新疆石油地质 ›› 2007, Vol. 28 ›› Issue (2): 170-174.

• 油气勘探 • 上一篇    下一篇

频谱分析法确定乌什凹陷白垩系米氏沉积旋回及沉积速率

郑民1,2, 彭更新3, 雷刚林3, 黄少英3, 吴超3, 郭华清3, 李曰俊4   

  1. 1.中国科学院 地质与地球物理研究所 兰州油气资源中心, 兰州 730000;
    2.中国科学院 研究生院, 北京 100039;
    3.中国石油 塔里木油田分公司, 新疆 库尔勒 841000;
    4.中国科学院 地质与地球物理研究所, 北京 100029
  • 收稿日期:2006-05-18 修回日期:2006-08-22 出版日期:2007-04-01 发布日期:2020-07-31
  • 作者简介:郑民(1979-), 男, 山东潍坊人, 在读博士研究生, 石油地质,(Tel) 13659320837(E-mail) zhengminbeijing@163.com
  • 基金资助:
    国家973项目, 高效天然气藏形成分布与凝析、低效气藏经济开发的基础研究(2001CB209104-04); 国家自然科学基金项目, 塔里木盆地北缘始新统-古新统磁性地层划分(400704014)共同资助

Applying Frequency Spectral Analysis to Identify Milankovitch Cycle and Calculate Sedimentation Rate of Cretaceous in Wushi Sag

ZHENG Min1,2, PENG Gengxin3, LEI Gang-lin3, HUANG Shao-ying3, WU Chao3, GUO Hua-qing3, LI Yue-jun4   

  1. 1. Lanzhou Petroleum Resource Center, Institute of Geology and Geophysics, CAS, Lanzhou, Gansu 730000, China;
    2. Graduate School, CAS, Beijing 100039, China;
    3. Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China;
    4. Institute of Geology and Geophysics, CAS, Beijing 100029, China
  • Received:2006-05-18 Revised:2006-08-22 Online:2007-04-01 Published:2020-07-31

摘要: 以自然伽马曲线包含的丰富地质信息为基础,通过小波分析与快速傅里叶变换相结合,运用频谱分析法在乌什凹陷白垩系识别出米兰柯维奇沉积旋回,并确定出米氏旋回的厚度,在此基础上精确计算出资料区白垩系各层组沉积速率。其中偏心率周期引起的地层旋回厚度变化为8.70~13.89m;地轴倾角周期引起的地层旋回厚度变化为3.01~5.88m;岁差周期引起的地层旋回厚度变化为1.28~2.44m.4口采样井白垩系地层平均沉积速率为0.09378mm/a.

关键词: 乌什凹陷, 自然伽马曲线, 傅里叶变换, 沉积旋回, 沉积速率

Abstract: Based on abundant information of gamma-ray curves, combining wavelet analysis with fast Fourier transform, the Milankovitch cycle and its thickness of Cretaceous in Wushi sag is identified using frequency spectral analysis, then the sedimentation rates of each layer of Cretaceous in studied area are precisely calculated. The results show that the thickness of sedimentary cycle caused by eccentricity cycle ranges from 8.70 m to 13.89 m; the thickness of it caused by obliquity cycle from 3.01 m to 5.88 m; the one of it by precession cycle from1.28 mto 2.44 m, and the average sedimentation rate of Cretaceous strata fromfour sampling wells is 0.093 78 mm/a.

Key words: Wushi sag, gamma-ray curve, Fourier transform, sedimentary cycle, sedimentation rate/velocity

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