Pore pressure prediction method and system for fine-grained hybrid sedimentary rock based on variable p-wave velocity
US12332398B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2024 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Dec 5, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V11/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pore pressure prediction method for fine-grained hybrid sedimentary rock based on variable P-wave velocity includes: carrying out a P-wave velocity test of rock under different effective stresses, determining a function form of the relationship between acoustic velocity and effective stress, fitting the parameters in the function by optimization, and establishing an evaluation model of effective stress influence term by lithology. According to the measured formation pressure data and the effective stress influence term model, the acoustic velocity background value is deduced, the logging curve is preferred, and the acoustic velocity background value logging evaluation model is established. According to the logging curves of DT and DEN, combined with the lithology identification results, the acoustic velocity background value is calculated, and then the effective stress of the formation is obtained, and then the pore pressure is determined according to the overburden pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.