Facies architecture and depositional model of a macrotidal incised-valley succession (Qiantang River estuary, eastern China), and differences from other macrotidal systems

Xia, Zhang; Lin, Chun-Ming; Dalrymple, Robert W.; Gao, Shu; Li, Yanli

doi:10.1130/b30835.1

Cited by 48 publications

(42 citation statements)

References 32 publications

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“…Zhou and Gao 2004), with grain-size parameters determined using the GRADI-STAT software (Blott and Pye 2001). Eighty-three samples were collected for foraminifera analysis using the method described by Zhang et al (2014) and Wang et al (1988). The permeabilities of 16 samples were measured by falling-head permeability test apparatus (cf.…”

Section: Methodsmentioning

confidence: 99%

“…Generally speaking, the size, thickness, and permeability of the sand bodies in the study area are considerably lower than those of the sand bodies from the same facies in the late Quaternary Qiantang River incised-valley fill (Zhang et al 2013(Zhang et al , 2014. The sand bodies in Facies III of the Qiantang River incised-valley fill are characterized by a thickness of 3-20 m, burial depth of 28-78 m, width of 0.4-2 km, and permeability of 577-4,590 mD (Zhang et al 2013(Zhang et al , 2014. The potential shallow biogenic-gas reservoirs in Facies V occur in the local highs, which are capped directly by the mud of Facies IV, and have a burial depth of 58-70 m (Fig.…”

Section: Reservoirsmentioning

confidence: 99%

“…This facies represents part of the river system and may have been deposited in a channel thalweg to bar environment (cf. Nittrouer et al 2011;Zhang et al 2014). Facies IV (Floodplain Sediments) consists mainly of an alternation of gray mud and grayish-yellow sandy silt, silt, and gravelly sand (Figs.…”

Section: Stratigraphic Architecturementioning

confidence: 99%

“…Incised valleys generally have high preservation potential for their fill deposits (Dalrymple et al 1994) and provide a fundamental and important background for the formation of the shallow biogenic-gas reservoirs therein, i.e., gas-source beds, cap beds, and sand reservoirs can occur together in close geographic and stratigraphic proximity (Xu et al 2009;Lin et al 2004;Zhang et al 2014). Considerable biogenic-gas accumulations with depth \120 m have been discovered and well documented in the late Quaternary Qiantang River incised valley with a predicted total gas amount of 244.5 9 10 9 m 3 (Lin et al 2004Zhang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Shallow biogenic-gas reservoirs are principally distributed along the eastern and southern coasts of China, especially the Jiangsu-Zhejiang coastal plain area, where the postglacial Changjiang and Qiantang River incised valleys are located (Wang 1982;Zheng 1998;Lin et al 2004;Liu et al 2008;Li et al 2010a;Zhang et al 2013Zhang et al , 2014. Incised valleys generally have high preservation potential for their fill deposits (Dalrymple et al 1994) and provide a fundamental and important background for the formation of the shallow biogenic-gas reservoirs therein, i.e., gas-source beds, cap beds, and sand reservoirs can occur together in close geographic and stratigraphic proximity (Xu et al 2009;Lin et al 2004;Zhang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

Zhang

Lin

2017

Pet. Sci.

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The Changjiang (Yangtze) is one of the largest rivers in the world. It formed a huge incised valley at its mouth during the Last Glacial Maximum; the incised-valley fill, approximately 80-110 m thick, supplies an important foundation for the generation of shallow biogenic-gas reservoirs. Two cores and 13 cone penetration tests were used to elaborate the characteristics, formation mechanism, and distribution of the shallow biogenic-gas reservoirs in the study area. The natural gas is mainly composed of CH 4 (generally[95%) with a d 13 C CH4 and d 13 C CO2 of -75.8 to -67.7% and -34.5 to -6.6%, respectively, and a dD CH4 of -215 to -185%, indicating a biogenic origin by the carbon dioxide reduction pathway. Commercial biogenic gas occurs primarily in the sand bodies of fluvial-channel, floodplain, and paleo-estuary facies with a burial depth of 50-80 m. Gas sources as well as cap beds are gray to yellowish-gray mud of floodplain, paleoestuary, and offshore shallow marine facies. The organic matter in gas sources is dominated by immature type III kerogen (gas prone). The difference in permeability (about 4-6 orders of magnitude) between cap beds and reservoirs makes the cap beds effectively prevent the upward escape of gas in the reservoirs. This formation mechanism is consistent with that for the shallow biogenic gas in the late Quaternary Qiantang River incised valley to the south. Therefore, this study should provide further insight into understanding the formation and distribution of shallow biogenic gas in other similar postglacial incised-valley systems.

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Section: Methodsmentioning

confidence: 99%

Section: Reservoirsmentioning

confidence: 99%

Section: Stratigraphic Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

Zhang

Lin

2017

Pet. Sci.

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Predicting sediment flux from continental shelf islands, southeastern China

Xia

Jia

et al. 2020

J. Ocean. Limnol.

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Sediment flux from the Zhoushan Archipelago, eastern China

Gao

Wang

et al. 2018

J. Geogr. Sci.

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Knowledge of the sediment flux derived from different sources is critical for interpreting the sedimentary records associated with large river sedimentary systems. For the Changjiang River system, previous studies hardly focused on the sediment load from the adjacent Zhoushan Archipelago (ZA). Based on four prediction models, aiming to improve the understanding of the sediment load from the ZA during the Holocene, we show that the predicted sediment flux of the ZA ranges from ~0.7 to 26.5 Mt•yr-1 , with an average value of 10.7 Mt•yr-1 , and the islands with a relatively large area or high relief contribute greatly to the total flux. This sediment load is an order of magnitude lower than that of the Changjiang River, but it is similar to those of the local small rivers. Located in the core area of the southward dispersal path of the Changjiang River plume, the ZA also influences the sediment transport into Hangzhou Bay and over the Zhejiang-Fujian coastal seas. On the Holocene temporal scale, e.g., for the period from 6 ka BP to 2 ka BP, the sediments discharged from the ZA had a considerable effect on the shelf sedimentary system. This study provides evidence for an important role an archipelago can play in terms of sediment supply and transport in coastal and inner continental shelf regions.

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Facies architecture and depositional model of a macrotidal incised-valley succession (Qiantang River estuary, eastern China), and differences from other macrotidal systems

Cited by 48 publications

References 32 publications

Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

Predicting sediment flux from continental shelf islands, southeastern China

Sediment flux from the Zhoushan Archipelago, eastern China

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