莺歌海盆地乐东气田天然气地化特征和成藏史

doi:10.11743/ogg20050421

Abstract

Abstract:

Reservoir fluids in the Ledong gas field in Yinggehai basin have obvious heterogeneity.The natural gas is mainly composed of methane,CO₂ and nitrogen.Thermogenic hydrocarbon gases were sourced from the mudstones in Miocene Meishan-Sanya Fms.Most of nitrogen were generated from the organic materials of the source rocks during mature and post-mature stages.Inorganic CO₂ might be the results of thermal decomposition of carbonate minerals and reactions between carbonate and clay minerals in deeply buried sedimentary strata.In addition,some of the CO₂ might be generated by thermal decomposition of the pre-Tertiary carbonate rocks and a little amount of the CO₂ might be added from the mantle.According to the chemical composition and carbon isotope data,it is preliminarily determined that there are at least three stages of gas charging,i.e.successively biogas,thermogenic hydrocarbon-rich gas and inorganic CO₂.The time of gas reservoiring is about 1.2 to 0.1 Ma.The diapiric faults that link up source rocks would have acted as good pathways for upward migration of natural gas.Episodic discharging of high-pressure fluids have induced the periodic opening and closing of diapiric faults,resulting in the mixing of gases from multiple sources and episodic accumulation of gases in the diapiric zone of Yinggehai basin.

Key words: natural gas, geochemical behaviors, episodic reservoiring, reservoiring time, Ledong gas field, Yinggehai basin

CLC Number:

TE112.113

Huang Baojia, Li Xushen, Yi Ping, Xiao Xianming. Geochemical behaviors and reservoiring history of natural gas in Ledong gas field in Yinggehai basin[J]. Oil & Gas Geology, 2005, 26(4): 524-529.

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Geochemical behaviors and reservoiring history of natural gas in Ledong gas field in Yinggehai basin

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