高邮凹陷阜一段低渗透储层特征及成因分析
网络出版日期: 2014-04-06
Characteristics and genesis of low permeability reservoir of the first member of Fuyi Formation in Gaoyou Sag
Online published: 2014-04-06
利用岩心、薄片和压汞等资料,通过统计、对比等方法得到苏北盆地高邮凹陷阜一段低渗透储层沉积相、岩石学和物性等特征以及储层低渗透的成因。 结果表明:阜一段储层主要为水下分流河道、河口坝砂岩储层,岩石类型以长石砂岩和长石岩屑砂岩为主,储层颗粒细、分选差、胶结物含量高,成分成熟度和结构成熟度低,整体上属于低孔、低渗储层;孔隙类型以粒间溶孔为主,其次为粒内溶孔、铸模孔,次生孔隙为阜一段储层的主要储集空间;沉积作用是导致储层低渗透的最基本因素,机械压实作用和胶结作用是导致储层低渗透的主要原因。 储层早期压实作用强,后期溶蚀作用相对较弱,晚期碳酸盐胶结较为发育,使得储层低渗透特征明显。
李专 , 何幼斌 , 肖彬 , 王振奇 . 高邮凹陷阜一段低渗透储层特征及成因分析[J]. 岩性油气藏, 2014 , 26(2) : 47 -53 . DOI: 10.3969/j.issn.1673-8926.2014.02.008
Based on the data of cores, thin sections and mercury penetration, this paper studied the characteristics of sedimentary facies, petrology, properties and genesis of low permeability reservoir of the first member of Fuyi Formation in Gaoyou Sag by using statistics and correlation method. The results show that the reservoir of the first member of Fuyi Formation formed in subaqueous distributary channel and mouth bar. The reservoir rock is mainly composed of fine grained feldspathic sandstone and feldspathic litharenite, they were poorly sorted, with high content of cements, and both the compositional maturity and textural maturity are low. The reservoir properties are poor, with low porosity and permeability. The pore types are mainly intergranular dissolved pores, followed by intragranular dissolved pores and mold pores. The main reservoir space is secondary pores. Deposition is the fundamental factor for causing the low permeability of the reservoir, and cementation and strong compaction are the main factors for the low permeability. Because of the strong cementation during the early formation of reservoir, relatively weak dissolution in later period and more developmental carbonate cementation during the late diagenetic stage, the characteristics of low permeability reservoir is significant.
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