Experimental analysis on seismic impedance inversion
Li Guo-fa1,2, Wang Yan-cang3, Xiong Jin-liang4, Ma Yan-yan1,2, Li Hao1,2
1. State Key Lab of Oil Resource and Prospecting,China University of Petroleum,Beijing City,102249,China;
2. CNPC Key Lab of Geophysics,China University of Petroleum,Beijing City,102249,China;
3. Huabei Oilfield Branch Company of Petrochina,Renqiu City,Hebei Province,062552China;
4. Dagang Oilfield Branch Company of Petrochina,Tianjin City,300280,China
Abstract：Based on field well logging data and seismic horizons a 2d impedance experimental model was established in this paper,convolution algorithm was used to generate synthetic seismic record,then for the record the well logging constraint impedance inversion and the sparse impulse impedance inversion were conducted respectively,by taking the maximum effective frequency of the seismic data as cut-off frequency,the inversion results were divided into high frequency component and low frequency component,after analyzing their reliability and influencing factors,a joint inversion of well logging constraint impedance inversion and the sparse impulse impedance inversion was conducted,the experimental results show the following conclusions:(1):by using well logging constraint inversion method the low frequency component of the impedance can be accurately inverted,while the high frequency component of the inversion result was mainly from the initial impedance model,(2):The sparse impulse inversion method could generate the frequency component which is not within the effective frequency bandwidth of seismic data,but it could assure the reliability of the low frequency component of the inversion results.(3):The well logging constraint impedance inversion and the sparse impulse impedance inversion have strong complementarity,jointly applying of the two inversion methods could improve the reliability of the inversion results.
