Fuzzy Seismic Inversion: A Case Study on Channel Features in Johnson Formation of Browse Basin, Australia | ||
| فیزیک زمین و فضا | ||
| Article 8, Volume 49, Issue 4, February 2024, Pages 93-104 PDF (2.04 M) | ||
| Document Type: Research Article | ||
| DOI: 10.22059/jesphys.2024.363747.1007551 | ||
| Authors | ||
| Saber Jahanjooy; Hosein Hashemi* ; Majid Bagheri | ||
| Department of Earth Physics, Institute of Geophysics, University of Tehran, Tehran, Iran. | ||
| Abstract | ||
| Subsurface channels are stratigraphic features in seismic data that can act as reservoirs or conduits for hydrocarbons. However, detecting and characterizing these channels is challenging due to the limitations of seismic resolution and the complexity of the subsurface geology. Seismic inversion is a technique that can enhance the seismic data by transforming the seismic traces into quantitative estimates such as acoustic impedance (AI), which is a key reservoir rock property. AI inversion can help to identify and delineate the subsurface channels by providing more contrast and detail of the channel geometry, fill, and surrounding sediments. Seismic inversion is often challenged by the non-uniqueness, ambiguity and uncertainty of the inversion results due to noise and band-limited data. This paper uses a fuzzy model-based seismic inversion method that integrates prior information and fuzzy clustering constraints to produce more realistic and reliable AI models. This method assigns data points to multiple clusters with varying degrees of membership, which can capture the overlapping of AI values of different geological formations. The method is applied to the 3D Poseidon seismic data from the Browse Basin, offshore Western Australia, and the results are compared with those of conventional model-based inversion. Since there is no well-data in an interest channel zone, a qualitative evaluation with seismic attributes is performed. The subsurface structures are further interpreted by various seismic attributes. The comparison shows that the fuzzy model-based inversion method can improve the resolution, contrast and stability of the AI models and reveal more detail of the subsurface geology. | ||
| Keywords | ||
| Fuzzy seismic inversion; Acoustic impedance; Fuzzy clustering; Seismic attributes; RGB blending | ||
| References | ||
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