High-frequency sequences and their control on reef-shoal complexes: a case study of the Changxing formation at the southern margin of the Kaijiang-Liangping trough, NE Sichuan Basin
Na Zhang
The Upper Permian Changxing Formation at the southern margin of the Kaijiang-Liangping Trough (NE Sichuan Basin) is characterized by small-scale, thin, and scattered reef-shoal complexes, resulting in strong stratigraphic heterogeneity. Conventional qualitative methods struggle to achieve accurate high-frequency sequence division due to limited core data. To address this, we integrate INPEFA (Integrated Prediction Error Filter Analysis) with wavelet transform techniques using drilling and loggin