古近系断裂控藏作用定量评价——以珠江口盆地陆丰13洼为例

Quantitative evaluation of fault-controls on hydrocarbon accumulation of Paleogene strata:a case study of Lufeng 13 subsag in Pearl River Mouth Basin

陆丰13洼古近系断裂多且复杂,不同断块内原油储量丰度差别较大,开展断裂控藏作用定量研究,厘清断裂与油气富集关系有利于更好地指导研究区下步油气勘探。从供油能力、输导能力、充注能力三个方面综合分析断裂的控藏作用,进行定量化表征,并建立了断裂控藏作用综合评价表征模型,应用证实,该模型中的耦合系数与油田储量丰度呈良好的线性关系,符合实际地质规律。在该定量评价方法的指导下于陆丰13洼发现了一个中型油田(C-9油田),进一步证实了该方法能够有效预测油气勘探的有利区域,可为富生烃断陷盆地古近系油气勘探提供借鉴。

There are many and complex faults in Paleogene strata,Lufeng 13 subsag.The oil enrichment degree in different fault blocks varies greatly.Quantitative research on the fault-controlled reservoir and the relationship between faults and oil enrichment is beneficial for future oil exploration in the study area.The fault-controls was comprehensively analyzed and quantified from three aspects:oil supply,transport and charging capacities.The coupling coefficient of fault-controlled reservoir was established.The coupling coefficient has a good linear relationship with the reserves abundance,which accords with the actual geological law.Under the guidance of quantitative evaluation,a medium-sized oil field(C-9) has been discovered.This method can predict the favorable areas and provide guidance for Paleogene strata with rich hydrocarbon generation.