Abstract: Oil and gas enrichment area in basins offshore China are controlled by rich hydrocarbongenerating Paleogene depression. Relating with large drape anticline,accompanied by largedelta sandstone reservoir or large biohermal carbonate reservoir and areal distribution of regional cap rock,large oil and gas fields could usually be formed.In continental deposit,oiland gas reservoirs are usually close to the source area.In marine sequences,if there are favorable carrier bed and areal cap rock,oil could migrate to a long distance,and can form oilreservoirs from distant source areas.Coal measure units of the Paleogene spread in a largearea offshore China with abundant coal-generating gas potential.In west of South China Seathe Paleogene marine formations are very thick with fast depositional rate,high geothermalgradient,also has favorable gas-generating capacity.

Key words: China, continental shelf basin, reservoir enrichment zone, hydrocarbon evolution, coal-derive gas, evaluation of oil-gas resources

摘要： 中国沿海大陆架盆地油气富集区,受下第三系富生油凹陷控制,与其相联系的大型披复背斜,配以大型三角洲砂岩体或大型生物礁滩灰岩储层,及大面积分布的区域盖层,往往形成大油气田.油气田在陆州沉积中近烃源区分布,在海相地层中有良好运载层及大面积顶盖层的条件下,石油可长距离运移,在远离油源区也可形成油田.下第三系煤系地层在大陆架大面积分布,具有雄厚的煤成气潜力.南海西部有巨厚上第三系海相地层,沉积速度快,地温梯度高,也有优越的成气条件.

关键词: 中国, 大陆架盆地, 油气富集区, 烃类演化, 煤成气, 油气资源评价