Geochemical Characteristics of Oil from Oligocene Lower Ganchaigou Formation Oil Sand in Northern Qaidam Basin, China

Liang, Yue; Shan, Xuanlong; Makeen, Yousif M.; Abdullah, Wan Hasiah; Hao, Guoli; Lihua, Tong; Lawal, Mutari; Zhao, Ruiming; Ayinla, Habeeb A.

doi:10.1007/s11053-019-09466-9

Cited by 1 publication

(3 citation statements)

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“…Figure 8. Ternary plot of relative proportions of C 27 , C 28 , and C 29 steranes for the Qingshankouzu Formation, indicating the relationships between these sterane compositions [42,43]. Previous studies have shown that a large amount of gammacerane usually occurs in organic matter deposits in high-salinity environments, and the presence of gammacerane can also indicate high-salinity environments [53].…”

Section: Molecular Composition Of Hydrocarbonsmentioning

confidence: 95%

“…C 28 sterols are often regarded as biomarkers of diatom, green algae and higher plants. [43], whereas C 27 steroids representing marine sediments are typical zooplankton and red algae and C 29 steroids are found in higher plants and some brown algae or green algae. [52] According to the ratios of the relative contents of the C 27 , C 28 and C 29 steroids, it can be concluded that the oil shales are dominated by zooplankton, algae and higher plants.…”

Section: Molecular Composition Of Hydrocarbonsmentioning

confidence: 99%

Section: Molecular Composition Of Hydrocarbonsmentioning

confidence: 99%

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Organic Geochemical Characteristics of the Upper Cretaceous Qingshankou Formation Oil Shales in the Fuyu Oilfield, Songliao Basin, China: Implications for Oil-Generation Potential and Depositional Environment

Sun

Guo

et al. 2019

Energies

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The Cretaceous Era has always been a focus of geologic and palaeoenvironmental studies. Previous researchers believed that the impact of the global carbon cycle represents significant short-term global biogeochemical fluctuations, leading to the formation of a large number of organic rich sediments in the marine environment. During the Turonian, a large number of organic-rich oil shales were deposited in the lakes of the Songliao Basin in the Qingshankou Formation. How the depositional environment affected the formation of oil shales in continental lakes and the characteristics of these oil shales remain controversial. In this paper, through sampling of Qingshankou Formation strata, various testing methods are used to provide a variety of new data to study the characteristics of oil shales and palaeoenvironment evolution history in the Songliao Basin. The research of the sediments in the Qingshankou Formation in the Fuyu oilfield, Songliao Basin, via result analysis revealed that the oil shales possess an excellent oil-generation potential with moderate-high total organic carbon (TOC) levels (0.58–9.43%), high hydrogen index (HI) values (265–959 mg hydrocarbons (HC)/g TOC), high extractable organic matter (EOM) levels (2.50–6.96 mg/g TOC) and high hydrocarbon fractions (48–89%). The sources of the organic matter were mainly zooplankton, red algae and higher plants (including marine organisms). The aqueous palaeoenvironment of the Qingshankou Formation was a saline water environment with a high sulfate concentration, which promoted an increase in nutrients and stratification of the water density in the lake basin. Oxygen consumption in the bottom water layer promoted the accumulation and burial of high-abundance organic matter, thus forming the high-quality oil shales in the Qingshankou Formation. The global carbon cycle, warm-humid palaeoclimate, dynamic local biogeochemical cycling and relative passive tectonism were the most likely reasons for the TOC increase and negative δ13Corg deviation.

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Section: Molecular Composition Of Hydrocarbonsmentioning

confidence: 95%

Section: Molecular Composition Of Hydrocarbonsmentioning

confidence: 99%