System and method for sweet zone identification in shale gas reservoirs
US8626447B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 2010 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Apr 15, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A computer system and computer implemented method for automatically identifying a hydrocarbon (such as kerogen, gas, oil) rich zone in a well bore includes obtaining well log data comprising neutron data, density data, radioactivity data, and resistivity data representative of physical characteristics of a formation surrounding the well bore and computing an apparent neutron porosity and an apparent density porosity based on the neutron data and density data. A normalized neutron-density separation is computed based on the computed apparent neutron porosity and the computed apparent density porosity and a baseline of the formation is determined for each data type. Using the computed normalized neutron-density separation, the radioactivity data, the resistivity data, and the determined baselines, the presence or absence of a hydrocarbon rich zone is determined. A quality index may further be derived from the data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.