Stratigraphic Sequence and Sedimentary Systems in the Middle-Southern Continental Slope of the East China Sea from Seismic Reflection Data: Exploration Prospects of Gas Hydrate

Li, Deyong; Chen, Hongyan; Xu, Shan; Xing, Junhui; Cheng, Hui; Wang, Jinkai

doi:10.1007/s11802-019-3845-2

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…Preliminary results show that the Okinawa Trough, especially its northern slope, has the temperature and pressure, gas and structural conditions for gas hydrates. , Multichannel seismic data suggest that the Okinawa Trough has reliable BSR, amplitude blanking zone, polarity reversal, velocity inversion, and other geophysical signs. BSR is mainly distributed in the southern Okinawa Trough, then in the middle part and in the northern part, with the water depth is generally 300–1500 m, located at 380–470 mbsf. − In addition, some hydrate-related geological and geochemical marks, such as cold seep, mud volcano, , hydrocarbon anomalies in the bottom water, carbonate nodules, and authigenic pyrite have also been identified in the Okinawa Trough…”

Section: Occurrencesmentioning

confidence: 99%

A Review of the Resource and Test Production of Natural Gas Hydrates in China

et al. 2021

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China has been attaching great importance to research on natural gas hydrate resources. Since the mid-1990s, China has experienced three stages of resource prediction, investigation, and test production. Until now, five hydrate accumulations have been discovered by drilling and sampling in the Shenhu, Dongsha, Qiongdongnan Basins, and offshore Taiwan of the South China Sea and in the Muli area of Qilian Mountain, and seven hydrates have been inferred by various indicators, including geology, geophysics and geochemistry in the South China Sea, the East China Sea, and the Qinghai–Tibet Plateau. According to the hydrate stability zone, the natural gas hydrate resources in the South China Sea are estimated to be 64.6 × 1012 m3, those in the East China Sea are ∼28.5 × 1012 m3, and those in the terrestrial permafrost are ∼38 × 1012 m3. The total amount of the natural gas hydrates in China reaches up to 131.1 × 1012 m3, which is twice the amount of China’s conventional natural gas resources. China has successfully conducted the five field test production of gas hydrates in the Muli permafrost region of Qilian Mountain and in Shenhu area of the South China Sea since 2011, in particular first using horizontal well technologies to exploit hydrates that occurred in the fine-grained reservoirs. It is expected that commercial production from the hydrate reservoir will come true in the 2030s.

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Section: Occurrencesmentioning

confidence: 99%

A Review of the Resource and Test Production of Natural Gas Hydrates in China

et al. 2021

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“…The detected pathways favored by gas bypassing the overburden sediments include the high-angle faults and fractures; both of which largely increase the vertical permeability and hence provide the pressure communication for free gases with the surface [36]. Such kinds of faults have been documented to form by the back-arc extension [15] or occur within the underlying diapirs [11][12][13] (Figures 3(a) and 3(b)). Their spatial relationship with the geophysical signature of the free gases (e.g., acoustic wiping-out and curtain, Luan and Qin, 2005, Figure 3(c)) supports their common role in acting as the migration conduits.…”

Section: Geophysical Signaturementioning

confidence: 99%

“…The origin of methane surrounding the recent seeping sites has been determined from the carbon and hydrogen isotope values (δ 13 C CH 4 and δD CH 4 ) of the headspace gases sampled from piston and ROV push cores (7 m and 35 cm long, respectively, Figure 5) [28] and seafloor drill cores (55 m long, Figure 5) [16]. The results of the isotopic analysis of the pore water show that the methane in the shallow sediments was generated via the microbially mediated processes of carbon dioxide reduction (δ 13 C CH 4 < −50‰, microbial methane) and/or thermal cracking of organic matter (δ 13 C CH 4 > −50‰, thermogenic methane) [16,28]. These results seem to agree with the summary of the origin of methane-rich natural gas in the backarc region of active magmatism in the southernmost end of the OT [42] and the Western Pacific [43].…”

Section: Geochemical Constraintsmentioning

confidence: 99%

“…Multiple ship-based approaches have been used to focus on these seeps of different spatiotemporal dimensions. The acoustic ones mainly consist of seismic and echo-sounder, and together reveal the locations of the seeps and their features from the subsurface and the seabed to the water column [10][11][12][13][14][15][16]. The pore water and the authigenic minerals serve as the main geological record of the seeps and have been sampled by grabbing of remotely operated vehicles (ROVs), dredging and gravity-piston coring, and seafloor drilling.…”

Section: Introductionmentioning

confidence: 99%

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Review of Methane Seepages in the Okinawa Trough: Progress and Outlook

et al. 2021

Geofluids

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It has been two decades since the cold seeps were firstly found in the Okinawa Trough (OT). The scientific cruises and the geological surveys since then have unveiled the currently active submarine methane seeps and significantly improved the understanding of methane seeps in the back-arc basin of the OT. In this paper, we review the up-to-date progress of the research of methane seepages then put forward the promising, yet challenging, outlook by listing the unsolved questions of the cold seeps in the OT. Multiple approaches and techniques, including seismic and echo-sounder recording, dredging, gravity-piston and ROV coring, seafloor drilling, and isotopic and microarray-based genomic analysis, have been used to reveal the geological processes responsible for the seeping activities and the biogeochemical processes related to them. The geophysical signature associated with gas seeps mainly includes the acoustic turbidity in the subsurface, the anomaly of the backscattering intensity at the seabed, and the gas plumes observed in the water column. Pore water and methane-derived authigenic carbonate archive the intensification of methane seepage and the paleoenvironment changes at different time scales. The methane feeding of the seeps in the OT was generated mostly via the microbially mediated process and has an origin mixed by thermogenic hydrocarbon gas in the middle OT. Sulfate-driven and Fe-driven anaerobic oxidations of methane are suggested to be the key biogeochemical processes, which would shape the material cycling in the seeping environment. The future research on the cold seeps in the OT is worth looking forward to due to its geographic and potential geologic links with the nearby hydrothermal activities. Multidisciplinary studies are expected to concentrate on their link with the undiscovered gas hydrates, the amount of methane transferring into the oceans and its impact on the climatic change, and the evolution of the seeping activities accompanied by the biogeochemical processes.

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The quintessential s-shape in sedimentology: A review on the formation and controls of clinoform shape

Anell

2024

Earth-Science Reviews

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Stratigraphic Sequence and Sedimentary Systems in the Middle-Southern Continental Slope of the East China Sea from Seismic Reflection Data: Exploration Prospects of Gas Hydrate

Cited by 5 publications

References 36 publications

A Review of the Resource and Test Production of Natural Gas Hydrates in China

A Review of the Resource and Test Production of Natural Gas Hydrates in China

Review of Methane Seepages in the Okinawa Trough: Progress and Outlook

The quintessential s-shape in sedimentology: A review on the formation and controls of clinoform shape

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