Abstract
According to the reservoir and structural characteristics of Heidimiao, this paper combines fine pre-stack pre-processing and small-panel pre-stack time migration, and optimizes targeted methods and parameters to obtain the seismic data with higher resolution and better amplitude retention. Compared with the previous processing results, the migration imaging of the new data has been improved, and the geological phenomenon of the whole area is clear. The fracture system is reasonable, the fracture points are crisp, and the imaging of small faults is clear. The wave group characteristics of the new treatment are obvious, and the transverse resolution, longitudinal resolution and signal-to-noise ratio are improved obviously. By using relative amplitude preserving and VTI pre-stack time migration, the signal to noise ratio and resolution of seismic processing results have been greatly improved, and the interlayer information is more abundant, which can meet the needs of target interpretation.
Highlights
In seismic exploration, the phenomenon that the position of the reflection point of the stratum with a certain dip shown on the horizontal superimposed section deviates from the true position of the underground reflection point is called offset
In Kirchhoff integral prestack migration imaging, the imaging point underground is usually regarded as a possible diffraction point, and the travel time and amplitude factor from the source point to the imaging point and to the receiving point are calculated by the ray theory under the condition of high frequency approximation, and the seismic trace within the set aperture is superpositioned according to the calculated travel time and amplitude factor
(2) Comparing the time slices of the pre-stack time migration and post-stack time migration profiles, it can be seen that the signal-to-noise ratio of the pre-stack time migration profile is relatively high, the wave group characteristics are relatively clear, the inter-layer information is rich, and the diffraction wave Convergence in place, the imaging of cross-sections and steep dip angles is clearer
Summary
The phenomenon that the position of the reflection point of the stratum with a certain dip shown on the horizontal superimposed section deviates from the true position of the underground reflection point is called offset. The offset location of seismic section is to locate the offset reflection layer on the horizontal superposition section, so as to restore the true shape of the underground reflection layer, which is often called "migration"[1]. In specific exploration practice, when the formation is flat, horizontal stacking can meet the requirements; when the formation is steep, the overlap of the common center point causes the reflection point to be blurred, and the pre-stack migration can achieve true common reflection point imaging. The prestack time migration is the best choice when the lateral velocity variation is small and the underground structure is complex. Prestack depth migration is more suitable for complex structure and large lateral variation of velocity field. In order to solve this problem, the imaging technology of anisotropic medium wave field is introduced
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