Sedimentary characters and geological implication of turbidite of the Chang 6 and Chang 7 intervals of Upper Triassic Yanchang Formation in Huangling area，Ordos Basin
Feng Juanping1, Li Wenhou2, Ouyang Zhengjian3,4
1 College of Geology and Environment，Xi′an University of Science and Technology，Xi′an 710054，Shaanxi 2 Department of Geology，Northwest University，Xi′an 710069，Shaanxi 3 Institute of Sedimentary Geology，Chengdu University of Technology，Chengdu 610059，Sichuan 4 Research Institute of Exploration and Development， PetroChina Changqing Oilfield Company，Xi′an 710018，Shaanxi
Abstract Based on cores，thin sections，grain size analyses，the sedimentary characteristics of turbidite and its geological significance of the Chang 7 and Chang 6 intervals of Upper Triassic Yanchang Formation have been studied systematically in Huangling area of the Ordos Basin.The study results indicated that the turbidites are angular and sub-angular arkose and has the typical characteristics of turbidite deposition according to the results of grain size analysis.The turbidites are characterized by erosion surfaces，synsedimentary deformation structures，graded sequence and the Bouma sequences including ABC、AB、ADE、AE、CDE and A overlaying models which are the typical sedimentary characteristics of turbidite.The turbidite intervals mainly include two types，one is thin bedded and the other is medium-thick bedded.The tubidites are formed by the slump sediments of delta-front and can be divided into two sedimentary facies belts， i.e. the central and marginal microfacies.Turbidity sandstone is regarded as good reservoir formed in semi-deep lacustrine to deep lacustrine environments and becomes important oil-gas exploration target.
About author: Feng Juanping，born in 1978，is a lecturer in Xi′an University of Science and Technology with a Ph.D.degree. Now she is engaged in the researches of sedimentology, reservoir geology and analysis of oil and gas-bearing basin.E-mail: fengjuanping@163.com. About the corresponding author Ouyang Zhengjian，born in 1976， is engaged in the researches of orogen and basin geology.E-mail: ouyangzhengjian@126.com.
Cite this article:
Feng Juanping,Li Wenhou,Ouyang Zhengjian. Sedimentary characters and geological implication of turbidite of the Chang 6 and Chang 7 intervals of Upper Triassic Yanchang Formation in Huangling area，Ordos Basin[J]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(3): 295-302.
Feng Juanping,Li Wenhou,Ouyang Zhengjian. Sedimentary characters and geological implication of turbidite of the Chang 6 and Chang 7 intervals of Upper Triassic Yanchang Formation in Huangling area，Ordos Basin[J]. JOPC, 2012, 14(3): 295-302.
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