Seismic processing and imaging with a drill-bit source

Details Seismic processing and imaging with a drill-bit source Seismic processing and imaging with a drill-bit source

1989-03-13

1990-10-16

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 40, 364421, 364422, 364148, G01J 100

Patent

active

049640879

ABSTRACT:
An apparatus (10) for determining while drilling in the earth with a drill bit (12) the positions of seismic wave reflecting geologic formations (15, 17) has seismic wave sensors (A, B) positioned in the earth near its surface (42). The sensors (A, B) are disposed at known positions with respect to the borehole. The drill bit (12) generates the seismic waves. The sensors (A, B) receive the seismic waves both directly and by reflection from the geologic formations (15, 17). Adaptive filters (20, 26) are connected to each of the sensors (A, B). A summing circuit (34) receives outputs from the adaptive filters (20, 26). The converged impulse responses of the adaptive filters provide information about the amplitude of the reflected waves and their arrival times at the surface, thus allowing detection of the reflecting horizons and their location and physical characteristics.

REFERENCES:
patent: 4243935 (1981-01-01), McCool et al.
patent: 4355368 (1982-10-01), Ziedler et al.
patent: 4849945 (1989-07-01), Widrow
patent: 4866680 (1989-09-01), Scherbatskoy
K. Waters, "Reflection Seismology"; 1981 Book Publ., John Wiley & Sons, Inc., Tn 269W37, pp. 124-128.
Widrow et al., "Adaptive Signal Processing"; Prentice Hall, 1985 Book, FK5102.5w537, pp, 128-131.

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