上覆不同储盖组合油源断裂输导油气时期厘定方法及其应用

为研究含油气盆地油源断裂带附近不同储盖组合的油气富集规律，在上覆不同储盖组合油源断裂输导油气时期研究的基础上，通过确定油源断裂活动时期、源岩排烃时期和区域性泥岩盖层渗漏时期，组合三者建立了一套上覆不同储盖组合油源断裂输导油气时期的厘定方法。实例应用结果表明：渤海湾盆地歧口凹陷上覆沙一下亚段储盖组合南大港断裂输导油气时期为馆陶组至明化镇组沉积时期，有利于油气在沙一下亚段聚集成藏；上覆东三段储盖组合南大港断裂输导油气时期为明化镇组沉积中期至末期，不利于油气在东三段聚集成藏；上覆馆陶组储盖组合南大港断裂输导油气时期为零，无油气在馆陶组聚集成藏。这与南大港断裂附近目前已发现油气在沙一下亚段相对较多，东三段相对较少和馆陶组无相吻合，表明该方法用于厘定上覆不同储盖组合油源断裂输导油气时期是可行的。

Determination method of hydrocarbon transport time of overlying combination of different reservoir-cap assemblages by oil source faults and its application

In order to study the accumulation law of oil and gas near the oil source fault zone of different reservoir-cap assemblages in petroliferous basins， a set of determination methods of the period when the oil source fault transported oil and gas to overlying different reservoir-cap assemblages was established. The method was derived based on the study of the period when the oil source fault transported oil and gas to overlying different reservoir-cap assemblages， and by coupling the active period of oil source fault， hydrocarbon expulsion period of source rock and leakage period of regional mudstone caprock. The example application results show that the period when the Nandagang Fault transported oil and gas to the lower sub-member of the 1^st member of Shahejie Formation （Es₁） reservoir-cap assemblage is the sedimentary period from Guantao Formation （Ng） to Minghuazhen Formation （Nm）， which is conducive to the accumulation of oil and gas in the lower sub-member of Es₁； the period when the Nandagang Fault transported oil and gas to the 3^rd member of Dongying Formation （Ed₃）reservoir-cap assemblage is from the middle to the end of the deposition of Nm， which is not conducive to the accumulation of oil and gas in Ed₃；the period when the Nandagang Fault transported oil and gas to the Ng reservoir-cap assemblage is zero， and no oil and gas accumulated in Ng. The results are coincident with the fact that oil and gas have been found in the lower sub-member of Es₁， less in the Ed₃ and not in the Ng， suggesting that the method is feasible for application in the determination of the period when the oil source fault transported oil and gas to overlying different reservoir-cap assemblages.