摘要
综合利用286口探井的岩心、录井及测井资料,通过详细的沉积学分析,查明了松辽盆地北部西斜坡嫩江组一段发育的砂体是湖底扇。嫩江组一段S1砂组沉积时期,湖岸线在盆缘坡折附近波动时,受盆缘陡坡的控制,在西部斜坡形成了分布较为广泛的湖底扇。这种湖底扇的沉积特征是砂岩层夹在厚层暗色泥岩中,上下均呈突变接触关系。单层厚度大于2m的厚层砂体在平面上沿直线呈串珠状分布,为碎屑流成因;薄层砂体在平面上呈朵状分布,为浊流成因。
The data of cores,log and well logging of 286 wells were integrally used,through sedimentology analysis in detail,it was clarified that the sand bodies in K2n1 S1 Sand Group in the west slope of Northern Songliao Basin were caused by lake-floor-fan.During its depositional period,the lake-shore-line is fluctuated near the slope break of the basin margin,and it is controlled by the margin steep slope,the wide distribution of lake-floor-fan is formed in west slope.The depositional characteristics of the sandstones are the interlayers in darkness mudstones,and the bottom and top surfaces are sharply changed,thicker sandstones(more than 2m) are distributed in shape of string of beads,which is the genesis of debris flow,and the thinner sand bodies are distributed in shape of large lobe,which is formed by turbidity flow.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2011年第6期11-15,5,共5页
Journal of Oil and Gas Technology
基金
国家自然科学基金项目(40272057)
