Geochemistry, origin, and deep-water exploration potential of natural gases in the Pearl River Mouth and Qiongdongnan basins, South China Sea

Zhu, Weilin; Huang, Baojia; Mi, Lijun; Wilkins, R. J.; Fu, Ning; Xiao, Xia

doi:10.1306/02170908099

Cited by 182 publications

(150 citation statements)

References 18 publications

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“…1a). It is a Cenozoic rift basin developed on Mesozoic basement and contains a thickness of 6000e12,000 m Tertiary to Quaternary sediments (Zhu, 2007, Zhu et al, 2009.…”

Section: Geological Settingmentioning

confidence: 99%

“…As illustrated in Fig. 2, the structural evolution of the basin can be divided into two stages: Eocene-Oligocene rift stage and Neogene-Quaternary post-rift thermal subsidence stage (Ru and Pigott, 1986;Gong and Li, 1997;Huang et al, 2003b;Zhu, 2007Zhu, , 2009 and coastal plain coal-bearing sediments. This coal-bearing formation is believed to be the main hydrocarbon source rock in the basin (Huang et al, 2003b;Xiao et al, 2006).…”

Section: Geological Settingmentioning

confidence: 99%

“…3), and the diapiric faults can act as preferential pathways for the upward migration of natural gases from the deep sources into the Miocene sandstone bodies. The major tectonic control in this area is associated with SW/NE extensional faults that have controlled the deposition of both the Paleogene and Neogene sediments (Zhu et al, 2009).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Qiongnandong Basin is characterized by high sedimentation rates of up to 1.2 mm/year (Zhu, 2007, Zhu et al, 2009) and a high present-day geothermal gradient of up to 39e45 C/km (Shi et al, 2014). As a result of rapid sediment loading, overpressure associated with undercompaction is a common phenomenon at depths greater than 3300 m beneath the sea surface throughout the central Qiongdongnan Basin, especially in the deepwater area.…”

Section: Geological Settingmentioning

confidence: 99%

“…The gases in Y13-1 gas field is believed to originate from the deeply-buried Oligocene Yacheng Formation source rocks in the Qiongdongnan Basin (Huang, 1999(Huang, , 2003bXiao et al, 2006;Zhu et al, 2009). However, little information on the origin and accumulation of gases in the deep water part of the basin has been documented.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

Huang

Tian

Li³

et al. 2016

Marine and Petroleum Geology

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“…1a). It is a Cenozoic rift basin developed on Mesozoic basement and contains a thickness of 6000e12,000 m Tertiary to Quaternary sediments (Zhu, 2007, Zhu et al, 2009.…”

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

Huang

Tian

Li³

et al. 2016

Marine and Petroleum Geology

Self Cite

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True Volumes of Slope Failure Estimated From a Quaternary Mass‐Transport Deposit in the Northern South China Sea

Sun

Alves

et al. 2018

Geophysical Research Letters

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Submarine slope failure can mobilize large amounts of seafloor sediment, as shown in varied offshore locations around the world. Submarine landslide volumes are usually estimated by mapping their tops and bases on seismic data. However, two essential components of the total volume of failed sediments are overlooked in most estimates: (a) the volume of subseismic turbidites generated during slope failure and (b) the volume of shear compaction occurring during the emplacement of failed sediment. In this study, the true volume of a large submarine landslide in the northern South China Sea is estimated using seismic, multibeam bathymetry and Ocean Drilling Program/Integrated Ocean Drilling Program well data. The submarine landslide was evacuated on the continental slope and deposited in an ocean basin connected to the slope through a narrow moat. This particular character of the sea floor provides an opportunity to estimate the amount of strata remobilized by slope instability. The imaged volume of the studied landslide is ~1035 ± 64 km3, ~406 ± 28 km3 on the slope and ~629 ± 36 km3 in the ocean basin. The volume of subseismic turbidites is ~86 km3 (median value), and the volume of shear compaction is ~100 km3, which are ~8.6% and ~9.7% of the landslide volume imaged on seismic data, respectively. This study highlights that the original volume of the failed sediments is significantly larger than that estimated using seismic and bathymetric data. Volume loss related to the generation of landslide‐related turbidites and shear compaction must be considered when estimating the total volume of failed strata in the submarine realm.

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Joint control of pressure and gas hydrate stability zone on hydrate occurrences

Deng

Kuang

Jiang

et al. 2022

Preprint

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Most fracture-filling hydrates are discovered in the clay-domain sediments shallower than 200 meters below seafloor, while pore-filling hydrates were found in deeper sediments except for shallow sands worldwide. The controlling mechanisms for the occurrences of different types of hydrates are universally unrecognized. In this study, the ubiquitous hydrate reservoirs recovered in the northern South China Sea are categorized into three types based on the depth of hydrate-bearing sediments and hydrate morphology, including 1) fracture-filling hydrates in shallow clay sediments, 2) shallow fracture-filling hydrates and associated hydrates in coarse grained sediments, and 3) pore-filling hydrates in deeper clay-domain sediments. By analyzing the in-situ pressures, a critical depth range (CDR) is found where capillary pressure almost equals to the sum of the minimum principal stress and tensile strength, and hydrate types are determined by the coupling relationship between the depth of bottom of gas hydrate stability zone (BGHSZ) and the depth of CDR. Above CDR where the capillary pressure is greater, gas first migrates by inducing fractures, and a BGHSZ shallower than CDR must be matched to produce fracture-filing hydrates. Below CDR where capillary pressure is basically less than fracturing pressure, gas prefers migrating between pores. If BGHSZ is deeper than CDR at the same time, pore-filling hydrates are forming below CDR. The formation of hydrate further reduces the permeability of sediments, blocking fluids to migrate into the sediments above CDR. This study reveals the controlling mechanisms of hydrate occurrences, and provide scientific implications for hydrate research worldwide.

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Geochemistry, origin, and deep-water exploration potential of natural gases in the Pearl River Mouth and Qiongdongnan basins, South China Sea

Cited by 182 publications

References 18 publications

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

True Volumes of Slope Failure Estimated From a Quaternary Mass‐Transport Deposit in the Northern South China Sea

Joint control of pressure and gas hydrate stability zone on hydrate occurrences

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