【摘要】 上二叠统长兴组分别与飞仙关组、吴家坪组整合接触,在元坝地区为一套稳定的海相碳酸盐岩沉积建造,有利于开展层序地层学研究。通过地震地层学方法、岩石岩相地层学方法以及Daubechies小波分析方法对元坝地区长兴组层序界面、体系域进行识别及特征研究,共划分出2个Ⅲ级层序(旋回)。进一步在单井上进行米兰科维奇旋回的划分及对比,通过岩石学及Daubechies小波方法解释结果可知db5曲线,由此识别出的36个旋回与人工解释的米兰科维奇旋回良好对应。将解释结果绘制Fischer图解,进一步对所得图解进行元坝地区长兴组地层可容空间演化特征分析,再次证实元坝地区长兴组存在的2次可容空间周期变化。最后以本实例为基础对Fischer图解形态特性、影响因素进行讨论。更多还原

【Abstract】 The Upper Permian Changhsing Formation in the Yuanba area of Sichuan Province is overlain by the Feixianguan Formation and underlain by the Wujiaping Formation.It is a marine carbonate series suitable for sequence stratigraphic analysis.On the basis of Daubechies wavelet analysis of seismostratigraphic and lithostratigraphic data , we were able to recognize several sequence boundaries and system tracts in the Changhsing Formation.Two third-order sequences ( cycles ) were identified.Further Daubechies wavelet analysis of seismic and well log data revealed 36 Milankovich cycles , which can be correlated with cycles based on lithostratigraphic interpretation.Further analysis using Fischer plots indicates that the Upper Permian Changhsing Formation represents two cycles of accommodation changes.更多还原