Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance
It is difficult to identify the carbonate reservoirs by using conventional seismic reflection data, especially in cases where the reflection coefficient of the gas-bearing zone is close to that of the carbonate background. In such cases, the extended elastic impedance (EEI) as a seismic reconnaissan...
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Petroleum University of Technology
2020-07-01
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| Series: | Iranian Journal of Oil & Gas Science and Technology |
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| Online Access: | http://ijogst.put.ac.ir/article_115495_c6f723e5e1f9a8043f5a99dbc2afefa3.pdf |
| _version_ | 1819005773068369920 |
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| author | Hessam MansouriSiahgoli Mohammad Ali Riahi Bahare Heidari Reza Mohebian |
| author_facet | Hessam MansouriSiahgoli Mohammad Ali Riahi Bahare Heidari Reza Mohebian |
| author_sort | Hessam MansouriSiahgoli |
| collection | DOAJ |
| description | It is difficult to identify the carbonate reservoirs by using conventional seismic reflection data, especially in cases where the reflection coefficient of the gas-bearing zone is close to that of the carbonate background. In such cases, the extended elastic impedance (EEI) as a seismic reconnaissance attribute with the ability to predict fluids and lithology can be used. It allows for a better distinction between seismic anomaly caused by lithology and the one caused by the fluid content. The EEI attribute extends the available reflection angles and applies different weights to the intercept and gradient values so as to extract the petrophysical properties of the rock at a specific incident angle. Using the EEI attribute, we can estimate the elastic parameters such as shear impedance; the ratio of the compressional velocity to shear velocity; Poisson’s ratio; and bulk, Lame, and shear moduli, and petrophysical properties, including porosity, clay content, and water saturation. The known reservoirs in the study area are three oil-bearing formations namely, Surmeh (Arab), Gadvan (Buwaib), and Dariyan (Shuaiba), and three gas-bearing formations, including Kangan, Dalan, and Faraghan. The Dehram group is composed of Kangan (Triassic), Dalan, and Faraghan (Permian) formations. Permian carbonates of Kangan–Dalan and its equivalent Khuff have regionally been developed as a thick carbonate sequence in the southern Persian Gulf region. In this paper, parameters 𝜆𝑝 and 𝜇𝜌 extracted from the EEI method are used to characterize a carbonate reservoir. Our results show that the EEI can highlight the difference between the reservoir and non-reservoir formation to identify the gas-bearing areas. |
| first_indexed | 2024-12-20T23:58:07Z |
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| issn | 2345-2412 2345-2420 |
| language | English |
| last_indexed | 2024-12-20T23:58:07Z |
| publishDate | 2020-07-01 |
| publisher | Petroleum University of Technology |
| record_format | Article |
| series | Iranian Journal of Oil & Gas Science and Technology |
| spelling | doaj.art-c8891d9d2cd545bc8701783f38d3b8f82022-12-21T19:22:40ZengPetroleum University of TechnologyIranian Journal of Oil & Gas Science and Technology2345-24122345-24202020-07-019310211510.22050/ijogst.2020.218837.1535115495Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic ImpedanceHessam MansouriSiahgoli0Mohammad Ali Riahi1Bahare Heidari2Reza Mohebian3Ph.D. Candidate, Institute of Geophysics, University of Tehran, Tehran, IranProfessor, Institute of Geophysics, University of Tehran, Tehran, IranM.S. Student, Institute of Geophysics, University of Tehran, Tehran, IranGeophysics Expert, KPE Co., Tehran, IranIt is difficult to identify the carbonate reservoirs by using conventional seismic reflection data, especially in cases where the reflection coefficient of the gas-bearing zone is close to that of the carbonate background. In such cases, the extended elastic impedance (EEI) as a seismic reconnaissance attribute with the ability to predict fluids and lithology can be used. It allows for a better distinction between seismic anomaly caused by lithology and the one caused by the fluid content. The EEI attribute extends the available reflection angles and applies different weights to the intercept and gradient values so as to extract the petrophysical properties of the rock at a specific incident angle. Using the EEI attribute, we can estimate the elastic parameters such as shear impedance; the ratio of the compressional velocity to shear velocity; Poisson’s ratio; and bulk, Lame, and shear moduli, and petrophysical properties, including porosity, clay content, and water saturation. The known reservoirs in the study area are three oil-bearing formations namely, Surmeh (Arab), Gadvan (Buwaib), and Dariyan (Shuaiba), and three gas-bearing formations, including Kangan, Dalan, and Faraghan. The Dehram group is composed of Kangan (Triassic), Dalan, and Faraghan (Permian) formations. Permian carbonates of Kangan–Dalan and its equivalent Khuff have regionally been developed as a thick carbonate sequence in the southern Persian Gulf region. In this paper, parameters 𝜆𝑝 and 𝜇𝜌 extracted from the EEI method are used to characterize a carbonate reservoir. Our results show that the EEI can highlight the difference between the reservoir and non-reservoir formation to identify the gas-bearing areas.http://ijogst.put.ac.ir/article_115495_c6f723e5e1f9a8043f5a99dbc2afefa3.pdfextended elastic impedanceinversioncarbonate reservoirsgas-bearing |
| spellingShingle | Hessam MansouriSiahgoli Mohammad Ali Riahi Bahare Heidari Reza Mohebian Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance Iranian Journal of Oil & Gas Science and Technology extended elastic impedance inversion carbonate reservoirs gas-bearing |
| title | Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance |
| title_full | Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance |
| title_fullStr | Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance |
| title_full_unstemmed | Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance |
| title_short | Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance |
| title_sort | identifying gas bearing carbonate reservoir using extended elastic impedance |
| topic | extended elastic impedance inversion carbonate reservoirs gas-bearing |
| url | http://ijogst.put.ac.ir/article_115495_c6f723e5e1f9a8043f5a99dbc2afefa3.pdf |
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