【摘要】 探讨东海陆架盆地西湖凹陷平湖斜坡带不同油区的油气分布成因。在针对平湖斜坡带油、气关系梳理的基础上,利用原油物性、轻烃、饱和烃等有机地球化学参数与油藏特征对油气分布成因进行分析。结果表明靠近生烃洼陷的低带晚期干气充注程度高,具有高气油比、低含油的凝析气藏特征;中带充注程度低,表现下部为凝析气、上部为早期原油的特征;高带表现纯油藏或少量天然气的油藏特征。平湖斜坡带在早期生油的基础上,晚期干气对平湖组底部早期形成的油藏进行气侵,而受控于输导体发育的差异,不同区带及不同构造受到的气侵程度不同,形成了现今复杂的油气分布关系。更多还原

【Abstract】 Organic geochemical parameters, such as physical properties of crude oil, light hydrocarbons, saturated hydrocarbons, in combination with the reservoir characteristics, are used to analyze the complicated hydrocarbon distribution mechanism in different zones on the Pinghu Slope of Xihu Sag in the East China Sea shelf basin. The results show that the filling degree of later dry gas in the lower zone near the hydrocarbon-generating sag is high, characteristic of high gas-oil ratio for the condensate gas reservoir and low condensate oil content; the middle zone is in low filling degree, characterized by condensate gas in the lower part and early crude oil in the upper part; and the high zone is characterized by pure oil reservoir or a small amount of natural gas reservoir. Based on the early oil generation and comprehensive study, it is revealed the late dry gas invaded the early-formed reservoirs at the bottom of Pinghu Formation on the Pinghu Slope. Due to the differences in the development of transport conductors, different degrees of gas developed in different zones and structures and formed complex oil-gas relation.更多还原