The porosity derived from the multi-mineral model was used as a porosity input to guide the time-domain inversion of the NMR echo trains.
![techlog geophysics equations techlog geophysics equations](https://ars.els-cdn.com/content/image/1-s2.0-S2096249520300363-gr15.jpg)
Additionally, a multi-mineral petrophysical model was built for each eall from log measurements, omitting the core data. The method was blindly tested on three siliciclastic wells from the Oriente basin, and the results were compared with pore-size analysis from mercury-injection and capillary-pressure data. In certain carbonate reservoirs in the Middle East, the distribution of pore size classes can be accurately determined by fitting the NMR pulse echoe. We used core data from three wells in the U and Hollin formations to validate a new nuclear magnetic resonance (NMR) spectral analysis technique, applied in the echo domain, to estimate the pore-size distribution. It is a major challenge to characterize and classify reservoir type and heterogeneity in reservoirs with pore-size variations using only well log data. Therefore, understanding pore size distribution can greatly enhance the success of a well. Results from recent extensive coring of the U and Hollin formations showed that the pore size significantly affects oil saturation and production. The three main oil-bearing Cretaceous formations in the basin are the Hollin, T and U formations.
![techlog geophysics equations techlog geophysics equations](https://www.mdpi.com/energies/energies-14-06228/article_deploy/html/images/energies-14-06228-g010.png)
![techlog geophysics equations techlog geophysics equations](http://www.crackcad.com/wp-content/uploads/2020/07/img_5f031adc58ff2.png)
In 2012, daily oil production reached 505,000 barrels. The "Oriente" basin is located in eastern Ecuador between the Andes Mountains and the Amazon rainforest.