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Title

Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance

Year: 1399
COI: JR_IJOGST-9-3_007
Language: EnglishView: 19
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Authors

Hessam MansouriSiahgoli - Ph.D. Candidate, Institute of Geophysics, University of Tehran, Tehran, Iran
Mohammad Ali Riahi - Professor, Institute of Geophysics, University of Tehran, Tehran, Iran
Bahare Heidari - M.S. Student, Institute of Geophysics, University of Tehran, Tehran, Iran
Reza Mohebian - Geophysics Expert, KPE Co., Tehran, Iran

Abstract:

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.

Keywords:

Extended Elastic Impedance, Inversion, Carbonate Reservoirs, Gas-bearing

Paper COI Code

This Paper COI Code is JR_IJOGST-9-3_007. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/1230055/

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MansouriSiahgoli, Hessam and Riahi, Mohammad Ali and Heidari, Bahare and Mohebian, Reza,1399,Identifying Gas-bearing Carbonate Reservoir Using Extended Elastic Impedance,https://civilica.com/doc/1230055

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