SPECTRAL ANALYSIS FOR SEISMIC INTERPRETATION Russian patent published in 2002 - IPC

FIELD: processing of seismic data. SUBSTANCE: given approach makes it feasible to improve quantitative evaluation and visualization of minor effects of tuning of thin seismic stratum and other side disturbances of continuity of rock. Reflection from thin stratum is characteristically expressed in frequency region and can generate information on thickness of stratum. This reflection has periodic sequence of marks in its amplitude spectrum. These marks are spread by distance which is inversely proportional to temporary thickness of thin stratum. Apart from it this characteristic expression can be employed to follow reflections of thin stratum within limits of 3-D volume and to evaluate thicknesses of strata and their side extent. Salient feature of invention lies in generation of set of seismic paths distributed over specified volume of ground and in selection of specified volume. At least one section of seismic paths is converted with the aid of orthonormal conversion which gives collection of conversion factors. Obtained factors are organized in tuning cube that can be employed jointly with computer for identification of localization of hydrocarbons. It can also result in plotting of map for prospecting for oil and gas. EFFECT: improved quantitative evaluation and visualization of minor effects of tuning of seismic thin stratum. 31 cl, 16 dwg