APPLICATION OF ABSORPTION ANALYSIS TECHNIQUE FOR INSTANTANEOUS WAVELET IN COMPLEX AREA:A CASE IN SHANLE AREA IN TUHA BASIN
Received date: 2006-03-09
Revised date: 2007-02-06
Online published: 2008-06-20
The high frequency of seismic waves will attenuate quickly when the porous reservoir is permeated by gas (P wave attenuates at great speed in the gas medium). Accordingly, the attenuation regularities of the high frequency of traveling seismic can be used for gas reservoirs detection. To get exact seismic information,seismic data should be processed to get high resolution, high S/N and high fidelity. Based on the processed seismic data, we apply the wavelet based energy absorbing analysis to calculate time varying space varying wavelets, and then calculate the vertical distribution of the energy attenuation of instantaneous wavelets, according to which the noise will be eliminated. Finally, the absorption abnormity of the gas reservoir can be analyzed with accuracy using the post stack data. The dominating oil and gas strata in the Shanle area is joined to special strata vertically, the E shreservoir is glutenite and there are several coal layers under J2x2. Both strata appear as strong absorption in the absorption section ofinstantaneous wavelets. The strong absorption caused by theoil and gas bearing strata is mixed with that by special strata, but the oil andgas strata can berecognized by their differences. The strong absorption of the gas bearing part ofEshshifts upwards in time direction, resulting in its higher position than the event of the glutinite strata. The strong absorption of J2x2 is weaker than that of coal layer, showing the existence of oil and gas.
WANG Hong-yu; LI Quan-guo . APPLICATION OF ABSORPTION ANALYSIS TECHNIQUE FOR INSTANTANEOUS WAVELET IN COMPLEX AREA:A CASE IN SHANLE AREA IN TUHA BASIN[J]. Natural Gas Geoscience, 2007 , 18(2) : 289 -292 . DOI: 10.11764/j.issn.1672-1926.2007.02.289
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