【摘要】 南黄海盆地南五凹自白垩纪以来经历了4期构造运动,其中古近纪末期三垛运动最为强烈,造成大范围的剥蚀。结合井资料,综合利用泥页岩声波时差法、镜质体反射率Ro差值法,从点上对三垛组剥蚀量进行了恢复;然后依托二维地震剖面,利用地层趋势法对该期剥蚀量进行了区域成图。结果表明,该事件中南五凹最大剥蚀厚度在凹陷西部,一般为700~950 m;东部剥蚀厚度一般为300~500 m,整体剥蚀厚度小于新近系地层补偿厚度。三垛组剥蚀量的研究对认识南五凹的成藏史及油气分布规律具有重要意义。更多还原

【Abstract】 South V sag in South Yellow Sea Basin experienced four major tectonic activities since Cretaceous,among which Sanduo tectonic activity was the most intensive one that caused a wide range of erosions. Combined with the wells information,adopting the methods of acoustic time difference and vitrinite reflectance,the authors reconstructed the erosion thickness of Sanduo Formation. Afterwards,based on 2D seismic sections,erosion thickness map was completed with the method of stratum trend analysis. The research result indicated the maximum erosion thickness in the western South V sag was around 700 to 950 m,while the erosion in the eastern area was about 300 to 500 m. As a whole,the overall erosion thickness was less than the layer compensation thickness in Neogene System. The research of the erosion thickness in Sanduo Formation played an important role in recognizing the law of hydrocarbon accumulation and distribution in South V sag.更多还原