Sequence Stratigraphic Model and Its Petroleum Geological Significance of Upper Part of Middle Eocene Series and Upper Eocene Series in Dongying Depression

FENG You liang; PAN Yuan ling; ZHENG He rong

By identifying sequence boundary generated by base level cycle, the author have reloghizcd fled four sequences in upper part of middle Eocene series and upper Eocene series of Dongying depression. Every sequence has similar genesis and system tract trait. Lowstand system tract (LST) developed braided fluvial, incised channel一turbidity fans,fan deltas,abandoned deltas and subfan.Iacustrine expanding system tract (EST) developed lacustrine sys- tem, consisted of deep mudstone, oil shale, dolomite and shallow lacustrine, destroyed deltas and meandering streams. Lacustrine retreating system tract (R5T) developed shallow lacustrine, fluvial一delta system, and Ian delta system. Because sequence developed in different sites of the basin, the sequence shows three kinds of sequence style: A, deep lacustrine一delta environment sequence style distributing below structure break. fd, incised channel 一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 up the genetic model of upper part of middle Eocene series and upper Eocene series in ilongying deprewsion.The model indicates that sequence generation was controlled by third cycle of base level as a function of tectonic movement and climate. Because water volume of lake is finite, tilting and faulting redistributes the lake water toward increased accommodation space area, base level fell to generate lowstand system tract characterized by incised channel and turbidity fart. In the inactive epoch faulting of, base level, affected by elirnate, rise rapidly to generate lacustrine expanding system tract characterized by lacustrine facies spreading. When the lake level recovering to the situation before faulting, Ease level arrived at summit and began to fall, because faulting made tolxg graphy steep, sedintenra- ry supplied enough, lacustrine retreating system tract characterigxd by delta was generated. Depositing fault Cannes near depression parts in front of the main lobe of delta distribute mainly lnwstand sands, which are the main accu- mulatinn canes of lowstand sand resen"oir and prospecting direction for exploring shelter reservoir.

1 China University of Geosciences, Wuhan 430074;

2 Geological Scientific Research Institute of Shengli Petroleum Administration Bureau, Dongying Shandong 257015

Received Date: 1999-03-04

Rev Recd Date: 1999-05-18

Publish Date: 2000-09-10

Key words:

Abstract: By identifying sequence boundary generated by base level cycle, the author have reloghizcd fled four sequences in upper part of middle Eocene series and upper Eocene series of Dongying depression. Every sequence has similar genesis and system tract trait. Lowstand system tract (LST) developed braided fluvial, incised channel一turbidity fans,fan deltas,abandoned deltas and subfan.Iacustrine expanding system tract (EST) developed lacustrine sys- tem, consisted of deep mudstone, oil shale, dolomite and shallow lacustrine, destroyed deltas and meandering streams. Lacustrine retreating system tract (R5T) developed shallow lacustrine, fluvial一delta system, and Ian delta system. Because sequence developed in different sites of the basin, the sequence shows three kinds of sequence style: A, deep lacustrine一delta environment sequence style distributing below structure break. fd, incised channel 一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 up the genetic model of upper part of middle Eocene series and upper Eocene series in ilongying deprewsion.The model indicates that sequence generation was controlled by third cycle of base level as a function of tectonic movement and climate. Because water volume of lake is finite, tilting and faulting redistributes the lake water toward increased accommodation space area, base level fell to generate lowstand system tract characterized by incised channel and turbidity fart. In the inactive epoch faulting of, base level, affected by elirnate, rise rapidly to generate lacustrine expanding system tract characterized by lacustrine facies spreading. When the lake level recovering to the situation before faulting, Ease level arrived at summit and began to fall, because faulting made tolxg graphy steep, sedintenra- ry supplied enough, lacustrine retreating system tract characterigxd by delta was generated. Depositing fault Cannes near depression parts in front of the main lobe of delta distribute mainly lnwstand sands, which are the main accu- mulatinn canes of lowstand sand resen"oir and prospecting direction for exploring shelter reservoir.

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Reference (13)

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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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