| 陆相沉积的天文地层研究方法简介——以井下地层为例 |
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| 作者单位： | 中国地震局地质研究所，中石化胜利油田有限公司地质科学研究院，中国科学院国家天文台 |
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| 摘 要： | 通过对我国大陆三十余口井的测井资料研究成果,归纳出对陆相地层进行天文地层研究的方法。介绍了所用的新的天文周期理论值、测井资料的选取及预处理方法,重点说明谱分析的数据点数的选定、不同参数(自然伽玛、自然电位和岩屑)的测井资料谱分析结果的对比,以实例说明如何选定主要优势旋回和AR值,以及FIR数字滤波器的基本性质和数字滤波结果,小波分析的特点和通过小波图进行调频的方法,并介绍了地层单位的延续时间计算和年龄确定方法。
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| 关 键 词： | 陆相沉积 天文地层 频谱分析 数字滤波 小波分析 |
INTRODUCTION TO THE METHOD FOR THE ASTROSTRATIGRAPHIC STUDY OF TERRESTRIAL SEDIMENTS:TAKING UNDERGROUND STRATIGRAPHY FOR AN EXAMPLE |
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| Authors: | XU Dao-yi ZHANG Hai-feng HAN Yan-ben YIN Zhi-qiang LI Bao-li and YAO Yi-min Institute of Geology China Earthquake Administration Beijing Geological Scientific Research Institute of Shengli Oilfield Company SINOPEC Dongying National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| Institution: | XU Dao-yi 1),ZHANG Hai-feng 2),HAN Yan-ben 3),YIN Zhi-qiang 3),LI Bao-li 2) and YAO Yi-min 2) 1) Institute of Geology,China Earthquake Administration,Beijing,100029,2) Geological Scientific Research Institute of Shengli Oilfield Company,SINOPEC,Dongying,257015,3) National Astronomical Observatories,Chinese Academy of Sciences,Beijing,100012 |
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| Abstract: | Based on the study of log data from over 30 wells in China mainland, a method for the astrostratigraphic study of terrestrial strata has been induced. A brief introduction to the method is given in this paper. Firstly, the new theoretical values of astronomic periods and the choice and pretreatment of well log data are introduced. Secondly the choice of data number for spectrum analysis and the comparison of the spectrum analysis results of different parameters (natural gamma, spontaneous potential, and clastic debris) are explained. Thirdly, an introduction of how to select chief dominant cycles and AR value, the general features of the FIR digital filters and one example of the digital filtering results are also given. A brief account of the wavelet analysis and the method for the tuning by using wavelet image is described. Finally the methods for the calculation of the duration of stratigraphic unit and the age determination are described. |
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| Keywords: | terrestrial sediment astrostratigraphy spectral analysis digital filter wavelet analysis |
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