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《Chinese Journal of Geophysics》 2010-12
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An application of high resolution P and S wave crosshole tomography in understanding the reservoir features

QU Chen, YANG Wen-Cai,YU Chang-QingGeological Institute , Chinese Academy of Geosciences , Beijing 100037, China  
The P and S wave fields were obtained by crosswell apparent velocity-polarization separation method. Precise first-arriving times of P ahd S waves and the cross-hole seismic tomography cascade algorithm were used to obtain accurate and high resolution P wave and S wave velocity structures and Poisson s ratio. Joint interpretation of borehole logs, Poisson s ratio and velocity images of P- and S-wave was carried out to clarify the lithologic and reservoir characters between the two investigated boreholes. The experimental results with simulated and real seismic data show that this method can achieve a resolution for the thin horizontal layers up to 1/4 of the dominant wave length which is higher than that of acoustic waveform tomography, and can accurately distinguish slanting and vertical faults. We apply this method to obtain P wave and S wave velocity structures and Poisson s ratio in Ken 71 block. The research result reveals that the Poisson s ratio distribution matches well with borehole logs, and the distribution of the low/ high Poisson s ratio layers in the image is consistent with the location of sand/mud layers predicted from the borehole logs. According to seismic test data of rock physics, we can distinguish the shale, sandstone, water-bearing sandstone, oil-bearing sandstone, and can achieve fine descriptions of geologic formations, structures and reservoirs.
【Fund】: 中国地质科学院地质研究所基本科研业务费项目(J0815);; 中石化科技部项目开发项目(P07040)的资助
【CateGory Index】: P631.4
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