Pore pressure prediction method and device
By calculating the longitudinal wave velocity of the rock when the effective pressure is zero and the effective pressure of the actual rock, combined with the overlying layer pressure, the pore pressure is accurately calculated, and the existing model solves the problems of prediction deviation and application conditions when dealing with rock development of secondary pores, and improves the accuracy of pore pressure prediction.
Patent Information
- Application Number
- CN202311264332.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2043-09-27
AI Technical Summary
When the existing pore pressure prediction model deals with rocks with dominant chemical compaction and secondary pore development, the prediction results are very different from the actual drilling, and the application conditions are harsh, which can easily lead to large errors.
By calculating the longitudinal wave velocity of the rock when the effective pressure is zero, combining the longitudinal wave velocity when the micro-fissure is closed and the pressure when the soft hole is closed, the effective pressure of the actual rock is calculated using the longitudinal wave velocity and preset coefficients measured by the well logging, and the pore pressure is calculated based on the overlying layer pressure and effective pressure.
This method can accurately predict pore pressure, improve the prediction accuracy of the formation pressure of complex pore reservoirs, and is suitable for dense sandstone and carbonate reservoirs with highly developed secondary pores, avoiding the problem of cumbersome calculation of classical models and the prediction accuracy is restricted by compaction trend accuracy.