SEDIMENTARY CYCLES AND DEPOSITIONAL SYSTEMS OF SUBMEMBER Es3(3～4)IN THE QIANLIYUAN SUBDEPRESSION OF THE DONGPU SAG
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摘要: 前梨园次洼Es3(3～4)亚段中反映湖进-湖退的沉积旋回非常发育.这种旋四层序在区域范围内可追踪对比,尤其是在高分辨率地震剖面上也具有较好的可追踪对比性.控制旅回发育的主要因素是区域内的构造活动与气候变化所引起的湖平面波动,相当于全球气候变化的4～5级旋回.区内发育的沉积体系主要为三角洲体系,湖底扇体系与深湖-半深湖体系,湖面的波动对这些沉积体系的形成和发育有明显的控制作用.Abstract: In the Submember Es3(3～4) of Qianliyuan Subdepression,sedimentary cycles reflecting lake transgression-lake regression are well-developed.This kind of cyclic sequences can be trsced and correlated in the studied area.Especially,they have better traceability and contrastability on high resolution seismic profiles.The major factors controlling the cyclic development are the lake-level fluctuation induced by tectonic action and climatic changes in the area.The cyclic sequences may correspond to the fourth-fifth order cycles of global climatic changes.The depositional systems developed in the area mainly include deltaic system,lakebed fan system and deep-bathyal lake system.The fluctuation of lake levels show obvious controls on the formation and development of these depositional systems.
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