Self-consistent log interpretation method
US4916616A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1986 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Dec 8, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Responses of subsurface formations adjacent a well borehole are obtained from a number of types of well logs. The well logs typically include a resistivity log, a gamma ray log, a density log, a neutron log and an induction or electromagnetic wave log. Parameters of interest are determined in evaluating whether the subsurface formations are of interest for petroleum contents by a non-linear programming technique based on the log responses obtained. The parameters of interest are maintained self-consistent, i.e. their contribution to log measurements is based on the same value for the parameter in its effect on each log in which they produce a response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.