李凤杰,王多云,郑希民,刘自亮,王峰,王志坤,李树同
LI Feng jie 1、2 ;WANG Duo yun 1;ZHENG Xi min 1;LIU Zi liang 1;WANG Feng 1;WANG Zhi kun 1;LI Shu tong 1 (1.Lanzhou Institute of Geology;

• 1:中科院兰州地质研究所
• 2:中科院兰州地质研究所
• 3:中科院兰州地质研究所
• 4:中科院兰州地质研究所

摘要(Abstract)：

利用频谱分析法 ,以鄂尔多斯盆地陇东地区延安组延二段为例 ,对发育泥炭沼泽河流体系的自然伽马测井曲线进行分析 ,得出地层中保存着厚度稳定的地层旋回 ,其厚度比值与米兰科维奇旋回比值之间有很好的一致性。因此 ,可以认为 :米兰科维奇旋回是影响本区地层沉积旋回发育的主要因素 ;古气候周期性变迁决定着大面积沼泽化的曲流河—网状河流体系中高频沉积旋回的发生、发展和定格。其中偏心率周期引起的地层旋回厚度变化范围为 8 72～ 11 2 9m ;地轴倾角周期和岁差周期引起的地层旋回厚度变化范围分别为 2 5 4～ 4 3m和 1 2 3～ 1 91m。本区含煤层和碳质泥岩地层旋回厚度约 10m ,其发育受控于时间为 12 3ka的偏心率周期。自然伽马曲线包含丰富的地质信息 ,很好地反映了由气候变化引起的地层旋回。
By means of frequency spectral analysis method,the authors use the Gamma ray curves of fluvial depositional system growing carbonaceous marsh to analyze the sedimentary cycle of Y2 member,Yan′an Formation in Longdong area,Ordos Basin,reaching that sedimentary cycles having stable thickness are conserved very well in the strata.The ratio of the thickness of the sedimentary cycles corresponds with the ratio of Milankovitch cycles.Therefore,it is reasonable to deduce that the sedimentary cycles are controlled by palaeoclimate,which caused by the Milankovitch cycles,and its cyclical transformation determined the formation and the evolution of high frequency sedimentary cycle in marshland or flood plain deposit and transitional facies of river lake alternately appearing.The thickness ranges of sedimentary cycles caused by the eccentricity cycle,the obliquity cycle and the precession cycle are respective 8.72～11.29 m,2.54～4.3 m and 1.23～1.91 m.The thickness of the stratigraphic cycles including coal and carbonaceous shale is about 10 m,and it is controlled by the eccentricity cycle,which is 123 ka.Gamma ray curves including a great amount of geological information reflect well stratigraphic cycles caused by climate changes.

关键词(KeyWords)： 测井曲线;米兰科维奇旋回;快速傅立叶变换;延安组;鄂尔多斯盆地
logging curves;Milankovitch cycles;fast Fourier transform;Yan′an Formation;Ordos Basin

Abstract:

Keywords:

基金项目(Foundation): 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(编号 :KZCX3—SW— 12 8— 0 4 )

作者(Authors): 李凤杰,王多云,郑希民,刘自亮,王峰,王志坤,李树同
LI Feng jie 1、2 ;WANG Duo yun 1;ZHENG Xi min 1;LIU Zi liang 1;WANG Feng 1;WANG Zhi kun 1;LI Shu tong 1 (1.Lanzhou Institute of Geology;

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