Geosciences Journal

  • 제22권6호
  • /
  • Pages.1027-1039
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  • 2018
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  • 1226-4806(pISSN)
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  • 1598-7477(eISSN)
한국지질과학협의회 (The Association of Korean Geoscience Societies)
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Seismic attributes for characterization of a heavy-oil shaly-sand reservoir in the Muglad Basin of South Sudan

  • Deng, William A. (Petroleum Resources Technology, University of Science and Technology) ;
  • Kim, Taeyoun (Petroleum Resources Technology, University of Science and Technology) ;
  • Jang, Seonghyung (Petroleum Resources Technology, University of Science and Technology)
  • 투고 : 2017.11.13
  • 심사 : 2018.01.18
  • 발행 : 2018.12.01
⟨ 이전 논문 다음 논문 ⟩

초록

Seismic attributes are often used to identify lithology and evaluate reservoir properties. However, interpretation based only on structural attributes and without knowledge of the Vp/Vs ratio can limit the ability to evaluate changes in heavy oil reservoirs. These limitations are often due to less obvious impedance differences. In order to investigate pieces of evidence of a heavy-oil shaly-sand reservoir from seismic data, besides geochemistry, we studied seismic attributes and characterized the reservoir using seismic stack data and well logging data. The study area was the Muglad rift basin in South Sudan. We conducted a seismic complex analysis to evaluate the target reservoir. To delineate the frequency responses of the different lithological units, we applied the spectral decomposition method to the target reservoir. The most unexpected result was continuous bands of strong seismic reflectors in the target reservoir, which extended across the borehole. Spectral decomposition analysis showed that the low-frequency zone of 25 Hz dominant frequency was consistent with instantaneous attributes. This approach can identify lithology, reveal frequency anomalies, and filter the stacked section into low- and high-frequency bands. The heavy-oil reservoir zones exhibited velocity attenuation and the amplitude was strongly frequency dependent.

키워드

과제정보

연구 과제 주관 기관 : Korea Institute of Energy Technology Evaluation and Planning (KETEP), Korea Institute of Geoscience and Mineral Resources (KIGAM)

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피인용 문헌

  1. The Integrated Approach to Seismic Attributes of Lithological Characterization of Reservoirs: Case of the F3 Block, North Sea-Dutch Sector vol.9, pp.3, 2018, https://doi.org/10.4236/ojer.2020.93016