摘要
盐城凹陷天然气中甲烷含量高 ,碳同位素具有正分布系列 ,主体具有高成熟腐泥型气特征 ,伴随产出的凝析油则体现出与本区湖相原油和海相原油既相似又相区别的特征。不同组分间存在成熟度差异 ,轻质组分反映高成熟 ,中等组分体现出未熟—低熟 ,重质组分表现出成熟特征。母源分析对比表明天然气与凝析油主要源自古生界海相腐泥型源岩 ,混有泰州组少许贡献 。
Natural gas of Yancheng petroleum reservoir was characterized by high content of methane and normal carbon distribution of carbon isotope. The natural gas has multiple source origins with oil-type pyrolysis gas dominating. Condensate showed associated with natural gas suggested both similarity to and difference from lacustrine and marine oils. Maturity differentiates among different compositions. Light compositions of condensate showed high maturity, while middle compositions were immature to low mature and heavy compositions were mature. Source analysis indicated that natural gas and condensate mainly came from Paleozoic marine sapropelic material, partly from the Taizhou formation. Composition differences and maturity variations were due to migration fractionation induced by mass gas charge matching with long-term-developed extensional faults and mixture of hydrocarbons with different maturities.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2004年第4期95-100,共6页
Marine Geology & Quaternary Geology
基金
国家攀登计划地质流体项目 ( 95 预 3 9 3 )
