Abstract:

Based on high-resolution sequence stratigraphy, with medium-term base level rising half-cycle and falling half-cycle as basic research units, ideal sequence stratigraphy models and log curve models of them are set up. Wavelet analysis models are established on log curve models by the Morlet wavelets, and their response to different base level cycles are analyzed. Then, with long-term base level rising half-cycle and falling half-cycle as research units, which are stacked by various medium-term base level cycle, ideal sequence stratigraphy models and log curve models of them are set up. Wavelet analysis models are established and wavelet models response to the long-term base level cycle, base level cycle surface and its subordinate cycle units are analyzed. An example of well Shi 134 shows that wavelet analysis models of different types of base level cycles can be used to recognize and divide the sequence boundary and the sequence units. Wavelet analysis models can provide a meaningful guide to the research of sequence stratigraphy.

Key words: sequence stratigraphy, base level cycle, well log, Morlet wavelet, wavelet analysis model