Oil Charge History of Bitumens of Differing Maturities in Exhumed Palaeozoic Reservoir Rocks at Tianjingshan, Nw Sichuan Basin, Southern China

Zhou, Qing; Xiao, Xia; Tian, Hui; Wilkins, R. J.

doi:10.1111/jpg.12561

Cited by 18 publications

(16 citation statements)

References 43 publications

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“…Their locations were present in the Refs. [23][24][25]. A coal sample with a similar initial maturity (VRo = 0.56%) was also pyrolyzed under the same conditions as the three shales to give a measure of the thermal maturity of the shale samples at different pyrolysis temperatures.…”

Section: Samplesmentioning

confidence: 99%

Evolution of nanoporosity in organic-rich shales during thermal maturation

Chen

Xiao

2014

Fuel

340

186

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Section: Samplesmentioning

confidence: 99%

Evolution of nanoporosity in organic-rich shales during thermal maturation

Chen

Xiao

2014

Fuel

340

186

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“…(a) Location of outcrops and well sites in this study (modified from Wang et al, ); (b) the stratigraphy of Sichuan Basin (modified from Liang et al, ; Zhou et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Backgroundmentioning

confidence: 99%

Source analysis of quartz from the Upper Ordovician and Lower Silurian black shale and its effects on shale gas reservoir in the southern Sichuan Basin and its periphery, China

Han

Jiang

et al. 2018

Geological Journal

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A major breakthrough in shale gas exploration and development has been made concerning the black shale of the Upper Ordovician and Lower Silurian. In recent years, significant progresses have been made regarding the exploration and development of shale gas in the black shale of the Upper Ordovician and Lower Silurian. Accordingly, we investigated the petrological and geochemical characteristics of the black shale from WF2‐LM5 graptolite biozones and performed a source analysis of quartz as well as evaluated its effect on shale gas reservoirs. The black shale mainly contains clay, carbonate, and quartz with the average TOC of 2.21%. Three quartz types, Q1, Q2, and Q3, were identified via petrological and cathodoluminescence (CL) analysis. Q1 of detrital origin as suggested by its typical morphology with monocrystal structure, large grain‐size, subrounded to angular outlines, and clear edges. This is further supported by the occurrence of medium luminescence under cathodoluminescence and medium intensity of P1 and P2 and high intensity P3 according to CL images. Q2 accounts for more than 90% of quartz and exhibits cryptocrystalline texture, an irregular shape, blurring edges, and low luminescence, and its CL images show low intensity P1, low intensity P2, and high intensity P3. Q3 have the morphologies of siliceous organisms, for example, sponge spicules, radiolaria, and foraminifera. Q2 and Q3 belong to authigenic quartz derived from siliceous organisms. Th/U and V/Cr indicate black shale from LM1–3 mainly deposited in the dysoxic‐anoxic environment while black shale from LM4–5 deposited in the oxic environment. Authigenic quartz‐rich shales from LM1–3 were speculated to be the best shale gas reservoirs characterized by high TOC content, high gas content, and with negligible amount of detrital quartz. Compared with shale from LM1–3, black shale from LM4–5 usually have relatively high detrital quartz content and low TOC content and gas content. Considering the abundant interparticle pore space, the detrital quartz‐rich shale interbedded within the black shale from LM4–5, could also become good shale gas reservoirs if sufficient gas supply is guaranteed.

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“…The initial tectonic events were associated with the Palaeozoic Caledonian Orogeny caused by the closure of the Tethys ocean, with thrusting causing numerous unconformities between the Early Palaeozoic strata (Jin et al, 2010). Following the Caledonian Orogeny (Early Devonian), the Longmen Shan belt changed into a passive continental margin throughout the Devonian and Permian that was associated with extensional tectonism (Jia et al, 2006;Li et al, 2012;Tian, 2009;Zhou et al, 2013).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Early-Mid Triassic strata include ~750 m of limestones interbedded with sandstones or shales. The Late Triassic units of ~400 m thickness comprise interbedded sandstones and mudstones (Zhou et al, 2013). The overlying Jurassic and Cretaceous fluviolacustrine sediments comprise mudstones, sandstones and siltstones with a total thickness of up to 4500 m (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Upper Neoproterozoic to Lower Cambrian shales and middle Permian black mudstones are considered as the potential source rocks (Xie et al, 2003;Zhou et al, 2013) to several petroleum systems (e.g., Ningqiang, Tanjingshan and Kuangshanliang) in the northern Longmen Shan Thrust Belt (Chen et al, 1994;Huang and Wang, 2008;Tissot and Welte, 1984 (Chen and Wilson, 1996;Li et al, 1999;Worley and Wilson, 1996;Zhou et al, 2013). Devonian marine mudstones, Triassic gypsum, and Jurassic to Cretaceous mudstones act as seals to the several petroleum systems (Zhou et al, 2013) ( Fig. 2).…”

Section: Geological Settingmentioning

confidence: 99%

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Petroleum-generation timing and source in the northern Longmen Shan thrust belt, Southwest China: Implications for multiple oil-generation episodes and sources

Gao¹,

Shen²,

Selby³

et al. 2018

Bulletin

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The temporal evolution of hydrocarbons (~500 million barrels oil) and its relationship to the orogenic events of the Longmen Shan Thrust Belt have been extensively debated. The hydrocarbons occur as solid bitumen, as dykes and/or coatings within/along faults/fractures, and as present day oil seeps. Here utilizing organic geochemistry, we demonstrate that all the bitumen exhibit similar organo-gechemical characteristics, and were sourced from the Late Neoproterozoic-Early Cambrian Doushantuo and Qiongzhusi formations. In contrast, the organic geochemistry of the present day oil seeps are distinct from that of the bitumen, and suggest that the source is the Permain This is a revised version with the manuscript Number BLTN16-230 Petroleum generation timing and source in the Northern Longmen Shan Thrust Belt, Southwest China: Implications for multiple oil generation episodes and sources

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Oil Charge History of Bitumens of Differing Maturities in Exhumed Palaeozoic Reservoir Rocks at Tianjingshan, Nw Sichuan Basin, Southern China

Abstract: Low-maturity soft bitumen (or biodegraded heavy oil) and higher maturity solid bitumen are present in Palaeozoic siliciclastics at Tianjingshan in the NW

Cited by 18 publications

References 43 publications

Evolution of nanoporosity in organic-rich shales during thermal maturation

Evolution of nanoporosity in organic-rich shales during thermal maturation

Source analysis of quartz from the Upper Ordovician and Lower Silurian black shale and its effects on shale gas reservoir in the southern Sichuan Basin and its periphery, China

Petroleum-generation timing and source in the northern Longmen Shan thrust belt, Southwest China: Implications for multiple oil-generation episodes and sources

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