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平湖构造带是东海西湖凹陷的一个次级构造单元,是油气勘探的重点区域之一。应用流体包裹体及碳同位素组成等研究了构造带内的油气运聚特征,并与凹陷内的另一个主要油气聚集带———浙东中央背斜带的油气运聚特征进行对比。研究表明,平湖构造带经历了2期油气充注过程,其中第1期主要充注液态烃,第2期主要充注气态烃,充注时间相对较晚,且第1期古地温低于第2期;构造带内油气运移以侧向运移为主,该区是有利的油气运移指向区。
Pinghu structural belt is a secondary structural unit in the Xihu sag of the East China Sea and is one of the key areas for oil and gas exploration. By using fluid inclusions and carbon isotopic compositions, the hydrocarbon migration and accumulation characteristics in the structural belt have been studied and compared with the hydrocarbon migration and accumulation characteristics of the eastern Zhejiang central anticline, another major oil and gas accumulation belt in the depression. The results show that the Pinghu structural belt experienced two stages of oil and gas filling process, of which the first stage is mainly filled with liquid hydrocarbons, the second stage is mainly charged with gaseous hydrocarbons, the charging time is relatively late, and the first stage paleo-earth temperature is lower than the first stage 2 period. The main migration of oil and gas in the structural belt is lateral migration, which is a favorable point for hydrocarbon migration.