Full text loading...
-
Quantitative estimation of oil saturation from marine CSEM data: a case history
- Source: First Break, Volume 29, Issue 2, Feb 2011,
-
- 01 Feb 2011
Abstract
We use a real dataset to show, firstly, how unconstrained inversion of marine controlled source electromagnetic (CSEM) data can provide useful indications for estimating hydrocarbon saturation. Then we show that when constrained inversion is applied, more precise quantitative indications can be obtained. To constrain the inversion satisfactorily, porosity must be accurately estimated by independent methods and the relationship between resistivity, porosity, and saturation, whether Archie’s law or some other relationship, must be properly parameterized. By such constrained inversion, CSEM surveys can be used for quantitative reservoir characterization and the average hydrocarbon saturation in the reservoir can be estimated with reasonable accuracy.