NON-HYDROCARBON GAS DISTRIBUTION AND ITS GEOLOGICAL CONDITIONS AND CONTROLLING FACTORS IN THE MARGINAL BASIN OF NORTHERN SOUTH CHINA SEA

HE Jiaxiong; MA Wenhong; CHEN Shenghong; GONG Xiaofeng

doi:10.3724/SP.J.1140.2011.02095

2011 Vol. 31, No. 2

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Article navigation > Marine Geology & Quaternary Geology > 2011 > 31(2): 95-104

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HE Jiaxiong, MA Wenhong, CHEN Shenghong, GONG Xiaofeng. NON-HYDROCARBON GAS DISTRIBUTION AND ITS GEOLOGICAL CONDITIONS AND CONTROLLING FACTORS IN THE MARGINAL BASIN OF NORTHERN SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2011, 31(2): 95-104. doi: 10.3724/SP.J.1140.2011.02095

Citation:

HE Jiaxiong, MA Wenhong, CHEN Shenghong, GONG Xiaofeng. NON-HYDROCARBON GAS DISTRIBUTION AND ITS GEOLOGICAL CONDITIONS AND CONTROLLING FACTORS IN THE MARGINAL BASIN OF NORTHERN SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2011, 31(2): 95-104. doi: 10.3724/SP.J.1140.2011.02095

NON-HYDROCARBON GAS DISTRIBUTION AND ITS GEOLOGICAL CONDITIONS AND CONTROLLING FACTORS IN THE MARGINAL BASIN OF NORTHERN SOUTH CHINA SEA

1 Key Laboratory of Marginal Sea Geology, CAS, Guangzhou, Guangdong 510640, China;
2 Zhanjiang Branch, CNOOC, Zhanjiang, Guangdong 524057, China;
3 Shenzhen Branch, CNOOC, Shenzhen, Guangdong 510240, China

Received Date: 10 September 2010

Revised Date: 21 October 2010

Abstract

Abstract

Non-hydrocarbon gases,such as CO2 (carbon dioxide)and N2 (nitrogen),have been discovered in the marginal basin of northern South China Sea.The formation and accumulation of these gases require some specific geological conditions and controlling factors.The CO2 of Crustal type and crust-mantle mixed type and the N2 of crustal organic type and crustal organic-inorganic hybrid type are mainly enriched in the shallow part of the central diapir area of the Yinggehai basin along the northwest strike-slip extensional edge of the northern South China Sea,under the joint control of marine calcareous shale and the physical and chemical activities caused by the heat flow derived from mud diapiric intrusion;and the mantle-type volcanic CO2 is mainly distributed around the deep faults on the borders of the depressions in the eastern Qiongdongnan basin and along the salients in the Zhujiangkou basin.The degasification of the volcanic mantle provided the gas sources and the deep faults were the path for gas migration to traps.
- northern South China Sea /
- basin structure types /
- non-hydrocarbon gas distribution /
- formation of geological conditions /
- main controlling factors

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References

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