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- W2973741226 abstract "Shallow gas zones are a major concern in offshore drilling because of their potential to quickly cause kicks or blowouts. Shallow gas hazards are identified by using a series of seismic attributes. We have combined seismic data analysis and well-log analysis to identify the location and distribution of shallow gas layers. These shallow gas zones are formed during a large influx of gas due to a blowout well. The blowout well is located in the Nam Con Son Basin, offshore Vietnam. The seismic data acquired before and after the blowout record the changes in the shallow gas location. We compare seismic data without gas effects to data affected by gas after the blowout. The changes of reflectors between 2D seismic data (preblowout well) and 3D seismic data (postblowout well) are analyzed by using seismic attributes. The shallow gas is recognized in seismic data based on several criteria such as the push-down effect that demonstrated the delay in traveltime throughout the slower zone, high amplitude with negative phase reflection at the top of shallow gas layers, and acoustic blanking from wave scattering and amplitude attenuation. Geobodies mapped are associated with shallow gas zones by merging seismic attributes to identify zones that are a combination of strong amplitudes and low frequencies. The attributes that identify known shallow gas anomalies are also applied to the entire seismic volume for identification of shallow gas hazards." @default.
- W2973741226 created "2019-09-26" @default.
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- W2973741226 date "2020-02-01" @default.
- W2973741226 modified "2023-09-27" @default.
- W2973741226 title "Identifying shallow gas zones by using seismic attributes, offshore Vietnam" @default.
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- W2973741226 doi "https://doi.org/10.1190/int-2018-0139.1" @default.
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