论成岩圈闭在苏北盆地存在的可能性

在了解储层特征的基础上，利用开发井采油、采液强度代表储层物性来规避取心资料稀少与测井资料不全的问题，通过解剖高邮凹陷阜一段的多个油藏，论证了苏北盆地存在成岩圈闭的可能。分析认为，在高邮凹陷中深层的阜一段低渗透储层中，由于酸性流体来自上覆的阜二段，自深向浅运移，导致在运移的主通道上存在以酸性流体溶蚀产生的次生孔隙为主的储集砂体，而在高部位与边缘则存在由碳酸盐胶结导致砂体致密的封闭条件。对比发现，成岩作用强烈的阜一段的多个油藏具有储层物性与构造及沉积相关性不大的成岩圈闭特征，而沉积相控特征明显的阜三段油藏则没有这种特征。因此，在苏北盆地深层阜一段很可能存在“成岩圈闭”型油藏，对勘探程度较高的苏北盆地及我国东部探区的下一步深化勘探具有重要意义。

The possibility of diagenetic traps in Jiangsu Oilfield

Based on the understanding of reservoir characteristics,the possibility of diagenetic traps in Jiangsu Oilfield was demonstrated by anatomizing some reservoirs of the first member of Funing Formation(E1f1) in Gaoyou Depression.In this process,the oil and fluid producing intensity of development wells were used as representing the reservoir properties to circumvent the problem of scarce coring data and incomplete logging data.In the low permeability reservoir of deep E1f1,the induced porosity sand bodies on the main migration channel were formed by acidic fluid migrating from deep to shallow which was came from the overlying second member of Funing Formation(E1f2).In the higher and edge parts of channel,the dense sand bodies were caused by carbonate cementation.By comparison,some reservoirs of strong diagenetic E1f1 had diagenetic trap characteristics,which mean scarce relationship between the reservoir properties and structure or deposition.But,the reservoirs of the third member of Funing Formation(E1f3) hadn’t this character which is controlled by sedimentary facies.Consequently,the diagenetic trap reservoirs were existed in Jiangsu Oilfield in all probability,and this might extend the areas of exploration.