摘要
文安斜坡为霸县凹陷的东部缓坡,古近系东营组(Ed)河流沉积类型及展布一直存有争议。综合应用古地貌、物源补给、岩心相、测井相、平面相等分析方法对其进行了研究,认为东营组主要发育曲流河沉积,受"Y"字型断裂所形成的NE-SW向沟谷地貌所控制,2条近于平行的曲流河道呈NE-SW向延伸的弯曲条带展布,物源入口位于长丰镇和苏桥南地区。由砂体发育特征可分为河床亚相和河漫亚相。储层以河床亚相的河道充填和边滩微相砂体为主,其中,河道充填微相为大套泥岩夹薄层粉-细砂岩,具单个向上变细的正旋回;边滩微相为中-细砂岩与泥岩互层构成的复合正旋回,可见多个"二元层序"的纵向叠加。由下往上,曲流河向泛平原化发展,砂体数量减少且连通性变差。
Wen'an Slope was located in the east of Baxian Depression,there existed a dispute on the fluvial sedimentary types and distribution of the deposition in Dongying Formation.The methods of palaeo-geomorphology,source supply,core facies,log facies,plane facies were used,it was considered that meandering river sediments were developed in Dongying Formation,and it was controlled by NE-SW valley formed in 'Y' type fracture,two parallel meandering river channels with bending strip stretched in NE-SW direction,of which provenance entrance was located in Changfengzhen and Suqiaonan Areas.According to the characteristics of sand body,the meandering river sediment could be further divided to channel subfacies and flood-plain subfacies.Main reservoir was channel fill microfacies and point bar microfacies sandstone of channel subfacies.There was large set of mudstone intercalated with thin-layer powder-fine sandstone of channel filling microfacies with single fining-upward cycle.Point bar microfacies which was composed of medium-fine sandstone and mudstone constituted a composite positive-cycles,in which multiple binary sequence overlay existed vertically.From bottom to top,the meandering river gradually evolves to the panplanation.The number of sand body and communication are slowly reduced.
出处
《石油天然气学报》
CAS
CSCD
2012年第10期13-16,166,共4页
Journal of Oil and Gas Technology
关键词
曲流河
沉积相
东营组
文安斜坡
meandering river
sedimentary facies
Dongying Formation
Wen'an Slope
