东海陆架盆地油气资源勘探现状及含油气远景

东海陆架盆地是中国近海面积最大的中、新生代沉积盆地 ,有效勘探面积 2 4× 10 4 km2 ,最大沉积厚度 15 0 0 0m ,油气资源十分丰富 ,但目前勘探程度低 ,油气资源开发尚处在起步阶段。东海陆架盆地的油气发现主要集中在西湖凹陷和丽水凹陷。西湖凹陷局部构造条件优越 ,发育 3套烃源岩 (平湖组为主力烃源岩 ) ,下第三系多旋回沉积形成了良好的储盖组合 ,具有好的含油气远景 ;西斜坡断阶带和南部中央构造带是西湖凹陷最有利的油气成藏区带。丽水凹陷发育 2套烃源岩 (下古新统月桂峰组是主力烃源岩 ) ,古新统储盖组合发育良好 ,存在古新统含油气系统和古新统 始新统复合含油气系统 ,具有相当大的油气资源潜力和好的勘探前景 ;丽水西次凹南部邻近凹陷中心且与断裂分布有关的构造带以及凹陷北部的西斜坡带是丽水凹陷最有利的油气聚集区带

EXPLORATION STATUS AND PERSPECTIVE OF PETROLEUM RESOURCES IN EAST CHINA SEA SHELF BASIN

East China Sea shelf basin, with an effective exploration area of 240,000km 2 and a maximum sediment thickness over 15km, is the biggest Meso_Cenozoic basin offshore China. There are rich petroleum resources in the basin, but their development is still in a beginning stage due to immature exploration. Now the petroleum discoveries are mainly in Xihu and Lishui sags. Xihu sag has a good petroleum perspective because of excellent local structures, 3 sets of source rocks (the main ones are in Pinghu Formation) and excellent reservoir_seal assemblages in Paleogene multi_cycle deposits. The best plays in Xihu sag are the fault terrace zone on the west slope and the south part of the central structure zone. For Lishui sag, there are substantial resources potential and a good exploration perspective because of 2 sets of source rocks (the main ones are in Lower Paleocene Yueguifeng Formation), a well?developed Paleocene reservoir_seal assemblage, a Paleocene petroleum system and a Paleocene_Eocene petroleum system. The best plays in Lishui sag may be the structure zone in the southern part of west sub_sag that is related to faults and adjacent to the sag center, and the west slope in the northern sag.