Changes

==From Acquisition to Seismic Trace==

==From Acquisition to Seismic Trace==

Seismic data acquisition is done by geophysicists where source is shot into subsurface. Then, the wave propagate and is reflected on rock boundary. After that, the wave that is reflected propagates with different path to surface and is recorded by geophone. The wave that is recorded is P wave. This wave consist of direct wave, reflected wave, refracted wave and noise. Amplitude that wants to be interpreted in oil and gas industry commonly is only reflected waves. Therefore, Geophysicists processing the data to reduce amplitude effect from another waves. The seismic data after processing can be classified to be post-stack and pre-stack data. Post-stack data analyze seismic data with zero offset amplitude, while pre-stack data analyze seismic data with non-zero offset amplitude.  

Seismic data acquisition is done by geophysicists where source is shot into subsurface. Then, the wave propagate and is reflected on rock boundary. After that, the wave that is reflected propagates with different path to surface and is recorded by geophone. The wave that is recorded is P wave. This wave consist of direct wave, reflected wave, refracted wave and noise. Amplitude that wants to be interpreted in oil and gas industry commonly is only reflected waves. Therefore, Geophysicists processing the data to reduce amplitude effect from another waves. The seismic data after processing can be classified to be post-stack and pre-stack data. Post-stack data analyze seismic data with zero [[offset]] amplitude, while pre-stack data analyze seismic data with non-zero offset amplitude.  

[[File:Aapg 2.png|350px|thumbnail|right|Figure 2 Acquisition Seismic Data.<ref>Boyer, S. and Mari, J.L (1997). Seismic Surveying and Well Logging. Paris: Technip</ref>]]

[[File:Aapg 2.png|350px|thumbnail|right|Figure 2 Acquisition Seismic Data.<ref>Boyer, S. and Mari, J.L (1997). Seismic Surveying and Well Logging. Paris: Technip</ref>]]