Method for determining the degree of change of material properti

Details Method for determining the degree of change of material properti Method for determining the degree of change of material properti

1979-12-31

1985-06-18

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 30, 181102, G01V 100, G01V 114, G01V 122

Patent

active

045244359

ABSTRACT:
A method of monitoring underground processes in which changes of material properties of underground strata occur in a limited area, especially in regard to in-situ combustions, gasifications in coal and petroleum deposits, in order to localize and determine the degree of change of material properties of underground strata, includes emitting exactly reproducible time-sequential seismic signals in each geological strata where changes are expected to take place. The signals are recorded in the appropriate geological stratum at one or more positions, or in the same position. The signals are stacked with signals of reverse sign. The magnitude of the difference signals obtained and their propagation time are determined.

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Dennis et al., "Developments of . . . Hot Rock", 5/1976, pp. 97-107, Proceedings of the 22nd International Instrumentation Symp., San Diego, Calif.

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