초록 ▼

The present invention indicates that in exploration of permafrost regions of the world for oil and gas accumulations, flexure noise can be attenuated by careful placement of the vibratory source vis-a-vis the receiver array during collection of the Vibroseis�

The present invention indicates that in exploration of permafrost regions of the world for oil and gas accumulations, flexure noise can be attenuated by careful placement of the vibratory source vis-a-vis the receiver array during collection of the Vibroseis�

대표청구항 ▼

Method of improving resolution of seismic data collected in a transition zone of a permafrost region between a frozen land mass and an adjacent sea-ice region, said data being collected by common midpoint (CMP) collection methods including sequentially activating at least one conventional vibratory

Method of improving resolution of seismic data collected in a transition zone of a permafrost region between a frozen land mass and an adjacent sea-ice region, said data being collected by common midpoint (CMP) collection methods including sequentially activating at least one conventional vibratory source at a series of sourcepoint locations across the surface of said permafrost region in which amplitude and phase spectra of the generated energy are controlled so that said generated energy changes smoothly as a function of time, and redundantly collection reflections thereof via a series of receivers at a plurality of receiver stations to provide 2-dimensional multifold coverage of the subsurface along a survey line, comprising the steps of: (a) adopting a survey strategy wherein said sourcepoint locations established for said at least one vibratory source, are always separated from said receiver stations by one or more ice fracture areas formed on or about the surface of the transition zone along said survey line; (b) generating seismic field records by positioning and employing said at least one vibratory source and said series of receivers in accordance with the collection strategy of step (a) such that individual sourcepoint-receiver station locations can be redundantly associated with a selected number of traces to form a series of CMP gathers associated with said survey line but wherein generated flexure vibrations associated with activation of said at least one vibratory source has been surprisingly attenuated by passage through said one or more ice fracture area whereby resolution of seismic reflection events associated with and depicted in said each trace, is much improved.