辽河拗陷东部凹陷南部地区古近系沉积体系与储层评价

Sedimentary Systems and Reservoir Assessment of the Paleogene Systems of the Southern Part of Eastern Sag in Liaohe Depression

辽河拗陷位于郯庐断裂向北延伸的部位,该拗陷发育深水沉积,生油潜力大,储集层发育。李应暹(1997)利用辽河拗陷陆相遗迹化石对东部凹陷古近纪沉积环境做了分析。任作伟等(2003)对辽河拗陷沉积特征及砂体展布规律做了深入研究,认为沉积体系及沉积相决定东部凹陷深层储层的发育规模和储集性能,湖底扇中扇。

Detailed studies on a number of core sections,well logs and seismic data of the paleogene systems of the southern part of eastern sag in Liaohe Depression revealed that six sedimentary systems,i.e.delta,lake,fan delta,braided river,delta,river and alluvial fan,were distinguished. The sedimentation in the studied area remarkably controlled reservoir and the variability of sedimentary facies caused the diversity of reservoir sand bodies and the inhomogeneity of reservoir properties plane distribution:The best reservoir properties are the sand bodies of deltaic front and braided-river deltaic front;the better are the sand bodies of braided-river deltaic plain,deltaic front,braided river and meandering river;me medium reservoir properties are the sand bodies of delta plain,the fan-delta front,the alluvial-middle fan,beach-bar and turbidite fan;the worse are the sand bodies of upper fan and lower fan of alluvial fan,alluvial plain.The favorable sedimentary facies belt controlled the distribution of favorable reservoir and it was an important evidence for predicting favorable stratigraphic reservoir.