Calculation of porosity by combining the nuclear magnetic resonance and sonic logs in gas bearing reservoir at Sienna Field of WDDM concession in Egypt
Author's Department
Petroleum & Energy Engineering Department
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https://doi.org/10.5829/idosi.wasj.2014.30.12.14238
Document Type
Research Article
Publication Title
World Applied Sciences Journal
Publication Date
1-1-2014
doi
10.5829/idosi.wasj.2014.30.12.14238
Abstract
The estimated porosity may be inaccurate when calculated from conventional logs (unless corrected for gas and shale effect) and also underestimated when derived from nuclear magnetic resonance (NMR) logs due to the effect of the lower hydrogen index of natural gas in gas-bearing sandstones. A technique of calculating porosity by combining the NMR log with the conventional interval transit time log is proposed and it is based on principle of NMR log and the results obtained from a physical rock volume model which constructed on the basis of interval transit time logs. For wells with the NMR log acquired from the MRIL-C tool, this technique is reliable for evaluating the effect of natural gas and obtaining accurate porosity in any borehole. The NMR porosity should be first corrected by using the deep lateral resistivity log in wells with NMR log acquired from the CMR-Plus tool and with collapsed borehole. Two field examples of tight gas sandstones, in the studied concession, illustrate that the porosity calculated by using this technique matches the core analyzed results very well. Another field example, in this paper, of conventional gas-bearing reservoir (Sienna Field), verifies that this technique is usable not only in tight gas sandstones, but also in any gas-bearing reservoirs. This study is applied on a well in Sienna Field which is located in the west delta deep marine concession (WDDM). © IDOSI Publications, 2014.
First Page
1801
Last Page
1807
Recommended Citation
APA Citation
Noah, A. Z.
&
Shazly, T.
(2014). Calculation of porosity by combining the nuclear magnetic resonance and sonic logs in gas bearing reservoir at Sienna Field of WDDM concession in Egypt. World Applied Sciences Journal, 30(12), 1801–1807.
10.5829/idosi.wasj.2014.30.12.14238
https://fount.aucegypt.edu/faculty_journal_articles/1869
MLA Citation
Noah, Ahmed, et al.
"Calculation of porosity by combining the nuclear magnetic resonance and sonic logs in gas bearing reservoir at Sienna Field of WDDM concession in Egypt." World Applied Sciences Journal, vol. 30,no. 12, 2014, pp. 1801–1807.
https://fount.aucegypt.edu/faculty_journal_articles/1869