ROCKS SEISMIC PROSPECTING METHOD Russian patent published in 2005 - IPC

FIELD: seismic prospecting.

SUBSTANCE: method can be used for searching non-uniformities. While conducting seismic prospecting the radiated wave receivers and transmitters are located outside inspected rock mass at two adjacent faces of tested volume of rock at the squares having radius equal or 5 times longer than wavelength in tested volume of rocks. Tested mass is a divided to cubic unit having heights of faces no longer than Ѕ wavelength of radiated wave specified by depth of testing. Rock mass is subject to radiographic test at two orthogonal directions. Radiated waves are focused into center of any cubic unit and waves at receivers are subject to co-phase summation from center of any cubic unit for any radiation of seismic waves. Energy of waves from any center is measured. Volumetric image of local diffracting object in rock mass is achieved from maximal values of energy from any center. When getting local volumetric image of object the calculations are repeated for speed values increasing subsequently depending on speed achieved during seismic well logging. Speed values at which centers of image of object coincide are assumed to be truthful and position of object received at that speed is assumed to be truthful as well. Image of object is put to coincidence from two directions for separate cross-sections. That image is assumed as truthful. Units are put together from which units the energy has maximal value at two images.

EFFECT: improved precision of determination and shape of diffracting object.

6 dwg