Application of Pre-stack Depth Migration Technology for Optimization of Well location Target in Complicated Faulted Block Structure

Abstract

Abstract: Faulted blocks developed in the narrow Yunanchang structure in East Sichuan Basin. The drilling results show a substantial deviation between structural axis and pre-stack time migration. With the Kirchhoff pre-stack depth migration technology used, the accurate velocity-depth model is established, while reasonable migration aperture is chosen, to make PSDM in this region. The characteristics of structural shape and boundaries of main faults are clear on the PSDM profile while the breakpoints of faults are reliable and accurate, significantly improving imaging resolution of the target layers. Drilling and logging data are used to accurately calibrate and correct the PSDM imaging depth. The structural map is revised on the basis of the PSDM results, thus identifying the next drilling target. The drilling results after adjustment of target are in line with the PSDM structural elements, providing valuable references for optimization of the follow-up well location targets.

References

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