Abstract
Three-dimensional (3D) land seismic datasets were acquired from Central Depobelt in the Niger Delta region, Nigeria, with with the aim of attenuating ground roll noise from the dataset. The Omega (Schlumberger) software 2018 version was used along with frequency offset coherent noise suppression (FXCNS) and Anomalous Amplitude Attenuation (AAA) algorithms for ground roll attenuation. From the results obtained, Frequency Offset Coherent Noise Suppression (FXCNS) attenuates ground roll while AAA algorithm attenuates the residual high amplitude noise from the seismic data. Average frequency of the ground roll in the seismic data is 10.50Hz which falls within the actual range of ground roll frequency which is within the range of 3.00 – 18.00Hz. The average velocity of the ground roll in the seismic data is 477.36ms-1 while the velocity of ground roll ranges between 347.44 and 677.37ms-1. The wavelength of ground roll in the seismic data is 50.28m. The amplitude of the ground roll of -6.24dB is maximum at 4.2Hz. Frequency of signal ranges between 10.21 and 25.12Hz with an average of 17.67Hz. Signal amplitude of -8.32dB is maximum at 6.30Hz, while its wavelength is 57.12m. The results of this work can be used in the seismic source-receiver design for application in the area of study. Moreover, with ground roll noise attenuated, a better image of the subsurface geology is obtained hence reducing the risk of obtaining a wild cat drilling.
Highlights
IntroductionBoth signal and undesired noise are recorded at the same time
In seismic data acquisition, both signal and undesired noise are recorded at the same time
Seismic, groundroll, signal, frequency, attenuation, anomalous, amplitude, Niger Delta, Nigeria. Both signal and undesired noise are recorded at the same time. Such undesired ground roll noise contaminates the seismic signal causing poor quality images of the subsurface which can lead to misinterpretation of the subsurface geology (Linville and Meek, 1995)
Summary
Both signal and undesired noise are recorded at the same time. Ground roll has low velocity with low frequency which can overshadow coherent signals (Anstey, 1993; Chukwueke and Ghosh, 2004; Hudson and Knopoff, 1967; Telford et al, 1976; McMechan and Sun, 1991). Due to their dispersive characteristics, ground roll masks shallow reflections at short offsets and at long offsets (Claerbout, 1983; Saatcilar and Canitez, 1988; Henly, 2003; Mooney and Kaasa, 2005; Sengbush, 1983; Futherman, 2001; Chidi, 1988; Fitch, 1976; Short and Stauble, 1967; Uko et al, 1992). This paper aims at removing ground roll noise from land seismic data
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