Molecular and Isotopic Characteristics of Mature Condensates from the East China Sea Shelf Basin Using GC×GC-TOFMS and GC-IRMS

Shan, Chao; Ye, Jiaren; Scarlett, Alan G.; Grice, Kliti

doi:10.1007/s12583-018-1001-3

Cited by 4 publications

(7 citation statements)

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“…The gammacerane index (gammacerane/C 30 hopane) could be used to examine the water salinity of depositional environments. However, the gammacerane index is less reliable to indicate the depositional environment of evaporite and carbonate rock because it might have an abnormal increase (Moldowan et al, 1985, 1991; Peters et al, 2005; Rohrback, ; Shan et al, 2019). The gammacerane index cannot be thus used to indicate the depositional environment of crude oil from the carbonate reservoir in the central subsag (Figure 9).…”

Section: Resultsmentioning

confidence: 99%

“…It suggests that natural gas is coal-type and the carbon isotope of natural gas in the central part is lighter. Figure 12, the ααα20RC 27 regular sterane, ranged from 0.35 to 0.42, was dominant in ααα20RC 27-29 regular steranes, indicating oil precursors in the three oilfields are mainly from algae (Huang & Meinschein, 1979;Moldowan et al, 1985;Shan et al, 2019;Volkman, 1986). The αββC 27-29 isomeric steranes are lower than αααC 27-29 regular steranes.…”

Section: Carbon Isotope Compositionsmentioning

confidence: 93%

“…Peters and Moldowan (1993) The relative ratios of C 27, C 28 , and C 29 regular steranes are widely used to characterize palaeo-depositional environment. In general, C 27 regular sterane is mainly from lower phytoplankton (i.e., algae and plankton), C 28 regular sterane originates from diatoms, and, C 29 regular sterane is attributed to the terrestrial higher plants (Huang & Meinschein, 1979;Moldowan, Sundararaman, & Schoell, 1986;Shan, Ye, Scarlett, & Grice, 2019). In the central subsag, the ratio of C 27 regular sterane is from 0.3 to 0.41 with an average value of 0.33, and that of C 29 regular sterane is from 0.34 to 0.43 with an average value of 0.37.…”

Section: Steranes and Terpanesmentioning

confidence: 99%

“…However, the gammacerane index is less reliable to indicate the (Moldowan et al, 1985(Moldowan et al, , 1991Peters et al, 2005;Rohrback, ;Shan et al, 2019). The gammacerane index cannot be thus used to indicate the depositional environment of crude oil from the carbonate reservoir in the central subsag ( Figure 9).…”

Section: Steranes and Terpanesmentioning

confidence: 99%

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Geochemical characteristics and origin of petroleum in the southwest complicated fault subsag, Dongpu Depression of China's Bohai Bay Basin

et al. 2020

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The Dongpu Depression is one of the major petroliferous structures in the Bohai Bay Basin of eastern China. The Shahejie Formation is the key target unit for petroleum exploration in the Dongpu Depression. The current studies on this fossiliferous structure mainly focus on the northern depression, and the detailed study on the southern part of the depression is still scarce. To further study on the southeast subsag located in the southern part of this depression, we examined the geochemical characteristics and origin of petroleum using stable carbon isotopes, components of crude oil and natural gas, micro Fourier transform infrared spectroscopy (FT‐IS), gas chromatography (GC) and gas chromatography–mass spectrometry (GC–MS). Fluid inclusions and 1D model were employed to reconstruct the burial and thermal history and indicate the timing of hydrocarbon generation. Finally, the petroleum exploration in this region is guided based on the combination of geochemical results and geological setting. The result of geochemical characteristics of crude oils indicates the oil was from the combination of algal and terrestrial plants, deposited in reducing to sub‐oxic and fresh to marginally brackish environment. Furthermore, the oil in the northeastern part could be traced to the Haitongji subsag and has relatively lower thermal maturity than that in the central part. Stable carbon isotope data suggest that natural gas is a mixed oil‐type and coal‐type gas. The equation estimated indicates that natural gas in the northeast is mainly oil‐type gas, with an average ratio of 80.0%, whereas coal‐type gas is dominant in the central part (average percentage: 74.3%). Geochemical characteristics of hydrocarbon indicate that the Changyuan Fault was a migration pathway for the northeastern petroleum, whereas it gradually changed to be sealed towards the central part.

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Section: Resultsmentioning

confidence: 99%

Section: Carbon Isotope Compositionsmentioning

confidence: 93%

Section: Steranes and Terpanesmentioning

confidence: 99%

Section: Steranes and Terpanesmentioning

confidence: 99%

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Geochemical characteristics and origin of petroleum in the southwest complicated fault subsag, Dongpu Depression of China's Bohai Bay Basin

et al. 2020

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“…For revealing the hydrocarbon resource potential of source rocks, predecessors utilized the hydrocarbon generation potential method (Pang, Li, Li, & Jin, 2005) which has been applied to hydrocarbon exploration in many petroliferous basins, including the Triassic Yanchang Formation in the Ordos Basin, the Permian Lucaogou Formation in the Junggar Basin, the Middle–Lower Jurassic successions in the Sichuan Basin, and the Palaeogene Shahejie Formation in the Bohai Bay Basin (Bai et al, 2017; Hu et al, 2016; Jiang et al, 2017; Peng et al, 2016; Peng, Pang, Shi, Peng, & Xiao, 2018; Shan, Ye, Scarlett, & Grice, 2019; Song, Wang, Xu, Xu, & Sang, 2019; Xu et al, 2019; Yang, Liang, Niu, Feng, & You, 2017; Zhang et al, 2019, b; Zheng et al, 2019; Zou et al, 2019). All of these applications are helpful for objectively understanding the potential of a resource and provide theoretical bases for exploration.…”

Section: Introductionmentioning

confidence: 99%

The hydrocarbon generation and expulsion features of source rocks and tight oil potential of the second member of the Qiketai Formation, Shengbei area in the Turpan–Hami Basin, NW China

et al. 2020

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Significant progress in tight oil exploration has been reported in the second member of the Qiketai Formation (J2q2) in the Shengbei area of the Turpan–Hami Basin. Geochemical analyses were conducted to assess the quality of the J2q2 source rocks. The improved hydrocarbon generation potential method was utilized to quantify the hydrocarbon generation and expulsion features of the source rocks. The results showed that J2q2 source rocks were deposited in a reduced lacustrine setting with a high palaeoproductivity. The J2q2 source rocks are widely distributed (approximately 1,000 km2) and have a thickness that varies from 50 to 130 m. Moreover, they can be identified as a set of high‐quality source rocks (thermally mature rocks with Ro values >0.5%, consisting mainly of types I and II kerogen and possessing an average total organic carbon content of 2.68%). The oil–source correlation results reveal that the source of crude oil in the studied area is J2q2. The improved hydrocarbon generation potential method is established for different kerogen types to limit the influence of the kerogen type on the calculation. The hydrocarbon expulsion threshold of the type I model is located at Ro = 0.6%. The type II kerogen rocks have different characteristics, and the hydrocarbon expulsion threshold is located at Ro = 0.62%. The maximum hydrocarbon generation and expulsion intensities are 700 × 104 t/km2 and 400 × 104 t/km2, respectively. The hydrocarbon generation and expulsion amount of the J2q2 source rocks are 21.4 × 108 t and 12.3 × 108 t, respectively. The tight oil potential of the J2q2 tight oil in the Shengbei area is 4.09 × 108 t. The SB10 and SB6 well areas are favourable J2q2 tight oil exploration areas in the Shengbei area. The SB10 well area has the highest hydrocarbon generation and expulsion intensities in the study area and is the best tight oil exploration target.

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Isotopic Mass Spectrometry in Food and Environmental Chemistry

Picó

Barceló

2022

The Handbook of Environmental Chemistry

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Molecular and Isotopic Characteristics of Mature Condensates from the East China Sea Shelf Basin Using GC×GC-TOFMS and GC-IRMS

Cited by 4 publications

References 43 publications

Geochemical characteristics and origin of petroleum in the southwest complicated fault subsag, Dongpu Depression of China's Bohai Bay Basin

Geochemical characteristics and origin of petroleum in the southwest complicated fault subsag, Dongpu Depression of China's Bohai Bay Basin

The hydrocarbon generation and expulsion features of source rocks and tight oil potential of the second member of the Qiketai Formation, Shengbei area in the Turpan–Hami Basin, NW China

Isotopic Mass Spectrometry in Food and Environmental Chemistry

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