Publicações – GIR – Grupo de Inferência de Reservatório

Uma implementação do método da refletividade para modelagem eficiente de dados sísmicos marítimos e de OBC

Uma implementação do método da refletividade para modelagem eficiente de dados sísmicos marítimos e de OBC Revista: Revista Brasileira de Geofísica, 2009, 27, 323-332. Abstract: In this paper, a special implementation of the reflectivity method is proposed to simulate marine seismic acquisitions. The method was designed for efficient calculation of pressure field, in the case of source and receptors (hydrophones) located in the water column and the vertical or horizontal displacement (or velocity) in the case of simulation of multicomponent OBC (Ocean Bottom Cable) or OBS (Ocean Bottom Sensor) acquisition. One of the main advantages of the method is [...]

Uma implementação do método da refletividade para modelagem eficiente de dados sísmicos marítimos e de OBCana2018-12-26T14:06:12-02:00

L1 norm inversion method for deconvolution in attenuating media

L1 norm inversion method for deconvolution in attenuating media Revista: Geophysical Prospecting, 2013, 61, 771–777Abstract: In order to perform a good pulse compression, the conventional spike deconvolution method requires that the wavelet is stationary. However, this requirement is never reached since the seismic wave always suffers high-frequency attenuation and dispersion as it propagates in real materials. Due to this issue, the data need to pass through some kind of inverse-Q filter. Most methods attempt to correct the attenuation effect by applying greater gains for high-frequency components of the signal. The problem with this procedure is that it generally boosts high-frequency noise. In [...]

L1 norm inversion method for deconvolution in attenuating mediaana2018-12-20T20:41:56-02:00

High-resolution gathers by inverse Q filtering in the wavelet domain

High-resolution gathers by inverse Q filtering in the wavelet domain Geophysics, 2013, 78, V53-V61. Abstract: We have developed and applied an inverse Q filter formulation using the continuous wavelet transform (CWT), which provides a natural domain for time-variant operations, such as compensation for propagation in attenuating and dispersive media. The well-known linear attenuation model, given as a function of time and frequency, was applied very efficiently over wavelet coefficients in the time-frequency domain to correct for amplitude and phase distortions, as necessary. The inverse CWT yields the recovered trace with a broader bandwidth. The process works on a trace-by-trace [...]

High-resolution gathers by inverse Q filtering in the wavelet domainana2018-12-20T02:15:25-02:00

Mapping fluid distribution in a pinch-out reservoir model: A physical modeling study

Mapping fluid distribution in a pinch-out reservoir model: A physical modeling study Journal of Applied Geophysics Abstract: This work shows the results obtained from seismic physical modeling experiments that image the non-homogeneous, two-phase distribution of immiscible fluids inside a cavity in a pinch-out model. The main goal of this study was to verify how the seismic sections can be used to observe the fluid distribution in this type of reservoir. A high-resolution deconvolution method was applied to improve the images resolution and depth migration correctly positioned the events. Instantaneous attributes were used to assist data interpretation. The results [...]

Mapping fluid distribution in a pinch-out reservoir model: A physical modeling studyana2018-12-20T02:07:42-02:00

The value of information from time-lapse seismic data

The value of information from time-lapse seismic data Revista: The Leading Edge, 2011, 30. 572-576. The method presented here is an objective way to determine the value of information, as it establishes a relationship between the value of perfect information and the technical evaluation score. This makes it possible to compare the value of competing projects evaluated by different analysts. Additionally, the value of information of a 4D seismic survey can be calculated by its agreement with different management strategies. We tested three possible selections: optimistic, realistic, and conservative evaluations of VOI. In all cases where 4D seismic [...]

The value of information from time-lapse seismic dataana2018-12-26T14:45:24-02:00