Sequence Stratigraphic Division and Recognition Based on Wavelet Analysis: Example from the Upper Permian Longtan Formation in Eastern Sichuan Basin
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摘要: 以川东地区上二叠统龙潭组为研究对象，应用Matlab小波分析工具对川东地区龙潭组钻井的自然伽马曲线进行小波变换和频谱分析，以期为川东龙潭组勘探开发提供基础地质依据。结果显示川东地区龙潭组可划分为3个三级层序，其中SQ1可识别出为低位体系域、海侵体系域及高位体系域，而SQ2、SQ3可分别识别出海侵体系域与高位体系域；基于自然伽马测井曲线小波变换绘制的Fischer图解对于可容纳空间的变化具有良好的显示，与三级层序呈现出较好的对应关系；频谱分析结果显示，川东龙潭组对于米兰科维奇旋回具有较为完整的记录，川东地区龙潭组发育15个偏心率长周期，而受沉积环境不同的影响，发育的偏心率短周期及斜率周期有所不同。Abstract: Taking the upper Permian Longtan Formation in eastern Sichuan Basin as an example, GR logging data from the well of Longtan Formation in eastern Sichuan Basin have been analyzed by IDL wavelet toolkit of Matlab through using wavelet transform and frequency spectrum, which will provide a geological basis for the exploration and development of Longtan Formation in eastern Sichuan Basin. Results show that the Longtan Formation in eastern Sichuan can be divided into three third-order sequences, that is SQ1 divided into LST, TST, HST, while SQ2 and SQ3 both divided into TST and HST, respectively. Fischer plots based on wavelet transform of GR logging curve has a good display for accommodation, showing a good corresponding relationship with third-order sequence. Results of frequency spectrum indicates that the Longtan Formation has a more complete record of Milankovich cycles, with 15 eccentricity long cycles developed in eastern Sichuan Basin, but the eccentricity short cycle and slope cycle are different, which was influenced by sedimentary environment.
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Key words:
- eastern Sichuan Basin /
- Longtan Formation /
- wavelet transform /
- Fischer plots
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