摘要
苏北盆地高邮凹陷古近系阜宁组(E1f)碎屑岩成岩演化阶段处于早成岩B期至晚成岩B期。通过成岩阶段的划分、砂体微相展布和砂体厚度、埋藏深度以及成岩类型等方面进行分析和研究,高邮凹陷阜宁组砂岩可以划分为七种成岩相:弱胶结弱溶解成岩相、碳酸盐胶结溶解成岩相、碳酸盐胶结交代成岩相、不稳定碎屑组分溶解成岩相、石英长石加大成岩相、较强胶结弱溶解成岩相和粘土杂基支撑的成岩相。其中弱胶结弱溶解成岩相、碳酸盐溶解胶结成岩相和不稳定碎屑组分溶解成岩相是阜宁组砂岩原生与次生孔隙发育,储集条件较好的相区。因此,编制阜宁组各亚段不同成岩相的分区图,对于在高邮凹陷中埋藏较深的区域寻找和预测有利次生孔隙发育区带的分布具有重要意义。
The sandrock of Paleogene Funing Group in the Gaoyou sag of Subei basin is the main reservoir. The reservoir rock diagenetic evolution period is between early diagenetic period B and late diagenetic period A. Based on the analyses and research of dividing diagenetic periods and types, exhibition of sandbodies microfacies and thickness, this paper studies the diagenetic facies and their characteristics. The diagenetic facies of the Funing Group in Gaoyou sag can be divided into seven types： weak cemented and weak dissolved diagenetic facies, carbonate cement and dissolution diagenetic facies, unsteady petroclastic constituent dissolution diagenetic facies, carbonate cement and metasomatism diagenetic facies, quartz and feldspar overgrowth diagenetic facies, strong cemented and weak dissolved diagenetic facies, clay complex matrix supported diagenetic facies. In these diagenetic facies, the weak cemented and weak dissolved diagenetic facies, the carbonate cement and dissolution diagenetic facies and the unsteady petroclastic constituent dissolution diagenetic facies have the best reservoir conditions. Therefore, to establish the diagenetic facies zoning maps of the Funing subgroup in Gaoyou sag is significant for exploring and forecasting the beneficial secondary pore zone in the deep area of the Gaoyou sag.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第3期225-231,共7页
Journal of Chengdu University of Technology: Science & Technology Edition
关键词
苏北盆地
高邮凹陷
阜宁组
成岩相
次生孔隙
Subei basin
Gaoyou sag
Funing Formation
diagenetic facies
secondary pore
