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根据歧口凹陷滨海断鼻沙三段油气包裹体特征及地层埋藏史的恢复,确定了研究区油气成藏期次和成藏时间,认为沙三段油气以晚期成藏为主,其中Qs1井为多次非连续充注2期成藏(早期和晚期)。结合构造活动特征、生排烃演化史及油气运聚史对油气成藏史进行了分析,认为沙三段油气藏分布主要受生烃演化阶段与构造发育配置关系的控制,并形成了“高油低气”的分布特征,研究区沙三段是寻找大气田的有利区域。
According to the characteristics of oil-gas inclusions and the recovery of burial history of buried strata in the seashore of Qikou sag, the hydrocarbon accumulation period and hydrocarbon accumulation time of the study area were determined. For multiple non-continuous filling 2 period accumulation (early and late). According to the characteristics of tectonic activities, the evolutionary history of hydrocarbon generation and expulsion and the hydrocarbon migration and accumulation history, the hydrocarbon accumulation history is analyzed. It is concluded that the distribution of the Es3 oil and gas reservoirs is mainly controlled by the relationship between the hydrocarbon evolution stage and the tectonic development and configuration, High-oil and low-gas "distribution. The third member of Shahejie of the study area is a favorable area for searching for large gas fields.