长岭凹陷腰英台油田腰西区块青山口组储层沉积微相研究

通过对松辽盆地长岭凹陷腰英台油田腰西区块大量钻井岩心、测井资料研究,结合地震精细解释,以沉积学理论为指导,划分了青山口组沉积相类型,建立了沉积亚相、微相,进而对青一Ⅱ、青二Ⅳ层的15个砂体,单层厚度2~4m的小层进行了精细刻画,形成了各个砂体的沉积微相展布特征。青一段和青二Ⅳ段储层沉积微相主要为三角洲前缘水下分支河道,少量河口坝;各小层河道交错叠置,但河道宽仅200~300m。小层沉积微相研究对油田开发井网部署及提高储量动用效果具有重要的指导作用。

Sedimentary microfacies of Qingshankou Formaiton, West-Yao block, Yaoyingtai Oil Field, Changling Sag, Songliao Basin

Based on the studies of core samples and well-logging data from the West-Yao block of the Yaoyingtai Oil Field in the Changling Sag of the Songliao Basin,combined with seismic fine interpretation,guided by sedimentary theory,the types of sedimentary facies of the Qingshankou Formaiton were classified,and the subfacies and microfacies were also divided.15 sandbodies(2-4 m thick each layer) from Q1-Ⅱ and Q2-Ⅳ were described,and the division characteristics of sedimentary microfacies of each sandbody were concluded.The sedimentary microfacies of Q1 and Q2-Ⅳ reservoirs are mainly underwater distributed channels in delta front,and debouch bar was less popular.Channels in each layer overlap each other,yet the channel width is only 200-300 m.The studies of sedimentary microfacies of thin layers are significant for oilfield well arrangement and development performance improvement.