Nuclear magnetic resonance and saturation well logs for determining free water level and reservoir type
US10190999B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2016 |
| Grant date | Jan 29, 2019 |
| Priority date | — |
| Expiry date | Apr 27, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A90/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided in some embodiments are systems and methods for determining characteristics of a hydrocarbon reservoir. Embodiments include conducting a nuclear magnetic resonance (NMR) logging operation of a targeted reservoir section of a wellbore extending into a hydrocarbon reservoir to generate a NMR log of the targeted reservoir section, conducting a resistivity logging of the targeted reservoir section to generate an uninvaded water saturation (Sw) log of the targeted reservoir section, determining for each of a plurality of depths in the section, a T2 cutoff point based on values of the NMR and Sw logs, identifying a subset of the T2 cutoff points that exhibit a hyperbolic trend, determining a theoretical cutoff curve corresponding to the subset of the T2 cutoff points, determining a free water level (FWL) of the reservoir based on the theoretical cutoff curve, and determining a rock type of the reservoir based on the theoretical cutoff curve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.