|
| | Abstract | | High quality marine seismic acquisition technique has been widely available since early this century. Various innovative technologies emerged recently. Circular shooting technique was first proposed during 1980's, but it had not been technically possible until the streamer steering becomes available with high quality marine seismic. This steering streamer capability also enabled another technique to acquire 3D seismic data covering low frequency range from zero to approximately 6-12 Hz. This is an enhanced technique of Over/Under acquisition, and called as DISCover. This paper will describe an acquisition, processing and inversion method that can fill the frequency "gap" in the data spectrum without the need for well data. By use of muti-level sources and streamers the gap can be minimized in this crucial low frequency zone. Data from a 3D case study was acquired using DISCover over the NW Shelf offshore Australia. The streamer spread consisted of six shallow streamers towed at a depth of 6 m and two deeper streamers towed at a depth of 20 m. Results showed considerable low frequency improvement of around 12dB in signal-to-noise ratio below 10Hz. The consequent improvement to the inversion will also be shown. |
|
|
|
| |
|