Research and Application of Fine Horizon Calibration Technology in the Kelasu Area

Seismic horizon calibration is the foundation of seismic data interpretation and seismic reservoir research. The commonly used methods for horizon calibration include geological outcrops, VSP logging, and artificial synthetic records. The regional thick gypsum salt rock cover in the Kelasu thrust belt of the Kuqa Depression limits the breakthrough of structural thrusts, effectively protects reservoirs, and efficiently preserves oil and gas, which is an important guarantee for the enrichment of oil and gas under salt. However, due to the expansion of salt rocks and special geophysical properties, especially in the absence of density data, the correlation between synthetic seismic records and well side track records is poor, making it difficult to calibrate layers. In the practical work of seismic interpretation of salt bearing strata, especially in the prediction of sand bodies under salt reservoirs, the quality of synthetic seismic record production directly determines the accuracy of layer calibration, and further affects the reliability of seismic lithology prediction. This article proposes several insights on how to produce seismic synthetic records for precise layer calibration in the Kelasu gypsum salt rock development area, effectively solving the problem of fine structural interpretation and reservoir description in the salt dome development area, and improving the accuracy of underlying structural interpretation in the irregular development area of salt rock layers.