陇东地区三叠系延长组沉积层序及充填响应特征

doi:10.11743/ogg20060202

Abstract

Abstract:

Triassic Yanchang Formation in Longdong area is a super-secular cycle bounded on top and base by regional unconformities/disconformities.It can be divided into four secular cycles according to subsidiary structure,climate,provenance condition and fluctuation of lake level during the sedimentary evolutionary cycle of the sequence.Sequence filling dynamics of Yanchang Formation is studied through dynamic genesis analysis of the sequence-basin system.It is believed that the development and evolution of the 4 secular cycles would have been controlled by pulsativity of tectonic subsidence,cyclicity of climate and the resulting differences in sediment yield.The responses of sequence filling dynamics occurring during evolution of the basin have further been discussed in this paper.It is pointed out that there are different combinations of sedimentary subfacies,different types of sediments and different superimposition patterns of sequences in different evolutionary periods of the lake basin.

Key words: depositional sequence, lake basin evolution, filling dynamics, Yanchang Formation, Longdong area, Ordos basin

CLC Number:

TE111.3

Chen Hongde, Ni Xinfeng. Depositional sequence and filling response characteristics of Triassic Yanchang Formation In Longdong area[J]. Oil & Gas Geology, 2006, 27(2): 143-151.

References

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Depositional sequence and filling response characteristics of Triassic Yanchang Formation In Longdong area

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