Sequence Stratigraphy and Lithofacies Paleogeography in Ziniquanzi Formation in Piedmont Fault-fold Belt, Southern Margin of Junggar Basin

Abstract

Abstract: The correlation study of outcrop and drilling-well logging data shows that Ziniquanzi formation of Paleogene in piedmont faultfold belt in southern margin of Junggar basin can be divided into two 3-order sequences with which sequence stratigraphy framework of the studied area is set up, based on existing two sets of mudstones in regional and steady development of Ziniquanzi formation, regional unconformity and erosion surface or sedimentary system interface. The lithofacies paleogeography map is drawn in terms of sequence. The feature and evolution of lithofacies paleogeography during Ziniquanzi deposition period within this framework are discussed. The early period of it (Sequence I) is characterized by co-existing alluvial fan, braided river-braided channel delta and lake facies; the late period (Sequence II) by the expanding lake and the assemblage of braided river-braided channel delta-lake facies dominated by lake deposit.

Key words: Junggar basin, sequence, paleogene, lithofacies paleogeography

CLC Number:

TE111.3

SHEN Yu-lin, GUO Ying-hai, LI Zhuang-fu, RAN Qi-gui, BEN Xu-dong. Sequence Stratigraphy and Lithofacies Paleogeography in Ziniquanzi Formation in Piedmont Fault-fold Belt, Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2006, 27(2): 169-172.

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