Multiaxial well logging instrument response in dipping and crossbedded formations
US10444399B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2015 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Jul 15, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining resistivity of subsurface formations includes generating an initial model of the formations from multiaxial electromagnetic transimpedance measurements, the model comprising values of vertical resistivity, horizontal resistivity, crossbed dip, crossbed azimuth, and bedding dip and azimuth. Expected measurements generated from the initial model measurements are decomposed into ordinary and extraordinary components. The actual tool measurements are compared to the summation of the expected decomposed measurement components. The initial model is adjusted, the expected decomposed components are recalculated and the foregoing are repeated until the difference between the actual tool measurements and the summation of the expected decomposed components falls below a selected threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.