泌阳凹陷安棚油田深层系沉积相及对油气分布的控制作用

Sedimentary facies of deep sequences of Anpeng Oilfield in Biyang Depression and its control over oil-gas distribution

以安棚油田深层系岩心分析资料及大量测井、录井、生产动态资料为基础,通过各类沉积相标志分析,研究了安棚油田深层系储集层的沉积相类型及沉积相特征,认为该区深层系为近源扇三角洲沉积,并将其划分为上扇、中扇、下扇、扇缘,扇外为半深湖深湖,并建立了深层系扇三角洲沉积模式。在此基础上,对沉积相与油气分布关系进行分析,结果表明,不同沉积相带物性及含油气性差异明显,中扇物性好,是油气聚集的有利相带;下扇、扇缘等微相相对较差。

This paper discussed the sedimentary facies type and the characteristics of deep sequences of the Anpeng oilfield on the basis of drilling core studies and analyses of logging, recording and production dynamic data. Analytical results show that Anpeng deep sequences belong to near-source fan-deltaic deposits. Certain microfacies can be further determined and they include upper, middle, lower and marginal fans, suggesting a sedimentary model in relation to the fan-delta environment of deep sequences. In addition, the correlation between sedimentary facies and oil-gas distribution was recognized to have been related to the physical property of reservoirs. Specifically, the middle fan with a good physical property tends to be a favorable site for oil-gas accumulation, whereas in respect of lower and marginal fans this capability is relatively limited.