Method for determining the degree of change of material...

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

G - Physics

01

V

349/15

G01V 1/28 (2006.01) E21B 43/243 (2006.01) E21B 49/00 (2006.01) G01V 1/42 (2006.01)

Patent

CA 1111542

METHOD FOR DETERMINING THE DEGREE OF CHANGE OF MATERIAL PROPERTIES OF UNDERGROUND STRATA (D#71,200-DTA-138-F) ABSTRACT OF THE DISCLOSURE 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 ex- pected 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 magniture of the difference signals obtained and their propagation time are determined. I

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