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Study of constraint methodology in constrained impedance inver sion.

Ma Jinfeng et al. Ma Jinfeng,Department of Geology, Northwest University, Xi'an 710069  
Impedance inversion technique based on convolutional model can not reas onably constrain high-frequency information of inversion result due to the infl u ence of seismic wavelet band limitation property. To invert for accurate high-f r equency information of impedance, reasonable constraint conditions are needed. T he conventional constraint condition constructed by using well log data and hori zon interpretation results is reliable in the vicinity of borehole, but its erro r may be large at a certain distance away from borehole. Therefore this cause in accurate constrained inversion results. Starting from the model trial computatio n of constrained inversion, this paper presents a new method which takes the max imal and minimal velocity, velocity envolop, mid-value filtering, and velocity c ontrast of acoustic log data as constraint condition. The method can effectively reduce the influence of noise on inversion result, decrease the nonuniqueness o f solution, and increase the creditability of seismic data inversion result in a reas away from borehole.
【Fund】: 86 3计划重大项目!“海上多波地震勘探技术”82 0 - 0 5 - 0 2 - 0 3- 10号资助
【CateGory Index】: P631
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