Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1997-05-14
2000-09-26
Oda, Christine
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 28, 181104, 181106, G01V 140, G01V 100
Patent
active
061250791
ABSTRACT:
A transducer configuration for use in acoustically imaging a target region behind an acoustically reflective layer includes a sonde having a geometrical center and constructed and arranged to support a plurality of transducers. The system includes a first transducer disposed within the sonde at a first distance from the geometrical center for generating a first acoustic pulse and for receiving a first acoustic signal. The acoustic signal comprises a first reflection from the reflective surface, a first set of fluid multiples arising from reflections between the reflective layer and a surface of the first transducer, and a first signal associated with the target area. The system also includes a second transducer disposed within the sonde at a second distance from the geometrical center for generating a second acoustic pulse and for receiving a second acoustic signal. The second acoustic comprises a second reflection from the reflective surface, a second set of fluid multiples arising from reflections between the reflective layer and a surface of the second transducer and a second signal associated with the target area. A mechanism for receiving and processing signals received by the first and second transducers at time intervals which occur between receipt of the first and second sets of fluid multiples, respectively, wherein signal values at time intervals between receipt of fluid multiples provide acoustic waveforms associated with the target region. Each target region, therefore, has a time interval on at least one of the two waveforms which is free of fluid multiples.
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Birchak James R.
Mandal Batakrishna
Masino James E.
Minear John W.
Ritter Thomas E.
Gas Research Institute
Jolly Anthony
Oda Christine
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