Method of seismic exploration for penetrating diffraction barrie

Details Method of seismic exploration for penetrating diffraction barrie Method of seismic exploration for penetrating diffraction barrie

1975-01-22

1976-01-20

Wilbur, Maynard R.

Communications: electrical

Selective

Having electron beam device

340 155CP, 340 7R, G01V 120

Patent

active

039342204

ABSTRACT:
A number of seismic detectors are located in a two-dimensional array on the surface of the earth, either on land or at sea. One or more seismic disturbances are produced in the vicinity of the seismic detectors at points located to produce sampling of various subsurface reflection points to form one or more two-dimensional areas of coverage. For each seismic disturbance, the subsurface reflections thereof received by the various seismic detectors are recorded. In some embodiments, the seismic disturbances are produced at points located to produce multi-directional or multi-azimuth sampling of each of various subsurface reflection points and recordings for different ones of the seismic disturbances are combined to produce stacked recordings wherein multi-directional reflections from common subsurface points are added. By sampling a reflecting point in a multi-directional manner and stacking the recorded samples, diffraction barriers can be effectively penetrated to produce a discernable signal representing the reflecting point notwithstanding the diffraction barrier. Multi-directional or multi-azimuth sampling of reflecting points can be employed to survey beneath surface features such as inhabited areas or seismically opaque features such as salt pockets by utilizing source points and detecting points located away from and on opposite sides of the blocking feature.

REFERENCES:
patent: 3327287 (1967-06-01), Ball et al.
patent: 3506955 (1970-04-01), Backus et al.
patent: 3731270 (1973-05-01), Penhollow
Richards, "Broadside Refraction Shooting," 10/59, pp. 725-748, Grophysics, Vol. 24, No. 4.

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