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《Geophysical Prospecting for Petroleum》 2012-01
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The application of an S transform based absorption and attenuation technique for prediction of gas-bearing reservoir

Wang Xiaojie,Yin Xingyao,Wu Guochen.School of Geosiciences,China University of Petroleum(East China),Qingdao 266555,China  
The formation quality value Q reflects the absorption and attenuation characteristics of medium,which is an important parameter for gas detection.When the geologic conditions are complex,for example,existing high-impedance geologic bodies such as igneous rock,it is difficult to distinguish the strong amplitude caused by gas or high-impedance geologic bodies.In order to solve the problem,firstly,pre-processing is carried out on seismic data by using the similar background separation technique to remove the information irrelevant to stratigraphic characteristics.Then,time-frequency spectrum in S domain is obtained by applying the S transform on pre-stack seismic data,combined with spectral ratio method in S domain,the slope of spectral ratio.Finally,by linear regression we can obtain the Q value of zero-offset seismic data.This method makes full use of the advantages of the pre-stack seismic data containing more information than the post-stack seismic data and high time-frequency resolution of the S transform.Moreover,the method was applied to extract the Q value of actual seismic data.The results show that Q values in the gas-bearing zone are relatively low and anomalies are obvious;on the contrary,in the non-gas-bearing zone such as high-impedance geologic bodies,Q values are relatively high,and there is no anomaly.Thus,the technique can better reflect the absorption characteristics of formation and improves the prediction accuracy of gas-bearing reservoir.
【Fund】: 国家重点基础研究发展计划(973)项目(2007CB209605)资助
【CateGory Index】: P631.44;P618.13
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