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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2004-05
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Use of natural gamma-ray well log to study sedimentary cycles of Yan'an Formation in Eastern Gansu, Ordos Basin, China

LI Feng-jie~1, WANG Duo-yun~1, Cheng Wei~2 f Chinese Academy of Sciences, China; 2.Liaoning Institute of Engineering Survey, Jinzhou, China)  
Natural gamma\|ray well log that include a great amount of geological information can well reflect stratigraphic cycles caused by climate changes. In this paper, the authors use frequency spectral analysis method to analyze the gamma-ray curves of liminetic facies of Yan'an Formation in Longdong area, Ordos Basin and find out that the strata conserve well Milankovitch cycles and the main sedimentary cycles are 123, 46.8, 36.7, 21.8 and 17.9 ka, corresponding with the eccentricity cycle, the obliquity cycle and the precession cycle of Milankovitch cycle. So it is reasonable to deduce that the sedimentary cycles are (controlled) by palaeoclimate which is caused by the eccentricity cycle, the obliquity cycle and the precession cycle. The thickness range of sedimentary cycles caused by the eccentricity cycle is 7.86~16.75 m, that caused by the obliquity cycle is 2.34~6.36 m and that caused by the precession cycle is 14~2.96 m. (Frequency) spectral analysis can be used to study the high frequency with well log.
【Fund】: 中国科学院资源环境领域知识创新工程重要方向项目资助(KZCX3-SW-128-04)
【CateGory Index】: P539.2
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