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Avoid Sub-salt Overpressure!
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Exploration Managers: do you like to blow through your well budget without
ever reaching the target? If so, then you don't need WIT Detect, our
wide-area, pre-drill overpressure detection service. If you are
interested in saving millions of dollars by avoiding overpressure, read on.
WIT Detect is a two-phase program which complements more expensive, VSP-based overpressure detection schemes. Phase 1 is a relatively fast and inexpensive way to get a wide-area overpressure attribute just under the base of salt. What's better, Phase 1 does not require any field data tape copy - just provide us with one or more images and we will use it to derive an overpressure attribute. Phase 2 uses our patent-pending Migration Velocity Focusing Analysis to measure velocity under salt, which is an overpressure attribute.
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WIT Detect Phase 1...
Upshot: Rapid, flexible, cost-effective, large-scale overpressure attribute |
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WIT Detect Phase 2...
Some key prerequisites must be satisfied for Phase 2 to give optimal results. WIT tests these prerequisites in the Phase 1 simulation and imaging study. You'll know before we start if your study area is not a candidate for Phase 2. Upshot: You can measure velocity below salt! Like having a virtual sonic log over your potential drill paths. |
The velocity and density of salt are known. If the density of sediments
just below salt is also known, then at normal incidence, base of salt
amplitude depends only on sub-salt velocity. However, complex
focusing induced by the salt geometry can lead to false overpressure
signatures. Using your "best" migration velocity model, which should be
accurate to the base of salt, with a simple trend below salt, WIT uses
a 
Phase 1 of WIT Detect lets you zero in on a likely family of base of salt
penetration points. Phase 2 measures the actual velocity below salt,
using WIT's patent-pending