沉积学报2000，Vol.18Issue(3)：376-383,8.
东营凹陷中始新统上部－上始新统层序地层模式及其石油地质意义
Sequence Stratigraphic Model and Its Petroleum Geological Significance of Upper Part of Middle Eocene Series and Upper Eocene Series in Dongying Depression
摘要
Abstract
By identifying sequence boundary generated by base level cycle, the author have reloghizcd fled four sequencesin upper part of middle Eocene series and upper Eocene series of Dongying depression. Every sequence has similargenesis and system tract trait. Lowstand system tract (LST) developed braided fluvial, incised channel - turbidityfans,fan deltas,abandoned deltas and subfan . Lacustrine expanding system tract (EST) developed lacustrine sys-tem, consisted of deep mudstone, oil shale, dolomite and shallow lacustrine, destroyed deltas and meanderingstreams. Lacustrine retreating system tract (RST) developed shallow lacustrine, fluvial- delta system, and fandelta system. Because sequence developed in different sites of the basin, the sequence shows three kinds of sequencestyle: A, deep lacustrine - delta environment sequence style distributing below structure break. B, incised channel- shallow lacustrine environment sequence style distributing upward structure break. C, fluvial - flooding plain se-quence environment style distributing beyond lacustrine. Based on comprehensive research, this paper has built upthe genetic model of upper part of middle Eocene series and upper Eocene series in Dongying depression . The modelindicates that sequence generation was controlled by third cycle of base level as a function of tectonic movement andclimate. Because water volume of lake is finite, tilting and faulting redistributes the lake water toward increasedaccommodation space area, base level fell to generate lowstand system tract characterized by incised channel andturbidity fan. In the inactive epoch faulting of, base level, affected by climate, rise rapidly to generate lacustrineexpanding system tract characterized by lacustrine facies spreading. When the lake level recovering to the situationbefore faulting, base level arrived at summit and began to fall, because faulting made topography steep, sedimenta-ry supplied enough, lacustrine retreating system tract characterized by delta was generated. Depositing fault zonesnear depression parts in front of the main lobe of delta distribute mainly lowstand sands, which are the main accu-mulation zones of lowstand sand reservoir and prospecting direction for exploring shelter reservoir.关键词
东营凹陷中始新统上部－上始新统层序地层模式油气聚集。Key words
Dongying depression Upper part of middle Eocene series and upper Eocene series sequence strati-graphic model oil and gas accumulation分类
天文与地球科学引用本文复制引用
冯有良,潘元林,郑和荣..东营凹陷中始新统上部－上始新统层序地层模式及其石油地质意义[J].沉积学报,2000,18(3):376-383,8.基金项目
国家自然科学基金(批准号：49872045)资助 （批准号：49872045）
