对下刚果盆地Haute Mer A区块X-1井3个原油样品及X-1井、M-1井上白垩统、古近系共14个岩屑样品进行详细的分析研究,其结果表明X-1井原油生物标志化合物组合特征与南大西洋典型湖相烃源岩具有明显区别。X-1井原油(1982.1~1989.2m)Pr/Ph...对下刚果盆地Haute Mer A区块X-1井3个原油样品及X-1井、M-1井上白垩统、古近系共14个岩屑样品进行详细的分析研究,其结果表明X-1井原油生物标志化合物组合特征与南大西洋典型湖相烃源岩具有明显区别。X-1井原油(1982.1~1989.2m)Pr/Ph比值低(0.97),Pr/n C_(17)和Ph/n C18分别为0.85和0.96,C_(26)/C_(25)三环萜烷小于1.0,C_(30)四环聚异戊二烯烷烃/C_(27)重排甾烷比值低(0.55),具有海相烃源岩特征。原油中奥利烷丰度高,指示其来自上白垩统或以上的烃源岩。油源对比表明X-1井原油与上白垩统—始新统Madingo组烃源岩具有成因上的联系。盆地模拟研究进一步证明中新统Paloukou组烃源岩局部成熟,供烃能力有限;而Madingo组烃源岩目前正处于生、排烃高峰期,沉积中心则处于高—过成熟阶段,X-1井紧临Madingo组生烃洼陷,有利于油气聚集成藏。因此,推断Madingo组烃源岩为X-1井原油的主要贡献者。展开更多
Natural gases discovered up to now in Lishui Sag,the East China Sea Basin,differ greatly in gaseous compositions,of which hydrocarbon gases amount to 2%―94%while non-hydrocarbon gases are dominated by CO2.Their hydro...Natural gases discovered up to now in Lishui Sag,the East China Sea Basin,differ greatly in gaseous compositions,of which hydrocarbon gases amount to 2%―94%while non-hydrocarbon gases are dominated by CO2.Their hydrocarbon gases,without exception,contain less than 90%of methane and over 10%of C2 + heavier hydrocarbons,indicating a wet gas.Carbon isotopic analyses on these hydrocarbon gases showed thatδ13C 1 ,δ13C 2 andδ13C 3 are basically lighter than-44‰,-29‰and-26‰, respectively.The difference in carbon isotopic values between methane and ethane is great,suggesting a biogenic oil-type gas produced by the mixed organic matter at peak generation.δ13C CO2 values of nonhydrocarbon gases are all heavier than-10‰,indicating a typical abiogenic gas.The simulation experiment on hydrocarbon generation of organic matter in a closed gold-tube system showed that the proportion of methane in natural gases produced by terrigenous organic matter in the Lingfeng Formation marine deposit is obviously higher than that in natural gases derived from the aquatic and terrigenous mixed organic matter in the Yueguifeng Formation lacustrine deposit,consequently the proportion of heavier hydrocarbons of the former is remarkably lower than that of the latter.Moreover, δ13C 1 values of natural gases produced by terrigenous organic matter in the Lingfeng Formation marine deposit are about 5‰heavier than those of natural gases derived from the aquatic and terrigenous mixed organic matter in the Yueguifeng Formation lacustrine deposit whileδ13C 2 andδ13C 3 values of the former are over 9‰heavier than those of the latter.Currently the LS36-1 oil-gas pool is the only commercial oil-gas reservoir in Lishui Sag,where carbon isotopic compositions of various hydrocarbon components differ greatly from those of natural gases produced by the Lingfeng Formation organic matter but are very similar to those of natural gases derived from the Yueguifeng Formation organic matter,therefore,natural gases in the LS36-1 oil-gas pool are mainly derived from the Yueguifeng Formation lacustrine source rock rather than the Lingfeng Formation marine or Mingyuefeng Formation coal-measures source rocks.展开更多
文摘对下刚果盆地Haute Mer A区块X-1井3个原油样品及X-1井、M-1井上白垩统、古近系共14个岩屑样品进行详细的分析研究,其结果表明X-1井原油生物标志化合物组合特征与南大西洋典型湖相烃源岩具有明显区别。X-1井原油(1982.1~1989.2m)Pr/Ph比值低(0.97),Pr/n C_(17)和Ph/n C18分别为0.85和0.96,C_(26)/C_(25)三环萜烷小于1.0,C_(30)四环聚异戊二烯烷烃/C_(27)重排甾烷比值低(0.55),具有海相烃源岩特征。原油中奥利烷丰度高,指示其来自上白垩统或以上的烃源岩。油源对比表明X-1井原油与上白垩统—始新统Madingo组烃源岩具有成因上的联系。盆地模拟研究进一步证明中新统Paloukou组烃源岩局部成熟,供烃能力有限;而Madingo组烃源岩目前正处于生、排烃高峰期,沉积中心则处于高—过成熟阶段,X-1井紧临Madingo组生烃洼陷,有利于油气聚集成藏。因此,推断Madingo组烃源岩为X-1井原油的主要贡献者。
基金the Research Project of CNOOC(Grant No.CT/04-EXP-009)
文摘Natural gases discovered up to now in Lishui Sag,the East China Sea Basin,differ greatly in gaseous compositions,of which hydrocarbon gases amount to 2%―94%while non-hydrocarbon gases are dominated by CO2.Their hydrocarbon gases,without exception,contain less than 90%of methane and over 10%of C2 + heavier hydrocarbons,indicating a wet gas.Carbon isotopic analyses on these hydrocarbon gases showed thatδ13C 1 ,δ13C 2 andδ13C 3 are basically lighter than-44‰,-29‰and-26‰, respectively.The difference in carbon isotopic values between methane and ethane is great,suggesting a biogenic oil-type gas produced by the mixed organic matter at peak generation.δ13C CO2 values of nonhydrocarbon gases are all heavier than-10‰,indicating a typical abiogenic gas.The simulation experiment on hydrocarbon generation of organic matter in a closed gold-tube system showed that the proportion of methane in natural gases produced by terrigenous organic matter in the Lingfeng Formation marine deposit is obviously higher than that in natural gases derived from the aquatic and terrigenous mixed organic matter in the Yueguifeng Formation lacustrine deposit,consequently the proportion of heavier hydrocarbons of the former is remarkably lower than that of the latter.Moreover, δ13C 1 values of natural gases produced by terrigenous organic matter in the Lingfeng Formation marine deposit are about 5‰heavier than those of natural gases derived from the aquatic and terrigenous mixed organic matter in the Yueguifeng Formation lacustrine deposit whileδ13C 2 andδ13C 3 values of the former are over 9‰heavier than those of the latter.Currently the LS36-1 oil-gas pool is the only commercial oil-gas reservoir in Lishui Sag,where carbon isotopic compositions of various hydrocarbon components differ greatly from those of natural gases produced by the Lingfeng Formation organic matter but are very similar to those of natural gases derived from the Yueguifeng Formation organic matter,therefore,natural gases in the LS36-1 oil-gas pool are mainly derived from the Yueguifeng Formation lacustrine source rock rather than the Lingfeng Formation marine or Mingyuefeng Formation coal-measures source rocks.
