Thermal evolution and applications of aromatic hydrocarbons in highly mature coal-bearing source rocks of the Upper Triassic Xujiahe Formation in the northern Sichuan Basin

Li, Ying; Zhu, Y.; Hao, Fang; Zou, Huayao; Guo, Tonglou

doi:10.1007/s11430-015-5084-8

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…The marine source rocks are Late Sinian-Middle Triassic carbonate rocks which could be classified as five sets of source rocks, namely Z 2 d, ∈ 1 q, S 1 l, P 1 q and P 2 w in the (Xu et al., 2011). The continental source rocks are the Late Triassic clastic rocks, with six sets of source rocks, namely T 3 x 1 (first member of the Xujiahe Formation), T 3 x 2 (middle of the second member of the Xujiahe Formation), T 3 x 3 (third member of the Xujiahe Formation), T 3 x 5 (fifth member of the Xujiahe Formation) (Li et al., 2012), J 1 dn (Da’anzhai Formation) and J 1 l (Lianggaoshan Formation) in deposits (Figure 1) (Huang et al., 1996). According to the estimates by the company of PetroChina, 4286.35 × 10 12 m 3 gas and 3288.46 × 10 8 t oil have been generated from these source rocks, among which, 89.90% gas are generated from marine source rock, and all oil are generated from continental source rocks (Chen et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Biomarker distributions and depositional environments of continental source rocks in Sichuan Basin, SW China

Huang

et al. 2020

Energy Exploration & Exploitation

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In order to study the distributions of the biomarker of the continental source rocks in the Sichuan Basin, 71 source rock samples were collected from the Upper Triassic-Lower Jurassic strata in different regions. The n-alkanes, isoprenoids, terpane, sterane, sesquiterpenes, caranes and aromatics in the extracts were analyzed in detail. GC-MS analysis has been conducted to analyze the biomarker of the continental source rocks. The results of GC-MS analysis indicate that the Upper Triassic source rocks are high in the content of extended tricyclic terpanes, pristane, phytane, gammacerane, C28 regular sterane and carotene. However, they are low in content of rearranged compounds. The ratio of Pr/Ph is less than 1, with the characteristics of tricyclic terpane C21 > C23. The Lower Jurassic source rocks are extremely low in content (even zero) of extended tricyclic terpanes, pristane, phytane, gammacerane, C28 regular sterane and carotene, and high in content of rearranged compounds. The ratio of Pr/Ph is more than 1, with tricyclic terpane C21 > C23. These characteristics are still preserved after maturation. Moreover, during the sedimentation of the source rocks of T3x2–T3x3 members, the supply of continental plants was low (TAR < 1, with regular sterane C27 > C29, 1-MP/9-MP < 1). The source rocks of T3x5 member were low in salinity (slightly low content of gammacerane and carotene), being different significantly from the other Upper Triassic source rocks. In addition, during the sedimentation of the source rocks of J1dn Member, the supply of continental plants was also low (regular sterane C27 > C29, 1-MP/9-MP < 1), being quite different from that of J1l member. Through analysis of the difference in biomarkers, it is indicated that the sedimentary environment had changed from anoxic and brackish water during the Late Triassic to oxygen-rich and freshwater during the Early Jurassic in the Sichuan Basin. During this process, the types of organic matters had changed for several times.

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Section: Introductionmentioning

confidence: 99%

Biomarker distributions and depositional environments of continental source rocks in Sichuan Basin, SW China

Huang

et al. 2020

Energy Exploration & Exploitation

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“…In addition, the cross plot of C 27 20R-TAS/C 28 20R-TAS versus C 26 20S-TAS/C 28 20S-TAS can be used for oil family classification and oil-source correlation (Peters et al, 2005;Zhu et al, 2009). As shown in Figure 11, it can be seen that two types of crude oil were well divided and the organic matter type of Oil type II was better than Oil type I, probably showing a higher proportion of bacteria and algae input (Li et al, 2015).…”

Section: Triaromatic Steroidsmentioning

confidence: 96%

“…Triaromatic steroids (TAS) may originated by aromatization and demethylaiton from monoaromatic steroids. Since monoaromatic steroids could be derived from sterols through steranes during diagenesis, triaromatic steroids and steranes potentially share the same precursors (Peters et al, 2005;Li et al, 2012;Li et al, 2015). Triaromatic steroid series in the studied oil samples included triaromatic steroids (m/z 231) and methyl triaromatic steroids (m/z 245).…”

Section: Triaromatic Steroidsmentioning

confidence: 99%

Geochemical characteristics and significance of aromatic hydrocarbons in crude oil from the East Fukang Sag, Junggar Basin, NW China

Hou²,

Cheng³

et al. 2023

Front. Earth Sci.

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The aromatic compounds of twenty crude oil samples from different formations in the East Fukang Sag were studied by the gas chromatography–mass spectrometry technique. Through analysis of the composition of the main aromatic hydrocarbons, the studied crude oil samples were generally divided into two types: Oil type I had the relatively high content of the naphthalene series, biphenyl series and dibenzofuran series, while the samples from Oil type II contained relatively high abundance of phenanthrene series, fluorene series, triaromatic steroid series, and obvious methyltrimethyltridecylchromans. The geochemical parameters reflecting the source and sedimentary environment in naphthalene series, phenanthrene series, biphenyl series, three-fluorene series, and triaromatic steroid series were systematically analyzed. Analysis of the results showed that studied oil samples from the East Fukang Sag were of continental origin and deposited in a weakly oxidizing to weakly reducing environment with fresh-brackish water. Oil type I was characterized by considerably abundant terrestrial higher plant organic matter inputs, while Oil type II was typical with obviously lower aquatic organisms. Maturity-related parameters calculated from alkyl naphthalenes, alkyl phenanthrenes, alkyl dibenzothiophenes, and methyltrimethyltridecylchromans showed that all the studied oil samples have reached the mature stage.

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“…The TOC content of coaly shale changed between 0.25 and 14.83 wt % (average value: 4.32 wt %). The overall quality of coaly shale and coal ranged from poor to good. , …”

Section: Geological Settingmentioning

confidence: 99%

Organic Geochemical Evidence for the Formation of Condensate from Coaly Source Rocks in the Wumaying Buried Hill of the Huanghua Depression, Bohai Bay Basin

Lou,

Wang,

Luo

et al. 2024

ACS Omega

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Although oil and gas from coaly source rocks have been widely discovered worldwide, the role of oil generated from coal measures in marine-continental coaly deposits during the Carboniferous-Permian period in the Bohai Bay Basin has long been a subject of debate. The recent discovery of a condensate reservoir in the Wumaying buried hill within the Huanghua Depression of the Bohai Bay Basin offers new potential insights into this issue. In this study, we employed organic geochemical methods to explore the possibility of the Carboniferous-Permian coal deposit being a primary source of the condensate. The distribution of light hydrocarbons and the biomarker assemblage indicate that the condensate did not undergo significant secondary alterations such as thermal cracking, gas invasion fractionation, or biodegradation. The hydrocarbon generation potential of the Carboniferous-Permian coaly source rocks suggests that they could be an important contributor to the formation of condensate. High pristine/phytane ratios (1.0−7.5), an abundant presence of benzene series, and the dominance of C 29 steranes (>50%) within the condensate could be indicative of coaly organic matter. These features are comparable to those found in coaly source rocks. Moreover, the stable carbon isotopic compositions of n-alkanes in the condensate, ranging from −26.0 to −30.0‰, correlate well with those from coaly mudstone (−25.4 to −30.0‰). This suggests that the condensate of the Wumaying buried hill may predominantly originate from the Carboniferous-Permian coaly mudstone. When integrated with the geological background, the results distinctly demonstrate that the Carboniferous-Permian coaly source rocks have significantly contributed to the formation of the condensate reservoir in the Wumaying buried hill. This provides an essential reference for future exploration of oil and gas resources derived from the carboniferous-Permian coaly source rocks in the Bohai Bay Basin.

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Thermal evolution and applications of aromatic hydrocarbons in highly mature coal-bearing source rocks of the Upper Triassic Xujiahe Formation in the northern Sichuan Basin

Cited by 9 publications

References 18 publications

Biomarker distributions and depositional environments of continental source rocks in Sichuan Basin, SW China

Biomarker distributions and depositional environments of continental source rocks in Sichuan Basin, SW China

Geochemical characteristics and significance of aromatic hydrocarbons in crude oil from the East Fukang Sag, Junggar Basin, NW China

Organic Geochemical Evidence for the Formation of Condensate from Coaly Source Rocks in the Wumaying Buried Hill of the Huanghua Depression, Bohai Bay Basin

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