SK-1 井下白垩统泉头组米级旋回研究
网络出版日期: 2012-12-20
基金资助
国家重点基础研究发展计划“973”项目“白垩纪地球表层系统重大地质事件与温室气候变化”(编号:2006CB701403)资助
Study on meter-scale cycles of the Lower Cretaceous Quantou Formation in SK-1 well
Online published: 2012-12-20
通过对 SK-1 井泉头组岩心的详细观察与描述,并结合测井曲线特征,开展了泉头组沉积微相的识别,并在此基础上,划分了Ⅲ级、Ⅳ级、Ⅴ级及米级旋回。 通过对所划分的旋回地层进行 Fischer 图解分析,建立了反映泉头组地层叠置关系的旋回地层格架。 利用测井谱分析,结合前人分析测试得到的松辽盆地泉头组的绝对年龄,对各级旋回进行周期计算,发现Ⅴ级旋回周期约为 112 ka,Ⅳ级旋回周期约为 379 ka,分别与米兰科维奇偏心率短周期 85~140 ka 和长周期 350~400 ka 相对应,从而表明 SK-1 井旋回地层的形成受米兰科维奇旋回的控制。 此研究结果为早白垩世气候变化对旋回地层的影响研究提供了科学依据。
刘军 , 罗小平 , 李辉 , 李新军 . SK-1 井下白垩统泉头组米级旋回研究[J]. 岩性油气藏, 2012 , 24(6) : 38 -42 . DOI: 10.3969/j.issn.1673-8926.2012.06.007
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
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