Abstract:Inside the deep metamorphic buried hill in the BZ-A condensate gas field,conventional seismic data based on reflected wave processing has a low signal-to-noise ratio and poor imaging quality. Thus, it is difficult to effectively predict the distribution of inner fractured reservoirs. Scattered wave field information can describe the underground heterogeneous geological bodies,which can well indicate the development of cracks and faults inside a buried hill. In view of this,the paper proposes a pre-stack scattered wave separation method based on mathematical morphological filtering. Through a pre-stack common-offset gather analysis, the difference between the morphological characteristics of the scattered wave and the reflected wave is determined, namely the time-distance relationship difference, and this difference is used to construct linear structural elements. Then, the reflected wave is obtained by morphological filtering in the spatial direction, and the scattered wave is obtained by subtracting the reflected wave from the original wave field. The model test results show that the pre-stack scattered wave separation method based on morphological filtering achieves a relatively complete scattered wave field with high precision and effectively enhances the imaging quality of complex geological bodies. The application of field data shows that the scattered wave imaging results improve the characterization effect of fractured reservoirs inside buried hills and provide technical support for the deployment of well locations in the BZ-A condensate gas field.
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