Study of a fractured reservoir by using the anisotropy of seismic wave attenuation

Fateh Bouchaala; Mohammed Y. Ali; Jun Matsushima; Youcef Bouzidi; Eric M. Takam Takougang; Aala A.I. Mohamed

doi:10.1190/segam2019-3214834.1

Study of a fractured reservoir by using the anisotropy of seismic wave attenuation

Fateh Bouchaala, Mohammed Y. Ali, Jun Matsushima, Youcef Bouzidi, Eric M. Takam Takougang, Aala A.I. Mohamed

Earth Science

University of Tokyo

Research output: Contribution to conference › Paper › peer-review

Abstract

The dense geometry of a 3D VSP survey which was carried out in an oilfield located in the Emirate of Abu Dhabi, United Arab Emirates, enables us to perform high resolution azimuthal study of seismic wave attenuation, in order to investigate a fractured reservoir in the oilfield. We obtained the orientation of fractures in three reservoir units by using the concept suggesting that the strike direction of fractures corresponds to the azimuth of the minimum attenuation f₀ . We defined f₀ as the azimuth of the minimum attenuation Q-¹ that we estimated at several azimuths and offsets by using the spectral ratio method. The rose diagrams gathering f₀ obtained at several offsets, are in agreement with those gathering the strike direction of open and cemented fractures, obtained from cores interpretation. This is due to the fact that the attenuation Q-¹ is caused by a combination of scattering and fluid-related mechanisms. It is physical evidence that fractures, regardless their type, are an important source of scattering mechanism, and also of fluid-related mechanisms if they are open. Another way to define f₀ is by using a cosine least square fitting of azimuthal variation of the relative attenuation ?Q-¹ , that we estimated at several azimuths and offsets by using a modified spectral ratio method. In this case, the rose diagrams gathering f₀ defined at several offsets, are in agreement with those gathering strike direction of open fractures obtained from cores and Full-bore Formation Microimager interpretation. This agreement is due to the fact that the cosine least square fitting is based on the squirt flow mechanism that is caused by fluid movement between grain pores and fractures. Accordingly, comparison between the rose diagrams of f₀ estimated by using the two approaches, can be a good way to separate between open and cemented fractures. Such, finding is very interesting for petroleum industry and can help in Enhanced Oil Recovery (EOR) studies.

Original language	British English
Pages	338-342
Number of pages	5
DOIs	https://doi.org/10.1190/segam2019-3214834.1
State	Published - 2020
Event	Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019 - San Antonio, United States Duration: 15 Sep 2019 → 20 Sep 2019

Conference

Conference	Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
Country/Territory	United States
City	San Antonio
Period	15/09/19 → 20/09/19

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1190/segam2019-3214834.1

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Bouchaala, F., Ali, M. Y., Matsushima, J., Bouzidi, Y., Takam Takougang, E. M., & Mohamed, A. A. I. (2020). Study of a fractured reservoir by using the anisotropy of seismic wave attenuation. 338-342. Paper presented at Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019, San Antonio, United States. https://doi.org/10.1190/segam2019-3214834.1

@conference{f82ceee9d5e94fdea8d2830c43c3a9f1,

title = "Study of a fractured reservoir by using the anisotropy of seismic wave attenuation",

abstract = "The dense geometry of a 3D VSP survey which was carried out in an oilfield located in the Emirate of Abu Dhabi, United Arab Emirates, enables us to perform high resolution azimuthal study of seismic wave attenuation, in order to investigate a fractured reservoir in the oilfield. We obtained the orientation of fractures in three reservoir units by using the concept suggesting that the strike direction of fractures corresponds to the azimuth of the minimum attenuation f0 . We defined f0 as the azimuth of the minimum attenuation Q-1 that we estimated at several azimuths and offsets by using the spectral ratio method. The rose diagrams gathering f0 obtained at several offsets, are in agreement with those gathering the strike direction of open and cemented fractures, obtained from cores interpretation. This is due to the fact that the attenuation Q-1 is caused by a combination of scattering and fluid-related mechanisms. It is physical evidence that fractures, regardless their type, are an important source of scattering mechanism, and also of fluid-related mechanisms if they are open. Another way to define f0 is by using a cosine least square fitting of azimuthal variation of the relative attenuation ?Q-1 , that we estimated at several azimuths and offsets by using a modified spectral ratio method. In this case, the rose diagrams gathering f0 defined at several offsets, are in agreement with those gathering strike direction of open fractures obtained from cores and Full-bore Formation Microimager interpretation. This agreement is due to the fact that the cosine least square fitting is based on the squirt flow mechanism that is caused by fluid movement between grain pores and fractures. Accordingly, comparison between the rose diagrams of f0 estimated by using the two approaches, can be a good way to separate between open and cemented fractures. Such, finding is very interesting for petroleum industry and can help in Enhanced Oil Recovery (EOR) studies.",

author = "Fateh Bouchaala and Ali, {Mohammed Y.} and Jun Matsushima and Youcef Bouzidi and {Takam Takougang}, {Eric M.} and Mohamed, {Aala A.I.}",

note = "Funding Information: We would like to thank Abu Dhabi National Oil Company (ADNOC) for financial support of this project and for permission to use the data used in this project. Publisher Copyright: {\textcopyright} 2019 SEG; Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019 ; Conference date: 15-09-2019 Through 20-09-2019",

year = "2020",

doi = "10.1190/segam2019-3214834.1",

language = "British English",

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}

Bouchaala, F , Ali, MY, Matsushima, J, Bouzidi, Y, Takam Takougang, EM & Mohamed, AAI 2020, 'Study of a fractured reservoir by using the anisotropy of seismic wave attenuation', Paper presented at Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019, San Antonio, United States, 15/09/19 - 20/09/19 pp. 338-342. https://doi.org/10.1190/segam2019-3214834.1

Study of a fractured reservoir by using the anisotropy of seismic wave attenuation. / Bouchaala, Fateh ; Ali, Mohammed Y.; Matsushima, Jun et al.
2020. 338-342 Paper presented at Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019, San Antonio, United States.

Research output: Contribution to conference › Paper › peer-review

TY - CONF

T1 - Study of a fractured reservoir by using the anisotropy of seismic wave attenuation

AU - Bouchaala, Fateh

AU - Ali, Mohammed Y.

AU - Matsushima, Jun

AU - Bouzidi, Youcef

AU - Takam Takougang, Eric M.

AU - Mohamed, Aala A.I.

N1 - Funding Information: We would like to thank Abu Dhabi National Oil Company (ADNOC) for financial support of this project and for permission to use the data used in this project. Publisher Copyright: © 2019 SEG

PY - 2020

Y1 - 2020

N2 - The dense geometry of a 3D VSP survey which was carried out in an oilfield located in the Emirate of Abu Dhabi, United Arab Emirates, enables us to perform high resolution azimuthal study of seismic wave attenuation, in order to investigate a fractured reservoir in the oilfield. We obtained the orientation of fractures in three reservoir units by using the concept suggesting that the strike direction of fractures corresponds to the azimuth of the minimum attenuation f0 . We defined f0 as the azimuth of the minimum attenuation Q-1 that we estimated at several azimuths and offsets by using the spectral ratio method. The rose diagrams gathering f0 obtained at several offsets, are in agreement with those gathering the strike direction of open and cemented fractures, obtained from cores interpretation. This is due to the fact that the attenuation Q-1 is caused by a combination of scattering and fluid-related mechanisms. It is physical evidence that fractures, regardless their type, are an important source of scattering mechanism, and also of fluid-related mechanisms if they are open. Another way to define f0 is by using a cosine least square fitting of azimuthal variation of the relative attenuation ?Q-1 , that we estimated at several azimuths and offsets by using a modified spectral ratio method. In this case, the rose diagrams gathering f0 defined at several offsets, are in agreement with those gathering strike direction of open fractures obtained from cores and Full-bore Formation Microimager interpretation. This agreement is due to the fact that the cosine least square fitting is based on the squirt flow mechanism that is caused by fluid movement between grain pores and fractures. Accordingly, comparison between the rose diagrams of f0 estimated by using the two approaches, can be a good way to separate between open and cemented fractures. Such, finding is very interesting for petroleum industry and can help in Enhanced Oil Recovery (EOR) studies.

AB - The dense geometry of a 3D VSP survey which was carried out in an oilfield located in the Emirate of Abu Dhabi, United Arab Emirates, enables us to perform high resolution azimuthal study of seismic wave attenuation, in order to investigate a fractured reservoir in the oilfield. We obtained the orientation of fractures in three reservoir units by using the concept suggesting that the strike direction of fractures corresponds to the azimuth of the minimum attenuation f0 . We defined f0 as the azimuth of the minimum attenuation Q-1 that we estimated at several azimuths and offsets by using the spectral ratio method. The rose diagrams gathering f0 obtained at several offsets, are in agreement with those gathering the strike direction of open and cemented fractures, obtained from cores interpretation. This is due to the fact that the attenuation Q-1 is caused by a combination of scattering and fluid-related mechanisms. It is physical evidence that fractures, regardless their type, are an important source of scattering mechanism, and also of fluid-related mechanisms if they are open. Another way to define f0 is by using a cosine least square fitting of azimuthal variation of the relative attenuation ?Q-1 , that we estimated at several azimuths and offsets by using a modified spectral ratio method. In this case, the rose diagrams gathering f0 defined at several offsets, are in agreement with those gathering strike direction of open fractures obtained from cores and Full-bore Formation Microimager interpretation. This agreement is due to the fact that the cosine least square fitting is based on the squirt flow mechanism that is caused by fluid movement between grain pores and fractures. Accordingly, comparison between the rose diagrams of f0 estimated by using the two approaches, can be a good way to separate between open and cemented fractures. Such, finding is very interesting for petroleum industry and can help in Enhanced Oil Recovery (EOR) studies.

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U2 - 10.1190/segam2019-3214834.1

DO - 10.1190/segam2019-3214834.1

M3 - Paper

AN - SCOPUS:85079481960

SP - 338

EP - 342

T2 - Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019

Y2 - 15 September 2019 through 20 September 2019

ER -

Study of a fractured reservoir by using the anisotropy of seismic wave attenuation

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