| 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 |
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| 引用本文： | 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. |
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| 作者姓名： | 冯有良 潘元林 郑和荣 |
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| 作者单位： | 1 中国地质大学 武汉 430074; |
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| 基金项目： | 国家自然科学基金;49872045; |
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| 摘 要： | 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。
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| 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 |
| 文章编号： | 1000-0550(2000)03-0376-08 |
| 收稿时间： | 1999-03-04 |
| 修稿时间： | 1999年3月4日 |
Sequence Stratigraphic Model and Its Petroleum Geological Significance of Upper Part of Middle Eocene Series and Upper Eocene Series in Dongying Depression |
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| FENG You-liang,PAN Yuan-ling,ZHENG He-rong.Sequence Stratigraphic Model and Its Petroleum Geological Significance of Upper Part of Middle Eocene Series and Upper Eocene Series in Dongying Depression[J].Acta Sedimentologica Sinica,2000,18(3):376-383. |
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| Authors: | FENG You-liang PAN Yuan-ling ZHENG He-rong |
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| Institution: | 1 China University of Geosciences, Wuhan 430074;2 Geological Scientific Research Institute of Shengli Petroleum Administration Bureau, Dongying Shandong 257015 |
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| 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. |
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| Keywords: | Dongying depression Upper part of middle Eocene series and upper Eocene series sequence stratigraphic model oil and gas accumulation |
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