东海陆架盆地长江凹陷生油岩研究

The Study on Source Rock of Changjiang Sag of the East China Sea Shelf Basin

长江凹陷沉积层巨厚 ,最大达 880 0m ,古近系以湖相沉积为主的暗色泥岩发育 ,具有良好的生烃条件 ,有机质丰度中 -较高 ,有机质类型以Ⅲ型为主 ,生油岩大部分处于生油高峰期。大观园深凹为长江凹陷主要的生烃中心 ,面积为 675 8.75km2 ,有效生油岩厚度大 ,分布面积广 ,新生代最大沉积厚度超过 5 0 0 0m ,生烃量为 7.2 1 9× 1 0 8t ,油气资源量为 1 .674× 1 0 8t ,且局部构造发育 ,最具油气勘探前景。

Changjiang Sag has huge sedimentary deposit, the maximal thickness is 8800m, dark mudstone of lacustrine deposit predominate Tertiary, having good generating conditions. The abundance of organic matter is mid-high and the types is Ⅲ. Most source rock belong to innacle phase. The main generating hydrocarbon center of Changjing Sag is Daguanyuan deep sag, the area is 6758.75km 2, available source rock is big, covering vast area, the maximal sedimentary thickness of Cenozoic is over 5000m, the amount of generating hydrocarbon is 7.219×10 8t, the amount of oil-gas resource is 1.674×10 8t, many tectonic in there, and it is good prospective area in Changjiang Sag.