琼东南盆地超压系统泄压带: 可能的天然气聚集场所

翟普强; 陈红汉

doi:10.3799/dqkx.2013.081

Volume 38 Issue 4

Jul. 2013

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ZHAI Pu-qiang, CHEN Hong-han, 2013. Discharging Zones of Overpressure System in Qiongdongnan Basin, Northern South China Sea: Implications for Favorable Sites of Natural Gas Accumulation. Earth Science, 38(4): 832-842. doi: 10.3799/dqkx.2013.081

Citation:

ZHAI Pu-qiang, CHEN Hong-han, 2013. Discharging Zones of Overpressure System in Qiongdongnan Basin, Northern South China Sea: Implications for Favorable Sites of Natural Gas Accumulation. Earth Science, 38(4): 832-842. doi: 10.3799/dqkx.2013.081

Citation:

ZHAI Pu-qiang, CHEN Hong-han, 2013. Discharging Zones of Overpressure System in Qiongdongnan Basin, Northern South China Sea: Implications for Favorable Sites of Natural Gas Accumulation. Earth Science, 38(4): 832-842. doi: 10.3799/dqkx.2013.081

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Discharging Zones of Overpressure System in Qiongdongnan Basin, Northern South China Sea: Implications for Favorable Sites of Natural Gas Accumulation

doi: 10.3799/dqkx.2013.081

ZHAI Pu-qiang^{1, 2
,},
CHEN Hong-han^{1, 2
,
,}

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2013-03-26
Publish Date: 2013-07-01

Abstract

Abstract

Discharging zones are channels for fluid to move out from inside the overpressure system and favorable sites for petroleum accumulation, which are of great significance to the accumulation of water-soluble gas by exsolution. The overpressure system distribution of Qiongdongnan basin is predicted and divided into three types based on the comprehensive analysis of the velocity spectrum, logging, drilling and formation test data. In addition, four types of discharging zones are identified according to the mineral analysis. The distribution of discharging zones and possible sites for petroleum accumulation are finally discussed. There exists only one overpressure system which is effected by the development of continental slop system and the pressure transfer from Yinggehai basin, the pressure along the slop belt is much stronger and the top surface of overpressure system in the west is shallower than that in the east. Accumulation of water soluble gas in the pressure discharging zones is totally determined by pressure, temperature and the amount of dissolved gas, and it is vital whether there is adequate amount of dissolved gas and sufficient changes in solubility.The accumulation conditions of type II discharging zone are the most favorable one, resulting in more active fluid activities. The favorable sites of type III discharging zone are distributed near the Lingshui low uplift and the northern slop of Baodao sag, along boundary faults and close to the normal pressure zone.
- discharge zones,
- overpressure system,
- fluid migration,
- degasification,
- hydrocarbon accumulation,
- Qiongdongnan basin,
- petroleum geology

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References(43)

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Discharging Zones of Overpressure System in Qiongdongnan Basin, Northern South China Sea: Implications for Favorable Sites of Natural Gas Accumulation

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