Method of generating subsurface characteristics models
US4314339A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1979 |
| Grant date | Feb 2, 1982 |
| Priority date | — |
| Expiry date | Mar 12, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with the well logging device. A set of actual measurement values which represent readings taken over a given depth interval of the well is derived. An initial trial model of the subsurface characteristic under investigation is then selected. The model includes discretely-boundaried beds, the location of boundaries being based on subsurface characteristic data. A simulated measurement value at a particular depth level is generated by applying the approximate response characteristic of the logging device to the model. The simulated measurement value at the particular depth level is compared to the actual measurement value at that depth level and the model is then modified in accordance with the comparison. In a preferred embodiment of the invention, the location of model boundaries are determined by computing the variance of subsurface characteristic data and then selecting model boundaries at local maxima of the variance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.