Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs

Duanxin Chen; Shiguo Wu; Dongdong Dong; Lijun Mi; Shaoying Fu; Hesheng Shi

doi:10.1007/s00343-013-2075-5

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Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs

OriginalPaper | Updated：2023-05-16

- Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs
- Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs
- 海洋湖沼学报（英文） 2013年31卷第1期页码：178-189
- Affiliations：
  
  1. Key Laboratory of Marine Geology & Environment Institute of Oceanology Chinese Academy of Sciences
  2. Graduate University of Chinese Academy of Sciences
  3. Exploration Department China National Offshore Oil Corporation (CNOOC)
  4. Guangzhou Marine Geology Survey
  5. Shenzhen Branch of CNOOC
- Author bio：
- Funds：
  
  Supported by the National Natural Science Foundation of China (Nos. 40930845 and 41006031), the International Science & Technology Cooperation Program of China (No. 2010DFA21740), and the National Science and Technology Major Project (No. 2011ZX05026-004-06)
- DOI：10.1007/s00343-013-2075-5
  中图分类号：
- 网络首发：2013-01-16，
  
  纸质出版：2013
- Accepted：
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Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs[J]. 海洋湖沼学报（英文）, 2013,31(1):178-189.

Chen, D., Wu, S., Dong, D. et al. Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs., Chin. J. Ocean. Limnol. 31, 178–189 (2013). https://doi.org/10.1007/s00343-013-2075-5
Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs[J]. 海洋湖沼学报（英文）, 2013,31(1):178-189. DOI： 10.1007/s00343-013-2075-5.

Chen, D., Wu, S., Dong, D. et al. Focused fluid flow in the Baiyun Sag, northern South China Sea: implications for the source of gas in hydrate reservoirs., Chin. J. Ocean. Limnol. 31, 178–189 (2013). https://doi.org/10.1007/s00343-013-2075-5 DOI：

摘要

Abstract

The origin and migration of natural gas and the accumulation of gas hydrates within the Pearl River Mouth Basin of the northern South China Sea are poorly understood. Based on high-resolution 2D/3D seismic data

three environments of focused fluid flow: gas chimneys

mud diapirs and active faults have been identified. Widespread gas chimneys that act as important conduits for fluid flow are located below bottom simulating reflections and above basal uplifts. The occurrence and evolution of gas chimneys can be divided into a violent eruptive stage and a quiet seepage stage. For most gas chimneys

the strong eruptions are deduced to have happened during the Dongsha Movement in the latest Miocene

which are observed below Pliocene strata and few active faults develop above the top of the Miocene. The formation pressures of the Baiyun Sag currently are considered to be normal

based on these terms: 1) Borehole pressure tests with pressure coefficients of 1.043–1.047; 2) The distribution of gas chimneys is limited to strata older than the Pliocene; 3) Disseminated methane hydrates

rather than fractured hydrates

are found in the hydrate samples; 4) The gas hydrate is mainly charged with biogenic gas rather than thermogenic gas based on the chemical tests from gas hydrates cores. However

periods of quiet focused fluid flow also enable the establishment of good conduits for the migration of abundant biogenic gas and lesser volumes of thermogenic gas. A geological model governing fluid flow has been proposed to interpret the release of overpressure

the migration of fluids and the formation of gas hydrates

in an integrated manner. This model suggests that gas chimneys positioned above basal uplifts were caused by the Dongsha Movement at about 5.5 Ma. Biogenic gas occupies the strata above the base of the middle Miocene and migrates slowly into the gas chimney columns. Some of the biogenic gas and small volumes of thermogenic gas eventually contribute to the formation of the gas hydrates.

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references

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