Developmental Characteristics of Turbidite and Its Implication on  Petroleum Geology in LateTriassic Ordos Basin

Key words: 
• Ordos /
• LateTriassic /
• turbidite /
• geological significance

Abstract: Unequal thickness of turbidite sandbodies are found in the deeplake area of Triassic Yanchang Formation Ch7 and Ch6 member of Ordos Basin. Based on the integrated study of the sedimentary facies features, rock texture, structural attitude of the Ch6Ch7 drilling core, the turbidite was caused by the deltafront landsliding. The turbidite is concluded into two types: the coarse grains fluxoturbidite was mainly developed with braid river deltafront which the clastic source was from southwest; the fine grains fluxoturbidite was mainly developed with meandering river deltafront which the clastics source was from northwest. Figuring out the developmental distribution and regular pattern of turbidite in the Ordos Triassic lakebasin not only directs the exploration of the turbidite reservoir in the deep lake, but also benefits the study on hydrocarbon accumulation of the turbidite on the deeplake facies.