长岭凹陷北葡萄花油层沉积特征及地质意义

Sedimentary Characteristics and Their Petroleum Geological Significance of the Putaohua Reservoir in the North of the Changling Depression

长岭凹陷北部是松辽盆地姚家组沉积期沉降中心,长期的油气勘探一直认为其为松辽盆地的深湖发育区,通过对长岭凹陷北部钻井、测井、岩心、古生物等研究认为该区域发育了受北部物源控制的三角洲前缘亚相的水下分支河道和叠置席状砂微相。在详细研究长岭凹陷北部葡萄花油层的沉积特征后,总结了各砂组沉积微相平面展布,要向上具有水退序列→水进序列的沉积演化特征,葡萄花油层中部为最大水退期,进一步发现,分布在新立地区、新民地区的叠置席状砂体展布规模大,具有巨大的勘探前景。

Long-term oil and gas exploration indicates that the north of the Changling depression in the Songliao basin is the subsidence center in the Yaojia sedimentary period and considered to be a deep lake development zone of the Songliao basin. The analysis of drilling, logging, core, paleontology and so on shows that this area belongs to delta-front facies controlled by northern provenance,including the distributary channel and the superimposed sheet sand. Study of sedimentary characteristics of the Putaohua reservoir and planar distribution of sedimentary microfacies for various sand groups indicates superimposed sheet sandbodies in Xinli and Xinmin areas are of great importance to oil-gas exploration prospect.