莺歌海盆地中央底辟带油气成藏条件分析

doi:10.11743/ogg20000309

Abstract

Abstract:

Yinggehai Sea Basin is situated in the west of Hainan Island and the east of Zhongnan Peninsula and stretches in NW-SE direction.The basin consists of central diapiric zone and a slope zone.Two sets of source rocks including Miocene Yinggehai,Huangliu,Meishan and Sanya Formations and Oligocene Yacheng Formation developed in the diapiric zone.Oil threshold is between 2 800～3 000 m depth.The traps were formed by the upward arch of diapiric fluid,and episodic diapir activity determined hydrocarbon episodic migration.Different migration dynamic forces resulted in different types of oil and gas pools:under high temperature,high pressure and uncompaction,the Miocene source rocks formed high pressure pocket which break overlying strata and formed deep and shallow gas pools;deep seated inorganic CO₂ under high pressure expelled the hydrocarbon gas near fractures,destoried the original gas pools and formed new hydrocarbon gas pools with little Co₂.

Key words: hydrocarbon source rock, diapirism, high pressure pocket, hydrocarbon pool, Yinggehai Sea Basin

CLC Number:

TE122

Gong Shaobo, Wang Yan. ANALYSIS ON HYDROCARBON POOL-FORMING CONDITION OF CENTRAL DIAPIRIC ZONE IN YINGGEHAI SEA BASIN[J]. Oil & Gas Geology, 2000, 21(3): 232-235.

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ANALYSIS ON HYDROCARBON POOL-FORMING CONDITION OF CENTRAL DIAPIRIC ZONE IN YINGGEHAI SEA BASIN

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