长岭凹陷前七号地区青山口组沉积相研究

Study on sedimentary facies for Qingshankou Formation in Qianqihao Area of Changling Sag in Songliao Basin

当钻井资料较少时,以岩心、测井等资料为补充地震属性分析,能较好地对沉积相展布进行研究。利用地质、测井、地震等资料,对松辽盆地南部长岭凹陷前七号地区青山口组沉积相进行综合研究,确认其为三角洲相沉积,并可进一步划分为三角洲平原亚相(发育分流河道、分流河道间、天然堤、决口扇等微相)和三角洲前缘亚相(发育水下分流河道、分支间湾、河口坝、远砂坝、前缘席状砂等微相)。通过绘制沉积微相平面分布图,建立该区青山口组沉积模式,为有利勘探区研究提供了依据。

When drilling data is limited,the coring and logging data can be used to supplement seismic attribute analysis for the study of sedimentary facies. The sedimentary facies in Qingshankou Formation of Qianqihao Area,Changling Sag,the south of Songliao Basin has been comprehensively studied by using coring,logging and seismic data. It has been defined to be delta facies,which is further classified into two subfacies of delta plain and delta front. The delta plain subfacies consists of distributary channel,interdistributary channel,natural levee and splay. The delta front subfacies consists of underwater distributary channel,interdistributary bay,mouth bar,distal bar and front sheet sand. The distribution of sedimentary microfacies has been mapped for Qingshankou Formation to build its depositional model and to provide basis for exploration.