【摘要】 为分析莺歌海盆地中央凹陷带天然气成藏条件与聚集规律,利用钻井、测井资料、地震资料及地球化学资料,对莺歌海盆地的生、储、盖及温压和构造特征进行研究,分析不同地区天然气的成藏条件和成藏模式,并划分成藏有利区。研究结果表明:烃源岩大量排烃期晚是天然气成藏的基础,超压条件下的高孔隙度储层是天然气成藏的有利场所,巨厚超压的盖层有利于天然气保存。超压环境下天然气以垂向运移为主,莺歌海盆地中央凹陷带可分为底辟区混相快速排放成藏模式和非底辟区剩余压差条件下水溶气成藏模式。天然气成藏有利区都集中在盆地中心的DF区及LD区内,这2个地区成为天然气勘探重点。更多还原

【Abstract】 In order to investigate accumulation conditions and rules of natural gas in central sag zone of Yinggehai basin,drilling,data,logging data,seismic data and geochemical data had been used to do research in hydrocarbon generation,reservoir,cap rock,temperature,pressure and structure characteristics,and analyze different areas’ accumulation conditions,accumulation patterns and favorable areas of natural gas.Result shows that: the period of a large amount of gas expulsion late is the basis of natural gas’ accumulation,the high porosity reservoir in overpressure environment is natural gas’ favorable accumulation place,thick cap rocks with overpressure is benefitial for natural gas saving.Natural gas has mainly vertical migration in the overpressure environment.In central sag zone of Yinggehai basin,there are two patterns for natural gas: miscible migration and quick expulsion pattern in diapiric area and the water-gas isolate pattern by pressure difference in non-diapiric area.Favorable areas can be found in Yinggehai basin.They are all located in DF and LD areas in the centre of the basin.These areas will be the focus of gas prospecting.更多还原