Estimation of near surface Q value based on the datasets of the uphole survey in double hole
Yu Cheng-ye1, Zhou Zhi-cai2
1. Institute of Exploration&Development,Daqing Oilfield Company Ltd.,Daqing City,Helongjiang Province,163712,China;
2. 1st Geophysical Exploration Company of Drilling Engineering Corporation,Daqing Oilfield Company Ltd.,Daqing City,Helongjiang Province,163357,China
Abstract：Quality factor Q itself reflects the rock physical properties of near surface layer,however the estimation of Q value for the near surface layer has been always a difficult point in the research.The near surface Q value can be inverted either by near surface model inversion or by ground wave attenuation Q model,but its accuracy is not enough and can not meet the need of high accuracy seismic exploration.A near surface Q value method based on the datasets of the uphole survey in double hole was proposed in this paper,by building and solving the equation group which describes the peak value changing for the surface geophones and downhole geophones,the analytic solution for the near surface Q value was acquired.The testing results for the method based on field datasets from Daqing Oilfield show that the algorithm is stable,acuired Q value is reasonable,the reverse Q filtering using the acquired Q value could effectively eliminate near surface affects in time,frequency and space domain,especially the affect from the seismic signal phase,so the seismic resolution was raised.
于承业, 周志才. 利用双井微测井资料估算近地表Q值[J]. 石油地球物理勘探, 2011, 46(1): 89-92.
Yu Cheng-ye, Zhou Zhi-cai. Estimation of near surface Q value based on the datasets of the uphole survey in double hole. OGP, 2011, 46(1): 89-92.
