Evolution of Sedimentary Fillings in Triassic Yanchang Formation&nbsp; and Its Response to Indosinian Movement in Ordos Basin

WANG  Feng, TIAN  Jing-Chun, FAN  Li-Yong, CHEN  Rong, QIU  Jun-Li

doi:10.11764/j.issn.1672-1926.2010.06.882

Natural Gas Geoscience >

2010 , Vol. 21 >Issue 6: 882 - 889

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.06.882

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Evolution of Sedimentary Fillings in Triassic Yanchang Formation and Its Response to Indosinian Movement in Ordos Basin

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1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Chengdu University of Technology，
Chengdu 610059，China; 2.Research Institute of Exploration and Development，Changqing Oilfield Company
of CNPC，Xi′an 710021，China; 3.Key Laboratory of Petroleum Resources Research，Instituteof Geology and Geophysics，Chinese Academy of Sciences，Lanzhou 730000，China

Received date: 2010-04-01

Revised date: 2010-06-16

Online published: 2010-12-10

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Abstract

Based on stratigraphy,lake basin fillings,basin margin sediments,and regularity of event deposits in the Triassic Yanchang Formation,we discussed the early Indosinian event and sedimentary response in Ordos basin.The results indicated that the Indosinian movement was weak within 9 and 10 intervals of Yanchang Formation,the basin inherited the structurally smooth pattern since late Hercynian,and the lake basin began to develop.At 8 interval of Yanchang Formation,the Qinling orogenic uplift made the basin tectonic activity increase rapidly,associated with a series of mountain basin conglomerate in the north Qinling area along Shangdan fault and denudation of marine carbonate strata in the southern basin.The carbonate debris was mixed into the sandstone.At 7 interval of Yanchang Formation,the molasse was deposited rapidly in the southwest with the strong expansion of the lake basin,associated with frequent deposit events.At Indosinian era,the Ordos basin was in the most active period of plate collision splicing and episodic tectonic movements.At time from interval 6 to interval 4,seismites existence and large decrease of tuff content in the strata of southwest basin suggested that the intensity and frequency of tectonic activity would decrease,and the lake basin re-enter the stable subsidence period.With development of the Indosinian movement,the lake basin underwent a complete structural process,including initial depression,a strong depression,up and down,and atrophy,associated with rapid subsidence,slow filling and deposition center continued to migrate southwestward.

Key words： Sedimentary response; Structural evolution; Yanchang Formation; Ordos basin.

Cite this article

WANG Feng, TIAN Jing-Chun, FAN Li-Yong, CHEN Rong, QIU Jun-Li . Evolution of Sedimentary Fillings in Triassic Yanchang Formation and Its Response to Indosinian Movement in Ordos Basin[J]. Natural Gas Geoscience, 2010 , 21(6) : 882 -889 . DOI: 10.11764/j.issn.1672-1926.2010.06.882

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