Analysis on Character istics and Controls of High-Frequency Sequences of Lower Cretaceous Ser ies in Wuerxun Depression

ZHANG Cheng; LI Chun-bai; CHU Mei-juan; SHI Shu-ling

Based on the geological and geophysical data, this paper analyses characteristics and controls of high-frequency sequences of Lower Cretaceous Series in Wuerxun Depression. High-frequency sequences occur along the strike direction of the depression in third-order composite sequence 7 and 8, and show downlap of reflections onto the composite condensed section. Most of high-frequency sequences belong in type I, but the scopes of unconformities are very limited. There are three system tracts and parasequences stacking patterns from aggradation-progradation-retrogra-dation-progradation in high-frequency sequences. Sixteen high-frequency sequences are identified in this area. The average period and the sediment velocity of which is about 0.22～0.28 Ma and 0.57～0.76 m /kyr, respectively.This study suggests that high-frequency sequences have the greatest chance of forming under the conditions of low tectonic subsidence and high sediment supp ly during third-order base-level relative stabilizing and descending periods,and that the marginalmorphology of basin controls the geometry of high-frequency sequences

1. China University of Geosciences, Wuhan 430074;

2. Institute of Exploration and Development of Daqing Oilfield Company Ltd. Daqing Heilongjiang 163712;

3. China University of Geosciences, Beijing 100083

Received Date: 2004-12-14

Rev Recd Date: 2005-04-13

Publish Date: 2005-12-10

Key words:

Abstract: Based on the geological and geophysical data, this paper analyses characteristics and controls of high-frequency sequences of Lower Cretaceous Series in Wuerxun Depression. High-frequency sequences occur along the strike direction of the depression in third-order composite sequence 7 and 8, and show downlap of reflections onto the composite condensed section. Most of high-frequency sequences belong in type I, but the scopes of unconformities are very limited. There are three system tracts and parasequences stacking patterns from aggradation-progradation-retrogra-dation-progradation in high-frequency sequences. Sixteen high-frequency sequences are identified in this area. The average period and the sediment velocity of which is about 0.22～0.28 Ma and 0.57～0.76 m /kyr, respectively.This study suggests that high-frequency sequences have the greatest chance of forming under the conditions of low tectonic subsidence and high sediment supp ly during third-order base-level relative stabilizing and descending periods,and that the marginalmorphology of basin controls the geometry of high-frequency sequences

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Analysis on Character istics and Controls of High-Frequency Sequences of Lower Cretaceous Ser ies in Wuerxun Depression

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