HIGH RESOLUTION, MARINE SEISMIC STRATIGRAPHIC SYSTEM

摘要

High resolution, high penetration marine seismic stratigraphic system wherein a slanted cable (16) comprising spaced-apart hydrophone arrays (18a, 18b, ... 18x) gather seismic reflections so that the corresponding primary (20) and ghost (24) reflections from a common interface gradually are spaced apart. The primary reflections are time aligned and stacked. The ghost reflections are phase reversed, time shifted and time aligned to coincide with the time aligned primary stack and then stacked to give a combined primary and ghost stack, which effectively includes almost twice the information as from the primary stack alone. No inverse notch filters are needed to correct for the ghost phenomenon. Focused noise out of the vertical plane is also virtually eliminated.