Abstract
A target-oriented, predrill, pore-pressure prediction method using seismically estimated acoustic impedance is applied to recently acquired and processed dual-coil data in the Green Canyon and Walker Ridge areas of the Gulf of Mexico. Three deepwater subsalt wells are used in the study. One was used as a calibration well, and the other two were used as blind wells for comparing prediction results with the measured pore-pressure and mud-weight data. All three wells are in the Green Canyon area, penetrating thick salt bodies. A new seismic-inversion method is used for inversion of seismic impedance. The pore-pressure method uses a direct transform of the inverse of acoustic impedance, with two adjustable parameters. The optimization of the parameters is done through an iterative process to match the pore-pressure gradient obtained from the well acoustic impedance with those of pore-pressure measurements and mud weights within a tolerable range of those data for the calibration well. The optimized parameters are then used to transform the seismic acoustic-impedance volume to pore-pressure gradient volume. The predicted pore pressure at the blind wells from the well impedance and seismic impedance match reasonably with well data.
Publisher
Society of Exploration Geophysicists
Reference23 articles.
1. BakulinA., WoodwardM., ZdravevaO., and NicholsD., 2010, Application of steering filters to localized anisotropic tomography with well data: 80th Annual International Meeting, SEG, Expanded Abstracts, 4286–4290, http://dx.doi/org/10.1190/1.3513765.
2. BanikN., KoesoemadinataA., WagnerC., InyangC., and BuiH., 2013, Predrill pore-pressure prediction directly from seismically derived acoustic impedance: 83rd Annual International Meeting, SEG, Expanded Abstracts, 2905–2909, http://dx.doi.org/0.1190/segam2013-0137.1.
3. BowersG. L., 1994, Pore-pressure estimation from velocity data: Accounting for overpressure mechanisms besides undercompaction: IADC/SPE Drilling Conference Proceedings, 515–528, SPE 27488.
4. BrownM. P., and HigginbothamJ. H., 2009, Sub-salt overpressure detection before drilling using wave equation migration technologies: 79th Annual International Meeting, SEG, Expanded Abstracts, 1800–1804, http://dx.doi.org/10.1190/1.3255202.
5. Incorporation of geology with rock physics enables subsalt poststack inversion: A case study in the Gulf of Mexico
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献