Methods and apparatus for seismic exploration using pressure changes caused by sea-surface variations

摘要

Disclosed are apparatus and methods for seismic exploration using pressure changes caused by sea-surface variations as a low-frequency seismic energy source. One embodiment relates to a method which obtains dual wave-fields measured below a sea surface. The measured dual wave-fields are decomposed into a down-going wave-field and an up-going wave-field at a selected observation level. Seismic images are then generated using the down-going and up-going wave-fields. Other embodiments, aspects, and features are also disclosed.

主权项

1. A method for seismic exploration, the method comprising:
using pressure changes caused by variations of a sea surface as a low-frequency seismic energy source with no active seismic energy source; obtaining dual wave-fields measured below the sea surface; selecting an observation level; decomposing, by computer, the dual wave-fields into a down-going wave-field and an up-going wave-field at the observation level; and generating, by computer, seismic images using the down-going and up-going wave-fields.