孤岛油田馆陶组湖相沉积认识及应用

THE RECOGNITION AND APPLICATION OF LACUSTRINE FACIES IN GUANTAO FORMATION OF GUDAO OILFIELD

济阳拗陷新近系馆陶组普遍发育河流相的观念由来已久,研究中重点通过连续取芯井的岩芯观察,以及综合利用录井、测井、古生物及相关分析化验资料,运用沉积学理论,丰富和发展了原有孤岛油田馆陶组仅仅普遍发育河流相的沉积观点,认为馆陶组下段不仅发育砾质辫状河沉积,还发育辫状河三角洲—充填型浅水湖泊沉积体系;馆陶组上段初期发育辫状河、曲流河等河流相沉积,中晚期发育浅水三角洲—氧化型浅水湖泊以及浅水振荡湖泊沉积体系。湖相沉积模式在与油田生产密切相关的小层对比和油气勘探中的应用广泛。

The viewpoint that Guantao Formation of Neogene in Jiyang depression developed alluvial facies has been for a long time,in this research,by means of core observation from continuous coring wells and such analytical information as well data,well logging and paleontology,as well as the application of sedimentology theory,the sedimentary viewpoint that the formation developed only alluvial facies is nodified and enriched,it is recognized that at the lower section of the formation develops not only rudaceous braided river sedimentation,also braided river delta-infilling shallow lacustrine sedimentary system,at the begining of late Guantao period developed,braided and meandering river deposition developed,and at the mid-late stage of the late period,shallow water delta-oxidizing shallow water lacustrine and shallow oscillating lacustrine depositional system developed.In beds correlation and hydrocarbon exploration tightly related to oilfield production,the lacustrine sedimentary facies model is widely used.