Distribution and characteristics of gas chimneys in the passive margin offshore SW Taiwan

Han, Wei-Chung; Chen, Liwen; Liu, Char‐Shine

doi:10.1007/s11001-021-09447-9

Cited by 3 publications

(2 citation statements)

References 67 publications

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“…The higher bacterial diversity of N31 and N36 was influenced by various factors. They were located near the port on the southwest side of Taiwan, existing obvious submarine landslides (Zhang et al, 2021) and being close to the production site of natural gas hydrate (Han et al, 2021). The deep Pacific ocean current flowing in from the Luzon Strait passed through the area first which might carry organic pollutants from the east side of Taiwan Island (Wang et al, 2018),.…”

Section: Benthic Bacterial Community Composition and Distribution Pat...mentioning

confidence: 99%

Bacterial Communities and Culturable Petroleum Hydrocarbon Degrading Bacteria in Marine Sediments in the Northeastern South China Sea

Wang

Qiao

Wei

et al. 2022

Front. Environ. Sci.

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Marine oil spill pollution was one of the factors affecting the marine ecology of the northeastern South China Sea (nSCS). The submarine oil produced after the oil spill had a long-term impact on the microbial community in the sediment. In this study, 16S rRNA genes high-throughput sequencing and quantitative PCR were used to study the composition and distribution of bacterial communities in deep-sea sediments; meanwhile, petroleum hydrocarbon degrading bacteria were isolated, of which activity were detected. Proteobacteria and Planctomycetota were the main bacterial phyla found in the samples studied in this study. 29 bacterial strains capable of degrading petroleum hydrocarbons were isolated from S02 and S39 sediment samples, belonging to genus Stenotrophomonas, Pseudidiomarina, Sulfitobacter, Pseudomonas, Halomonas and so on. Strains from Stenotrophomonas degraded petroleum hydrocarbons efficiently. This research provided new insights into distribution pattern of benthic microbial community in the nSCS, and validated the degradation potential of petroleum hydrocarbons by indigenous bacteria.

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Section: Benthic Bacterial Community Composition and Distribution Pat...mentioning

confidence: 99%

Bacterial Communities and Culturable Petroleum Hydrocarbon Degrading Bacteria in Marine Sediments in the Northeastern South China Sea

Wang

Qiao

Wei

et al. 2022

Front. Environ. Sci.

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“…A seismically imaged gas chimney is a type of stratigraphic sedimentary and hydraulic area where vertical seismic reflection profiles generally indicate that seafloor geological structures in this layer possess excellent transport capacity for upward gas-bearing fluids, 2 of 18 and also lots of methane gas is trapped in conduit pores [5][6][7]. It ordinarily extends several strata sequences, provides an effective aisle for functionally connecting deep hydrocarbon sources with the shallow bottom boundary of the local gas hydrate stability zone (HSZ), and conveys these multiphase fluids into the seafloor surface through affiliated pipe structures on many occasions [8,9]. Hovland and Sommerville (1985) reported the identification of gas-charged sediments and the characteristics of two natural gas seepages in the North Sea, which suggested a gas-liquid mixture fluid seepage caused the pockmark development [10].…”

Section: Introductionmentioning

confidence: 99%

Representative Dynamic Accumulation of Hydrate-Bearing Sediments in Gas Chimney System since 30 Kyr BP in the QiongDongNan Area, Northern South China Sea

Guan,

Wang,

Zhang

et al. 2024

JMSE

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A stratigraphic complex composed of mass transport deposits (MTDs), where the gas occurrence allows for the formation of a gas chimney and pipe structure, is identified based on seismic interpretation in the QiongDongNan area of the northern South China Sea. During the Fifth Gas Hydrate Drilling Expedition of the Guangzhou Marine Geological Survey, this type of complex morphology that has close interaction with local gas hydrate (GH) distribution was eventually confirmed. A flow-reaction model is built to explore the spatial–temporal matching evolution process of massive GH reservoirs since 30 kyr before the present (BP). Five time snapshots, including 30, 20, 10, and 5 kyr BP, as well as the present, have been selected to exhibit key strata-evolving information. The results of in situ tensile estimation imply fracturing emergence occurs mostly at 5 kyr BP. Six other environmental scenarios and three cases of paleo-hydrate existence have been compared. The results almost coincide with field GH distribution below the bottom MTD from drilling reports, and state layer fracturing behaviors always feed and probably propagate in shallow sediments. It can be concluded that this complex system with 10% pre-existing hydrates results in the exact distribution and occurrence in local fine-grained silty clay layers adjacent to upper MTDs.

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New Insight on the Stratigraphic-Diffusive Gas Hydrate System since the Pleistocene in the Dongsha Area of the Northeastern South China Sea

Guan

Liang

Wang

et al. 2022

JMSE

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The stratigraphic-diffusive type of gas hydrate system is formed by microbial methane produced in a shallow slope space when flowing laterally into hydrate stable zones and is worth studying for both energy supply and academic understanding. A deposition production model matching the vertical and lateral seabed morphological characteristics was constructed to show the accumulation process, layer timing sequence, and reservoir quality of the stratigraphic-diffusive hydrate system in the Dongsha slope sediments since the Pleistocene. Six representative key system factors at three selected moments (1.5 Ma, 700 ka B.P., and at present) have been exhibited during debris is continuously accumulating. The coexistence of the hydrate decomposition in the lower part and the formation in the upper part, and the uneven distribution of hydrates within the slope sediment surface are explained clearly. By comparing four geological cases with diverse environments, it is shown that the diffusive hydrate system is likely to develop into moderate geological conditions. The most powerful carbon fixation ability in this system was quantified within the time range of 100−50 ka B.P. Finally, it was verified that residual methane would converge near the seafloor interface and then eventually overflow out of the seabed into the seawater.

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Distribution and characteristics of gas chimneys in the passive margin offshore SW Taiwan

Cited by 3 publications

References 67 publications

Bacterial Communities and Culturable Petroleum Hydrocarbon Degrading Bacteria in Marine Sediments in the Northeastern South China Sea

Bacterial Communities and Culturable Petroleum Hydrocarbon Degrading Bacteria in Marine Sediments in the Northeastern South China Sea

Representative Dynamic Accumulation of Hydrate-Bearing Sediments in Gas Chimney System since 30 Kyr BP in the QiongDongNan Area, Northern South China Sea

New Insight on the Stratigraphic-Diffusive Gas Hydrate System since the Pleistocene in the Dongsha Area of the Northeastern South China Sea

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