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Volume 41, Issue 5
  • ISSN: 0263-5046
  • E-ISSN: 1365-2397

Abstract

Abstract

A key step toward reducing the risks and uncertainties associated with hydrocarbon exploration in carbonate rocks is to assess the prospects of using multiple methods. Accordingly, I introduced and developed a novel template for fluid type discrimination and detection in the extended elastic impedance (EEI) domain based on well data and seismic data. To this end, fluid substitution modelling was performed by formulating different fluid type scenarios (brine, oil, and gas) to utilise a rock physics model with unlimited pore types. These scenarios were subsequently converted to EEI trends and expressed as functions of intercept-gradient coordinate rotation angle (χ angle) to form EEI templates. The obtained templates were successfully verified against well-log data at a blind well and also by ultrasonic measurements on core samples using a triaxial cell. Next, fluid type detection was performed on prestack migrated seismic data that was originally acquired over a real carbonate reservoir with complex pore types. For this purpose, a low-frequency model was built and wavelet extraction was performed at corresponding χ to obtain an EEI cube through inversion. The obtained results were interpreted considering the proposed template, leading to the delineation of the hydrocarbon-bearing zone. The results were further verified based on water saturation log at a blind well drilled on the basis of interpretation of seismic data, simultaneous inversion and the available geological information. A big advantage of the EEI template over conventional EEI analysis and simultaneous inversion is that it considers more than one window, which can provide for improved accuracy and reliability in fluid detection in carbonate rocks.

EAGE Publications BV
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2023-05-01
2024-04-20

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New template for fluid detection driven by Extended Elastic Impedance
First Break 41, 41 (2023); https://doi.org/10.3997/1365-2397.fb2023033
/content/journals/10.3997/1365-2397.fb2023033
/content/journals/10.3997/1365-2397.fb2023033
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  • Article Type: Research Article
Keyword(s): EEI inversion; EEI template; Extended elastic impedance (EEI); Seismic fluid detection

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