Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO Attribute
The presence of gas hydrate and associated gas in the Makran Accretionary Prism, offshore Iran, has been confirmed by various seismic indicators, including the bottom-simulating reflector (BSR), amplitude blanking, and bright spot. The pre-stack analysis and the study of amplitude-variation-with-off...
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| Format: | Article |
| Language: | English |
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Reaserch Institute of Petroleum Industry
2018-07-01
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| Series: | Journal of Petroleum Science and Technology |
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| Online Access: | https://jpst.ripi.ir/article_886_ef75843790b8b57adbf149c64d078520.pdf |
| _version_ | 1818201059202433024 |
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| author | Effat Behboudi Nasser Keshavarz Asghar Naderi |
| author_facet | Effat Behboudi Nasser Keshavarz Asghar Naderi |
| author_sort | Effat Behboudi |
| collection | DOAJ |
| description | The presence of gas hydrate and associated gas in the Makran Accretionary Prism, offshore Iran, has been confirmed by various seismic indicators, including the bottom-simulating reflector (BSR), amplitude blanking, and bright spot. The pre-stack analysis and the study of amplitude-variation-with-offset (AVO) attributes are the most reliable tools for semi-quantitative study of gas hydrate and free gas resources. Due to the lack of well data in the most regions of gas hydrate accumulations in deep oceans, the study of AVO attributes and application of seismic inversion techniques are solutions to evaluate both gas hydrate and the free gas trapped beneath it. Conventional seismic stacked data increases the signal-to-noise ratio; however, amplitude stretching in far offsets resulted in normal move-out (NMO), and Poisson’s error in velocity analysis decreases the frequency content of stack section. Moreover a stacked seismic data do not present a real zero-offset seismic data. In this study, the AVO intercept section was used to remove far offset effects and produce a more realistic zero-offset section with a high frequency content. Consequently, the acoustic impedance produced from the inverted intercept section shows acoustic property of the sediment in a better accuracy. According to the inverted section from AVO intercept data, free gas zone, and double bottom-simulating reflector, which identified about 50 ms below the first BSR, were observed with high vertical resolution.<br />. |
| first_indexed | 2024-12-12T02:47:32Z |
| format | Article |
| id | doaj.art-5b226c5309384d9295ae5355b24aacca |
| institution | Directory Open Access Journal |
| issn | 2251-659X 2645-3312 |
| language | English |
| last_indexed | 2024-12-12T02:47:32Z |
| publishDate | 2018-07-01 |
| publisher | Reaserch Institute of Petroleum Industry |
| record_format | Article |
| series | Journal of Petroleum Science and Technology |
| spelling | doaj.art-5b226c5309384d9295ae5355b24aacca2022-12-22T00:40:58ZengReaserch Institute of Petroleum IndustryJournal of Petroleum Science and Technology2251-659X2645-33122018-07-0183425210.22078/jpst.2017.2642.1449886Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO AttributeEffat Behboudi0Nasser Keshavarz1Asghar Naderi2Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Islamic Republic of Iran.Exploration and Production Research Center, Research Institute of Petroleum Industry, Tehran, Islamic Republic of Iran.Department of Geophysics, Exploration Directorate, National Iranian Oil Company, Tehran, Islamic Republic of IranThe presence of gas hydrate and associated gas in the Makran Accretionary Prism, offshore Iran, has been confirmed by various seismic indicators, including the bottom-simulating reflector (BSR), amplitude blanking, and bright spot. The pre-stack analysis and the study of amplitude-variation-with-offset (AVO) attributes are the most reliable tools for semi-quantitative study of gas hydrate and free gas resources. Due to the lack of well data in the most regions of gas hydrate accumulations in deep oceans, the study of AVO attributes and application of seismic inversion techniques are solutions to evaluate both gas hydrate and the free gas trapped beneath it. Conventional seismic stacked data increases the signal-to-noise ratio; however, amplitude stretching in far offsets resulted in normal move-out (NMO), and Poisson’s error in velocity analysis decreases the frequency content of stack section. Moreover a stacked seismic data do not present a real zero-offset seismic data. In this study, the AVO intercept section was used to remove far offset effects and produce a more realistic zero-offset section with a high frequency content. Consequently, the acoustic impedance produced from the inverted intercept section shows acoustic property of the sediment in a better accuracy. According to the inverted section from AVO intercept data, free gas zone, and double bottom-simulating reflector, which identified about 50 ms below the first BSR, were observed with high vertical resolution.<br />.https://jpst.ripi.ir/article_886_ef75843790b8b57adbf149c64d078520.pdfamplitude-variation-with-offset (avo)intercept attributegas hydratefree gasdouble bottom-simulating reflector (dbsr) |
| spellingShingle | Effat Behboudi Nasser Keshavarz Asghar Naderi Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO Attribute Journal of Petroleum Science and Technology amplitude-variation-with-offset (avo) intercept attribute gas hydrate free gas double bottom-simulating reflector (dbsr) |
| title | Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO Attribute |
| title_full | Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO Attribute |
| title_fullStr | Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO Attribute |
| title_full_unstemmed | Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO Attribute |
| title_short | Identification of Gas Accumulation Adjacent to the Gas Hydrate Bearing Zone by Inversion Utilizing AVO Attribute |
| title_sort | identification of gas accumulation adjacent to the gas hydrate bearing zone by inversion utilizing avo attribute |
| topic | amplitude-variation-with-offset (avo) intercept attribute gas hydrate free gas double bottom-simulating reflector (dbsr) |
| url | https://jpst.ripi.ir/article_886_ef75843790b8b57adbf149c64d078520.pdf |
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