Well logging and well-side seismic data matching based on step-by-step iterative method
Song Jianguo1, Cheng Liang1, Meng Xianjun2, Wei Guohua2
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
2. Geophysical Institute, Shengli Oilfield Branch Co., SINOPEC, Dongying, Shandong 257022, China
Abstract：It is difficult to match well logging data with well-side seismic data in seismic frequency band. We propose here a step-by-step iterative method for this purpose. The method consists of the following steps. ①We calculate an initial reflection coeffecient from well logging data, then extract an initial seismic wavelet from a well-side seismic trace with auto-correlation; ②With constraint of the initial wavelet, we extract new seismic wavelet from the well side seismic trace; ③With constraint of the initial reflection coeffecient, we extract new reflection coeffecient from the well side seismic trace; ④If the convolution of the new seismic wavelet and the reflection coeffecient do not match with the well-side seismic trace, we replace the intial seismic wavelet with new seismic wavelet, and the initial reflection coeffecient with new reflection coeffecient, and then back to the step ②. This step-by-step iterative process is repeated until the synthetic seismogram convolved by reflection coeffecient and seismic wavelet consistent with the well-side seismic trace. This method downgrades logging data frequency so logging data in the mid and low-frequency range can be matched with surface seismic data. Then Ricker wavelet convolves with matched reflection coeffecient to construct pseudo cross-well data. The pseudo cross-well data can improve 3D seismic data resolution with joint frequency expanding method.
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