渤海湾盆地沾化凹陷下第三系高精度层序地层学研究

doi:10.11743/ogg20040507

Abstract

Abstract:

Based on 3-D seismic,drilling data and other data,and by using the theories and methods of high-accuracy sequence stratigraphy,sequence stratigraphic framework has been established in Zhanhua depression,which consists of 1 first-order sequence,4 second-order sequences,17 third-order sequences,51 system tracts,70 parasequence sets and 109 parasequences.Critical surfaces,such as sequence boundary,initial flooding surface and maximum flooding surface,have been defined on seismic profiles,according to the termination patterns of reflection configuration,transformation of stacking patterns of parasequence sets and lithologic profile.Sedimentary systems are categorized and restored based on the stacking pattern of parasequence sets and seismic phases.In the sequence stratigraphic framework,lowstand system tract (LST) consists of many types of sedimentary systems,which are characterized by alluvial fan-fan delta (delta)-lowstand wedge-lowstand fan under control of the third-order slope break.The sedimentary systems in transgression system tract and high stand system tract have inheritance.Combinations of sedimentary systems in each system tract have genetic continuity.Areas where sedimentary systems developed during strong fault subsidence and allocated with unconformities and fault planes are the favorable exploration play.

Key words: Zhanhua depression, high-accuracy, sequence stratigraphic framework, lowstand systems tract, third-order slope break, favorable play

CLC Number:

TE111.3

Wei Kuisheng, Shi Shuling, Li Daliang, Luo Yan, Lu Songtao, Qiu Yigang, Zong Guohong, Zheng Herong, Hao Yunqing, Song Guoqi. High accuracy sequence stratigraphy of Lower Tertiary in Zhanhua depression, Bohai bay basin[J]. Oil & Gas Geology, 2004, 25(5): 513-518,538.

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High accuracy sequence stratigraphy of Lower Tertiary in Zhanhua depression, Bohai bay basin

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