Mechanisms of petroleum accumulation in the Bozhong sub-basin, Bohai Bay Basin, China. Part 1: Origin and occurrence of crude oils

Hao, Fang; Zhou, Xinhuai; Zhu, Y.; Zou, Huayao; Bao, Xiaoyi; Kong, Qingying

doi:10.1016/j.marpetgeo.2008.09.005

Cited by 105 publications

(40 citation statements)

References 45 publications

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“…A Pr/Ph ratio >3.0 in general suggests oxic depositional conditions, while low values of the ratio (<0.8) typify strongly reducing (anoxic) conditions (Didyk et al, 1978). Intermediate values are thought to indicate suboxic conditions (Chen et al, 1996;Waseda and Nishita, 1997;Hao et al, 2009). The Pr/Ph ratios of most of the oil samples analysed range from 0.10 to 0.50, which suggests an anoxic source rock depositional environment.…”

Section: Source Rock Depositional Conditionsmentioning

confidence: 89%

Biomarker Geochemistry of Paleogene Crude Oils and Source Rocks From the Raoyang Sag, Bohai Bay Basin, Ne China: An Oil – Source Rock Correlation Study

Jiang

2021

Journal of Petroleum Geology

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This study presents a systematic geochemical analysis of Paleogene crude oils and source rocks from the Raoyang Sag in the Jizhong sub‐basin of the Bohai Bay Basin (NE China). The geochemical characteristics of fifty‐three oil samples from wells in four sub‐sags were analysed using gas chromatography (GC) and gas chromatography – mass spectrometry (GC‐MS). Twenty core samples of mudstones from Members 1 and 3 of the Eocene‐Oligocene Shahejie Formation were investigated for total organic carbon (TOC) content and by Rock‐Eval pyrolysis and GC‐MS to study their geochemistry and hydrocarbon generation potential. The oils were tentatively correlated to the source rocks.The results show that three groups of crude oils can be identified. Group I oils are characterized by high values of the gammacerane index and low values of the ratios of Pr/Ph, Ts/Tm, 20S/(20S+20R) C29 steranes, ββ/(ββ+αα) C29 steranes, C27 diasteranes/ C27 regular steranes and C27/C29 steranes. These oils have the lowest maturity and are interpreted to have originated from a source rock containing mixed organic matter deposited in an anoxic saline lacustrine environment. The biomarker parameter values of Group III oils are the opposite to those in Group I, and are interpreted to indicate a highly mature, terrigenous organic matter input into source rocks which were deposited in suboxic to anoxic freshwater lacustrine conditions. The parameter values of Group II oils are between those of the oils in Groups I and III, and are interpreted to indicate that the oils were generated from mixed organic matter in source rocks deposited in an anoxic brackish–saline or saline lacustrine environment.The results of the source rock analyses show that samples from Member 1 of the Shahejie Formation were deposited in an anoxic, brackish – saline or saline lacustrine environment with mixed organic matter input and are of low maturity. Source rocks in Member 3 of the Shahejie Formation were deposited in a suboxic to anoxic, brackish – saline or freshwater lacustrine environment with a terrigenous organic matter input and are of higher maturity. Correlation between rock samples and crude oils indicates that Group I oils were probably derived from Member 1 source rocks, while Group III oils were more likely generated by Member 3 source rocks. The Group II oils with transitional characteristics are likely to have a mixed source from both sets of source rocks.

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Section: Source Rock Depositional Conditionsmentioning

confidence: 89%

Biomarker Geochemistry of Paleogene Crude Oils and Source Rocks From the Raoyang Sag, Bohai Bay Basin, Ne China: An Oil – Source Rock Correlation Study

Jiang

2021

Journal of Petroleum Geology

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“…Generalized stratigraphy of the Bohai Bay Basin (revised after Hao et al ., ). Possible source rock intervals are marked.…”

Section: Regional Geological Settingmentioning

confidence: 97%

Cenozoic tectonic migration in the Bohai Bay Basin, East China

Zhao

Jiang

et al. 2016

Geological Journal

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Tectonic migration is a common geological process during basin formation and development. However, there are many disputes about the tectonic migration and its dynamic mechanism in the Bohai Bay Basin. By analysis of Cenozoic tectonic, sedimentation and magmatism migration processes in the Bohai Bay Basin, combined with previous studies, the Cenozoic tectonic migration law in the Bohai Bay Basin is summarized in this paper. Affected by the subduction of the Indian Plate to the Eurasian Plate, its far‐field effect of the related eastward asthenospheric extrusion and the subduction of the Pacific Plate to the Eurasian Plate, the Cenozoic Bohai Bay Basin is characterized by the gradual northeastward and eastward/seaward migration of tectonic units. The tectonic migration is accompanied by eastward migrations and younging of faulting, depressions in the Bohai Bay Basin, depocentres and subsidence centres and magmatism. Finally, based on intraplate and plate marginal processes and mechanisms, the tectonic migration mechanism in the Cenozoic Bohai Bay Basin is discussed in this paper. The gradual migration of tectonic–sedimentary‐basin‐forming movements is younger and younger towards the east, resulting from the combined effect of the collision and subduction among the Indian Plate and the Pacific Plate to the Eurasian Plate. Copyright © 2016 John Wiley & Sons, Ltd.

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“…The rifting intensity in this member is characterized by a relative low subsidence period without significant fault activity through the whole basin (Kamaye, Wang, & Chen, ). Furthermore, according to Hao et al (), during the deposition of the third member of the Shahejie Formation (Es3, 43–38 Ma), North China exhibited wet climate, whereas the climate in North China became arid between 38.0 and 32.8 Ma (during the deposition of the second and first members of the Shahejie Formation, Es2 and Es1). Arid climate led to inefficient supply of both water and sediments and intensive evaporation could result in a moderately saline lake during this interval.…”

Section: Geological Settingmentioning

confidence: 99%

“…As previous studies have shown, this interval comprises of a variety of mixed sediments with various lithologies including grey fine‐grained sandstone and siltstone intercalated with dark oil shale and mudstone, biogenic carbonates, and/or marl dolomite, which were deposited in lacustrine delta, shallow carbonate shoal, and shallow lake environments (Dong et al, ; He et al, ; Zhang, Hou, Wang, Wang, & Wang, ). Changes in rifting intensity and climate in the evolution history seem to have controlled the deposition and distribution of the Member 1 lithofacies (Hao et al, ). The rifting intensity in this member is characterized by a relative low subsidence period without significant fault activity through the whole basin (Kamaye, Wang, & Chen, ).…”

Section: Geological Settingmentioning

confidence: 99%

Sedimentary features and their controls in a mixed siliciclastic–carbonate system in a shallow lake area: An example from the BZ‐X block in the Huanghekou Sag, Bohai Bay Basin, Eastern China

Xie

et al. 2018

Geological Journal

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Mixed siliciclastic–carbonate sediments were well developed in the BZ‐X block as a subunit in the Huanghekou Sag in the southeastern part of the Bohai Bay Basin (China) during the Member 1 of the Shahejie Formation. An integrated approach based on detailed microscopic observation and core descriptions was applied to characterize the lithofacies types, facies associations, and depositional environment of the mixed sediments system. A detailed sedimentary facies analysis suggests that various lithofacies types can be grouped into four facies associations: mixed bioclastic sandy beaches (FA1), mixed clastic bioclastic shoal (FA2), mixed sandy oolitic shoals (FA3), and mixed distal bioclastic sandy beaches (FA4). These facies associations are interpreted to be deposited in varying depositional environments ranging from foreshore to shoreface setting in a shallow lake setting. An interplay of the climate regime, nearshore carbonate productivity, and current activity was proved to control the lithofacies types, dispersion and depositional environment change of mixed sediments in different depositional phases. Meter‐scale mixed cycles were found in this shallow lake setting and their features seem to differ from the classical mixed sediment models. It is suggested that these particular cycles in the stratigraphic record might indicate a typical mark of mixed sediment system in shallow areas of the lacustrine basin.

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Mechanisms of petroleum accumulation in the Bozhong sub-basin, Bohai Bay Basin, China. Part 1: Origin and occurrence of crude oils

Cited by 105 publications

References 45 publications

Biomarker Geochemistry of Paleogene Crude Oils and Source Rocks From the Raoyang Sag, Bohai Bay Basin, Ne China: An Oil – Source Rock Correlation Study

Biomarker Geochemistry of Paleogene Crude Oils and Source Rocks From the Raoyang Sag, Bohai Bay Basin, Ne China: An Oil – Source Rock Correlation Study

Cenozoic tectonic migration in the Bohai Bay Basin, East China

Sedimentary features and their controls in a mixed siliciclastic–carbonate system in a shallow lake area: An example from the BZ‐X block in the Huanghekou Sag, Bohai Bay Basin, Eastern China

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