| Autor: |
Sayers, Colin M., den Boer, Lennert, Nagy, Zsolt, Hooyman, Patrick, Ward, Victor |
| Předmět: |
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| Zdroj: |
World Oil; Dec2005, Vol. 226 Issue 12, p55-58, 4p, 8 Color Photographs, 2 Diagrams, 4 Graphs |
| Abstrakt: |
The article reports that a pore pressure cube built over the entire northern Gulf of Mexico using data released by the U.S. Minerals Management Service substantially reduces the time needed for pore pressure prediction projects in this area. Knowing pore pressure is becoming increasingly essential for drilling in depleted, deep or overpressured zones. Pre-drill, pore pressure can be predicted using fit-for-purpose seismic velocities with a velocity-to-pore pressure transform calibrated to offset wells. All released checkshots for the Gulf of Mexico were inverted for velocity versus depth below mudline, then kriged to populate a 3D Mechanical Earth Model with both velocity and expected uncertainty. The 3D velocity cube thus obtained was used to infer regional variations in overpressure. This refinement process continues with data acquired while drilling, which allows the uncertainty in pore pressure prediction ahead of the bit to be reduced ahead of the drill-bit. Pore pressure can be predicted from seismic velocities via a velocity-to-pore pressure transform calibrated to offset wells |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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