh2 is composed of 480 m of gray fine-grained sandstones, argillaceous sandstones, calcareous sandstones, siltstones, and tuffaceous siltstones interbedded with dark gray mudstones, silty mudstones, tuffaceous mudstones, and dolomitic mudstones ( Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…However, no other confirmed evaporative evidence has been found in these areas, such as desiccation cracks or red clays. Instead, the surrounding thick dark gray mudstones, black shales, and organic geochemistry indicate a relatively deep lake environment as the sedimentation center in the Jimusar Sag (Carroll 1998;Liu et al 2017Liu et al , 2018Gao et al 2020). A detailed paleoclimate reconstruction in the southern Bogda area by Yang et al (Yang et al 2007a;Yang et al 2010) indicates oscillating climatic conditions in the Lucaogou period from subhumid to semiarid and even semiarid to arid.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal mineral assemblages of calcite and dolomite–analcime–pyrite in Permian lacustrine Lucaogou mudstones, eastern Junggar Basin, Northwest China

et al. 2020

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The eastern Junggar Basin, controlled by continental extension (rift), was deposited by lacustrine dominated sediments during middle Permian Lucaogou period. An unusual porphyritic-like texture was observed in Lucaogou/Pingdiquan dark fine-grained organic-rich sediments in two sub-tectonic units in the basin. The “phenocrysts” are composed of two types of mineral assemblages. The first is a coarse euhedral calcite assemblage in the Jimusar Sag, and the second consists of dolomite, analcime, and pyrite in the Shishugou Sag. The lithological and mineralogical features indicate a hydrothermal origin for these phenocryst-like minerals. The chondrite-normalized rare earth element patterns show flat or positive Ce anomalies and negative Eu anomalies, which reflect a suboxic to anoxic, off-axis site from the center of the fault system, where the temperature of the hydrothermal fluid might be less than 250 °C. The high ratios of BaN/LaN at 1.6–65.5, strongly positive Sr anomalies at Sr/Sr* = 5.54–39.9, and relatively low 87Sr/86Sr isotopes at 0.705002–0.705776 in the coarse calcite suggest an origin of mixed sources of lake water, underlying biogenetic sediments, and deep magmatic water. However, the low 87Sr/ 86Sr ratios of 0.705321–0.705968 in the dolomite and δ34SV-CDT of 10.8‰–12.3‰ in the pyrite indicate that water–underlying-rock interaction and the abiotic thermochemical sulfate reduction of lake water or organic matter might have participated together resulting in the precipitation of the dolomite–analcime–pyrite assemblages in the Shishugou Sag.

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Depositional environment of oil shale within the second member of Permian Lucaogou Formation in the Santanghu Basin, Northwest China

Cited by 145 publications

References 64 publications

Paleoenvironment and organic matter enrichment of the Carboniferous volcanic-related source rocks in the Malang Sag, Santanghu Basin, NW China

Paleoenvironment and organic matter enrichment of the Carboniferous volcanic-related source rocks in the Malang Sag, Santanghu Basin, NW China

Investigation of geochemical characteristics of hydrocarbon gas and its implications for Late Miocene transpressional strength — A study in the Fangzheng Basin, Northeast China

Hydrothermal mineral assemblages of calcite and dolomite–analcime–pyrite in Permian lacustrine Lucaogou mudstones, eastern Junggar Basin, Northwest China

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