Abstract：Due to the complex structure, the imaging accuracy of pre-stack time migration is not high in the SYS area, which results in a large difference between the actual drilled structure data and the structure data from seismic prediction. The gas reservoir of Dengying Formation in the GM area is restricted by geological conditions such as deep burial, strong heterogeneity and thin reservoir. Thus, fine reservoir prediction is difficult, and the high-quality reservoir drilling ratio is low. To improve the migration homing in the SYS area, this paper conducted high-precision anisotropic pre-stack depth migration. This technique fully considers the anisotropy of underground media and carries out pre-stack depth migration with accurate anisotropy parameters. With the ability to restore the underground structure to the exact position, it avoids the information loss of steeply inclined strata, improves the quality of seismic imaging, and reduces the structural exploration error. The success rate of drilling is thereby increased significantly. To improve the reservoir drilling ratio in the GM area, the paper suppressed the strong amplitude reflection at the bottom of the Cambrian System with the newly completed well and ongoing drilling well data. Moreover, it performed the high-resolution post-stack geostatistical inversion and multi-attribute fracture and cave prediction to adjust the drilling target and well trajectory in real time so that the well trajectory can be made along a high-quality reservoir. The results show that after the integrated tracking of drilling, seismic and geology, the structural depth error of the target zone of the deployment well decreases year by year, and increases are observed in the reservoir drilling ratio, the average testing production and the proportion of high-yield wells. This further confirms the importance of real-time tracking of well location.
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