Research Of Static Correction Of Converted Waves CRP Stacked Section Structural Correction

One of the shortcomings of traditional seismic exploration is the shortage of earthquake information. In order to describe the properties of the Earth's interior media more accurately, which naturally need the better use of information, not only need to use P-wave information, but also need to use SV, SH-wave information. Converted-wave technology is a new technology of a current seismic exploration which is based on the conventional P wave exploration and can not be compared. The static correction is the difficulties and priorities in the converted wave exploration. The converted-wave static correction will help solve the problem of improving the effectiveness of multi-wave exploration, solving this problem has an important theoretical and practical significance.Static correction of the converted wave is obviously the component of P-wave static correction and the receive point of S-wave static correction, for the former, the same with the conventional P-wave static correction. And the S-wave, without affecting pore fluid, and its near-surface often extend to the water surface. And the topography, thickness, in particular the low-speed zone, the impact of changes in severe cracks. The near-surface shear wave velocity is low, tremendous changes, so the near-surface shear velocity change on the S-wave reflection than the spread of the near-surface of the P-wave velocity changes reflected the impact of vertical wave propagation, S-wave static correction in the same position usually greater than P wavestatic, which about 2 to 10 times to P wave static, with the ratio of V_p/V_s in shallowarea. As a result of these unusually large ratio, S-wave static correction can not be estimated reliably. Therefore, the conventional P-wave static correction methods can not applicable to P-SV wave static correction. This paper conducted a study on this, from the converted wave receiver characteristics of static correction, the first wave of change in CRP superimposed on the track, pick up the same section of the shaft, and then with longitudinal wave corresponding layer of the underground structure to strike a receiver the S-wave static correction. The method adopted by the theoretical model and the actual data verify its effectiveness. For this reason many scholars and experts put forward to their own solutions, but due to the complexity of the static correction converted wave, the issue still has not been resolved satisfactorily.In this paper the research makes use of the track pick-up events from the converted waves CRP stacked traces, and combines the underground structures in the corresponding horizon of the P wave to seek the statics in P-SV receiver.The basic concepts of the static correction of converted waves are introduced and some current methods of static correction of converted waves are commentated in the paper. And then the total receiver statics are obtained from tracing pick-up the event in P-wave stacked profile, using the referenced theories and methods of CRP stacked tracks raised by Cary, when the transverse strata structure has big changes, the structural correction of the statics should be done by the S-wave processing result.From the theoretical mode and real data experiment, it is indicated that the method in this paper can resolve the short wavelength receiver statics of converted wave.