Furkejuvvon:
| Váldodahkkit: | , , |
|---|---|
| Materiálatiipa: | Recurso digital |
| Giella: | eaŋgalasgiella |
| Almmustuhtton: |
Zenodo
2025
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| Fáttát: | |
| Liŋkkat: | https://doi.org/10.5281/zenodo.16814533 |
| Fáddágilkorat: |
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Sisdoallologahallan:
- <p><span>This study focuses on the importance of accurately determining the T2 cutoff value, a crucial<br>petrophysical parameter that differentiates movable fluid from immovable fluid in formations. Standard T2<br>cutoff values (33 ms for sandstones, 100/200 ms for carbonates) may not apply uniformly across a column,<br>leading to discrepancies in saturation determination. Accurate T2 cutoff determination, typically done in the<br>lab, is time-consuming and expensive. The goal of this study is to correlate T2 cutoff to the T1/T2 ratio and<br>saturation using NMR data alone. Cores from sandstones and carbonates were used and NMR T2 and T1T2<br>measurements were performed at various water saturations for each core sample. The findings show average<br>cutoff values of 119 ms for carbonates and 26 ms for sandstones. Correlations were established between T2<br>cutoff and water saturation, T2 cutoff and T1/T2 ratio, and T1/T2 ratio with water saturation. These<br>correlations, based solely on NMR data, can be applied to logs when T2 cutoff data from cores is<br>unavailable. The study demonstrates strong correlations between T2 cutoff, irreducible water saturations,<br>and the T1/T2 log mean ratio, confirming the relevance and applicability of these correlations for downhole<br>data.</span> </p>