Potential Oil and Gas-Bearing Basins of the Qinghai-Tibetan Plateau, China

Wang, Chengshan; Chang, Edmund Z.; Zhang, Shaonan

doi:10.1080/00206819709465307

Cited by 20 publications

(14 citation statements)

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“…S1-S5 in the Supplement and Table 2. The hydrocarbon formation and accumulation in the Junggar Basin are mainly controlled by the Permian petroleum system (Wang et al, 2001). Previous geochemical and sedimentological data demonstrate that the source rocks are mainly Permian shales and that the main reservoirs are the clastic rocks in the Permian, the Triassic, and the Jurassic formations capped by the Upper Triassic, the Lower Jurassic, and the Lower Cretaceous mudstones, respectively (Cao et al, 2005).…”

Section: Asdls In the Six Representative Basinsmentioning

confidence: 99%

“…Global, 2017). Because of their indispensable role in the world economy, some research has been done on fossil fuels in the past few decades, including characterizing and explaining their spatial distribution in various types of sedimentary basins (Tissot and Welte, 1978;Wang et al, 1997;Gautier et al, 2009) and their temporal distribution over the past 1.6 billion years of geological history (Wang et al, 2016). However, the vertical distribution of fossil fuel resources, especially the maximum preservation depth, remains ambiguous because of different understandings of the fossil fuel resource origins and the great variations in the depths from basin to basin (Kennedy et al, 2002;Peters et al, 2005;Pang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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The dead line for oil and gas and implication for fossil resource prediction

Pang

Jia

Zhang

et al. 2020

Earth Syst. Sci. Data

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Abstract. Fossil fuel resources are invaluable to economic growth and social development. Understanding the formation and distribution of fossil fuel resources is critical for the search and exploration of them. Until now, the vertical distribution depth of fossil fuel resources has not been confirmed due to different understandings of their origins and the substantial variation in reservoir depths from basin to basin. Geological and geochemical data of 13 634 source rock samples from 1286 exploration wells in six representative petroliferous basins were examined to identify the maximum burial depth of active source rocks in each basin, which is referred to in this study as the active source rock depth limit (ASDL). Beyond the ASDL, source rocks no longer generate or expel hydrocarbons and become inactive. Therefore, the ASDL also sets the maximum depth for fossil fuel resources. The ASDLs of basins around the world are found to range from 3000 to 16 000 m, while the thermal maturities (Ro) of source rocks at the ASDLs are almost the same, with Ro ≈3.5±0.5 %. The Ro of 3.5 % can be regarded as a general criterion to identify ASDLs. High heat flow and more oil-prone kerogen are associated with shallow ASDLs. In addition, tectonic uplift of source rocks can significantly affect ASDLs; 21.6 billion tons of reserves in six representative basins in China and 52 926 documented oil and gas reservoirs in 1186 basins around the world are all located above ASDLs, demonstrating the universal presence of ASDLs in petroliferous basins and their control on the vertical distribution of fossil fuel resources. The data used in this study are deposited in the repository of the PANGAEA database at: https://doi.org/10.1594/PANGAEA.900865 (Pang et al., 2019).

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Section: Asdls In the Six Representative Basinsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The dead line for oil and gas and implication for fossil resource prediction

Pang

Jia

Zhang

et al. 2020

Earth Syst. Sci. Data

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“…The Qiangtang Basin is the biggest marine basin in the Tibetan Plateau of the eastern Tethys, covering an area of about 220 × 10 3 km 2 (Wang et al ., ). Over the past two decades, the basin has become a frontier for oil exploration (Zhao and Li, ; C. S. Wang et al ., 2004; Chen et al ., , ; Guo et al ., ; Wang et al ., , ; Ding et al ., , ; Zeng et al ., ). The early Jurassic black shales are the most important source rocks in the basin (Wang et al ., ).…”

Section: Introductionmentioning

confidence: 99%

“…Over the past two decades, the basin has become a frontier for oil exploration (Zhao and Li, 2000;C. S. Wang et al, 2004;Chen et al, 2008Chen et al, , 2014Guo et al, 2008;Wang et al, 2009Wang et al, , 2010Ding et al, 2011Ding et al, , 2013Zeng et al, 2013). The early Jurassic black shales are the most important source rocks in the basin (Wang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

Wang

Chen

et al. 2015

Geological Journal

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The early Jurassic black shales are the most important source rocks in the Qiangtang Basin, Tibet. These black shales may provide a useful example for understanding the sedimentary conditions during the early Jurassic in the eastern Tethys. Thirty-two black-shale samples were collected from the Qiangtang Basin to reconstruct the depositional environments during the early Jurassic in the eastern Tethys. The palaeoclimate index Σ(Fe + Mn + Cr + Ni + V + Co)/Σ(Ca + Mg + Sr + Ba + K + Na) varies between 0.58 and 1.14, together with low Sr/Ba (0.20-0.60) and Sr/Cu (1.68-7.88) ratios, indicating a warm humid to semi-humid climatic condition during black-shale deposition. The early Jurassic black shales exhibit slight Ce anomalies (0.89-0.94) and Mn enrichment (EF = 1.2), suggesting a slightly oxic depositional environment. The conditions of the sedimentary water system during black-shale deposition were apparently brackish as evidenced by middle B/Ga (3.96-5.73) and Th/U (3.96-6.51) ratios.

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“…Other basins have been received little consideration and only a few papers in international journals have considered their petroleum geology and exploration potential (e.g. Taner and Meyerhoff, 1990a, b;Wang et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Organic Geochemistry of Potential Source Rocks in the Tertiary Dingqinghu Formation, Nima Basin, Central Tibet

Wang

et al. 2010

Journal of Petroleum Geology

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The Tertiary Nima Basin in central Tibet covers an area of some 3000 km2 and is closely similar to the nearby Lunpola Basin from which commercial volumes of oil have been produced. In this paper, we report on the source rock potential of the Oligocene Dingqinghu Formation from measured outcrop sections on the southern and northern margins of the Nima Basin. In the south of the Nima Basin, potential source rocks in the Dingqinghu Formation comprise dark‐coloured marls with total organic carbon (TOC) contents of up to 4.3 wt % and Hydrogen Index values (HI) up to 849 mg HC/g TOC. The organic matter is mainly composed of amorphous sapropelinite corresponding to Type I kerogen. Rock‐Eval Tmax (430–451°C) and vitrinite reflectance (Rr) (average Rr= 0.50%) show that the organic matter is marginally mature. The potential yield (up to 36.95 mg HC/g rock) and a plot of S2 versus TOC suggest that the marls have moderate to good source rock potential. They are interpreted to have been deposited in a stratified palaeolake with occasionally anoxic and hypersaline conditions, and the source of the organic matter was dominated by algae as indicated by biomarker analyses. Potential source rocks from the north of the basin comprise dark shales and marls with a TOC content averaging 9.7 wt % and HI values up to 389 mg HC/g TOC. Organic matter consists mainly of amorphous sapropelinite and vitrinite with minor sporinite, corresponding to Type II‐III kerogen. This is consistent with the kerogen type suggested by cross‐plots of HI versus Tmax and H/C versus O/C. The Tmax and Rr results indicate that the samples are immature to marginally mature. These source rocks, interpreted to have been deposited under oxic conditions with a dominant input of terrigenous organic matter, have moderate petroleum potential. The Dingqinghu Formation in the Nima Basin therefore has some promise in terms of future exploration potential.

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Potential Oil and Gas-Bearing Basins of the Qinghai-Tibetan Plateau, China

Cited by 20 publications

References 4 publications

The dead line for oil and gas and implication for fossil resource prediction

The dead line for oil and gas and implication for fossil resource prediction

Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

Organic Geochemistry of Potential Source Rocks in the Tertiary Dingqinghu Formation, Nima Basin, Central Tibet

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