关键词: Bohai Bay basin, Nanpu sag, Laoyemiao structure, fault-sand configuration, hydrocarbon transporting, time effectiveness, research method

Abstract: In order to study the distribution of hydrocarbon which was generated in the lower source rocks and accumulated in the upper reservoirs in the source-reservoir-caprock combinations of a petroliferous basin, aiming at the time effectiveness of fault-sand configuration transporting hydrocarbon currently, and based on the determination of fault transporting- and sand transporting-hydrocarbon time, the time of fault-sand configuration transporting hydrocarbon is determined. Then compared with the hydrocarbon expulsion peak time, the paper establishes a method to study the time effectiveness of fault-sand transporting hydrocarbon and applies the method in Ed2 and Ed3 reservoirs in the Laoyemiao structure of the Nanpu sag. The study results show that the fault-sand transporting hydrocarbon time of Ed2 and Ed3 reservoirs in the Laoyemiao structure should be the deposition period of the upper Minghuazhen formation, later than the first hydrocarbon expulsion peak (middle deposition period of Guantao formation) of the source rocks of Es3 and Es1, which was not conducive to the hydrocarbon migration in this first peak period. However, the time of fault-sand configuration transporting hydrocarbon was slightly later than the second hydrocarbon expulsion peak (late deposition period of the lower Minghuazhen formation) of the source rock of the Es3 and Es1 and a certain amount of hydrocarbon could be transported, which was good for hydrocarbon accumulation. The results are consistent with the distribution of the hydrocarbon discovered in Ed2 and Ed3, which shows that the method is feasible to be used in time effectiveness research of the fault-sand configuration transporting hydrocarbon.

Key words: Bohai Bay basin, Nanpu sag, Laoyemiao structure, fault-sand configuration, hydrocarbon transporting, time effectiveness, research method