Study on meter-scale cycles of the Lower Cretaceous Quantou Formation in SK-1 well
Online published: 2012-12-20
Based on the data of core and well logging of SK-1 well, this paper carried out the sedimentary microfacies identification, and divided cycle into third-order, fourth-order, fifth-order and meter-scale cycles. According to the cyclic sequence, this paper carried out the Fischer graphic analysis, and established cyclic stratigraphic framework. The absolute age of Quantou Formation in Songliao Basin was obtained by using well logging spectral analysis, and the cycle times were estimated. The result shows that the fifth-order cycle is 112 ka and fourth-order cycle is 379 ka, which is separately corresponding to Milankovitch eccentricity short circle 85～140 ka and Milankovitch eccentricity long circle 350～400 ka. The results coincide with the result of logging. This further illustrates that the forming of cycle sequence formation is controlled by Milankovitch cycle, which provides scientific foundation for the test of influencing factors of climate change in Cretaceous period.
Key words： hydrocarbon source rocks; geochemistry; biomarker; Lower Cretaceous; Chagan Sag
LIU Jun , LUO Xiaoping , LI Hui , LI Xinjun . Study on meter-scale cycles of the Lower Cretaceous Quantou Formation in SK-1 well[J]. Lithologic Reservoirs, 2012 , 24(6) : 38 -42 . DOI: 10.3969/j.issn.1673-8926.2012.06.007
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