CAJ | 학술논문

通过识别沉积基准面旋回产生的层序界面，东营凹陷中始新统上部－上始新统可划分出四个层序。各层序具有相似的成因和体系域构成。其低位域(LST)发育辫状河、下切水道－浊积扇、扇三角洲、废弃型三角洲和水下扇。湖泊扩张体系域(EST)发育由深湖泥岩、油页岩、白云岩、滨浅湖组成的湖泊体系、破坏型三角洲及曲流河体系。湖泊萎缩体系域(RST)发育浅湖、河流三角洲体系及扇三角洲体系。由于同一层序在盆地发育的构造部位不同，可以表现出三种层序样式：A位于构造坡折带之下的深湖－三角洲环境层序样式，B位于构造坡折带之上的下切水道－浅湖环境层序样式和C位于湖域之外的河流－泛滥平原环境层序样式。并在综合研究的基础上建立了东营凹陷中始新统上部－上始新统层序的成因模式。指出在每个三角洲主朵体的前方同生断裂带及其靠近洼陷一侧是低位砂体的主要发育区，也是低位砂体油藏的富集区和寻找隐蔽油藏的主要方向。
통과식별침적기준면선회산생적층서계면，동영요함중시신통상부－상시신통가화분출사개층서。각층서구유상사적성인화체계역구성。기저위역(LST)발육변상하、하절수도－탁적선、선삼각주、폐기형삼각주화수하선。호박확장체계역(EST)발육유심호니암、유혈암、백운암、빈천호조성적호박체계、파배형삼각주급곡류하체계。호박위축체계역(RST)발육천호、하류삼각주체계급선삼각주체계。유우동일층서재분지발육적구조부위불동，가이표현출삼충층서양식：A위우구조파절대지하적심호－삼각주배경층서양식，B위우구조파절대지상적하절수도－천호배경층서양식화C위우호역지외적하류－범람평원배경층서양식。병재종합연구적기출상건립료동영요함중시신통상부－상시신통층서적성인모식。지출재매개삼각주주타체적전방동생단렬대급기고근와함일측시저위사체적주요발육구，야시저위사체유장적부집구화심조은폐유장적주요방향。
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.