Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia
The objective of tills study is to discriminate between aeolian and fluvial deposits of the Permian Unayzah formation in Central Saudi Arabia by using wireline logs. The analysis is conducted on wire-line logs (field data): Density, sonic, gamma, and neutron, from two vertical wells (U1 and U2) i...
| Main Authors: | , , |
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| 其他作者: | |
| 格式: | Technical Report |
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Massachusetts Institute of Technology. Earth Resources Laboratory
2012
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| 在线阅读: | http://hdl.handle.net/1721.1/75723 |
| _version_ | 1826200928404897792 |
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| author | Al-Dajani, AbdulFattah Burns, Daniel Toksoz, M. Nafi |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Al-Dajani, AbdulFattah Burns, Daniel Toksoz, M. Nafi |
| author_sort | Al-Dajani, AbdulFattah |
| collection | MIT |
| description | The objective of tills study is to discriminate between aeolian and fluvial deposits of
the Permian Unayzah formation in Central Saudi Arabia by using wireline logs. The
analysis is conducted on wire-line logs (field data): Density, sonic, gamma, and neutron,
from two vertical wells (U1 and U2) in Central Saudi Arabia. Core data are available
at well location U1 but not at U2. We apply an automated neural-network method
to the wireline data for facies discrimination. Our analysis has been applied to the
logs of well U2 after training the method on U1 logs using available core information.
Results indicate that the Unayzah formation at well location U2 consists mainly of
fluvial deposits (about 90%), which is consistent with previous studies and is supported
by surface seismic images.
We also investigate an analysis method based On the Fourier transform. We study
the decay of the energy spectrum in the frequency domain and estimate the associated
power-law exponent (i.e., the slope of the decay) for each depositional system. Analysis
on the porosity logs (density, neutron, sonic, and shear), which are highly influenced by
deposition composition and texture, has shown that the exponent is about the same for
fluvial deposits at both well locations, while it is different for aeolian deposits. |
| first_indexed | 2024-09-23T11:43:56Z |
| format | Technical Report |
| id | mit-1721.1/75723 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:43:56Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/757232019-04-10T23:57:25Z Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia Al-Dajani, AbdulFattah Burns, Daniel Toksoz, M. Nafi Massachusetts Institute of Technology. Earth Resources Laboratory Al-Dajani, AbdulFattah Burns, Daniel Toksoz, M. Nafi The objective of tills study is to discriminate between aeolian and fluvial deposits of the Permian Unayzah formation in Central Saudi Arabia by using wireline logs. The analysis is conducted on wire-line logs (field data): Density, sonic, gamma, and neutron, from two vertical wells (U1 and U2) in Central Saudi Arabia. Core data are available at well location U1 but not at U2. We apply an automated neural-network method to the wireline data for facies discrimination. Our analysis has been applied to the logs of well U2 after training the method on U1 logs using available core information. Results indicate that the Unayzah formation at well location U2 consists mainly of fluvial deposits (about 90%), which is consistent with previous studies and is supported by surface seismic images. We also investigate an analysis method based On the Fourier transform. We study the decay of the energy spectrum in the frequency domain and estimate the associated power-law exponent (i.e., the slope of the decay) for each depositional system. Analysis on the porosity logs (density, neutron, sonic, and shear), which are highly influenced by deposition composition and texture, has shown that the exponent is about the same for fluvial deposits at both well locations, while it is different for aeolian deposits. Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium Massachusetts Institute of Technology. Earth Resources Laboratory. Reservoir Delineation Consortium 2012-12-13T19:29:20Z 2012-12-13T19:29:20Z 2000 Technical Report http://hdl.handle.net/1721.1/75723 Earth Resources Laboratory Industry Consortia Annual Report;2000-12 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Al-Dajani, AbdulFattah Burns, Daniel Toksoz, M. Nafi Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia |
| title | Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia |
| title_full | Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia |
| title_fullStr | Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia |
| title_full_unstemmed | Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia |
| title_short | Aeolian And Fluvial Depositional Systems Discrimination In Wireline Logs: Unayzah Formation, Central Saudi Arabia |
| title_sort | aeolian and fluvial depositional systems discrimination in wireline logs unayzah formation central saudi arabia |
| url | http://hdl.handle.net/1721.1/75723 |
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