Estimation of stratigraphic absorption parameter based on center frequency method
Wei Wen1,3, Li Hong-mei1, Mu Yu-qing2, Wang Shu-gang1, Wang Hong1
1. Geophysical Research Institute,Shengli Oilfield Company,Sinopec,Dongying, Shandong 257022, China;
2. Western New Zone Prospect Research Center,Shengli Oilfield Company,Sinopec,Dongying, Shandong 257022, China
Abstract:Aiming for gas-bearing formation identification,this paper presents a method for estimating stratigraphyic absorption parameter(Q value) by seismic signal central frequency.Firstly an energy distribution function can be obtained by a time-frequency transform on seismic signals with the S-transform.Then based on this function,the central frequency and the relation between the central frequency and the stratum Q value are calculated,and the equivalent strata Q value is obtained.And then the single formation Q value is work out.In the forward model,the central frequency of the gas-bearing formation becomes smaller than non-gas-bearing formations,and strong absorption are presented in the Q value profile.The phenomena make sure of the feasibility of the method in strata Q value estimation.The Q-value estimation by this method in Yong'an,Dongying Sag reveals the actuality of the absorption characteristics.
魏文, 李红梅, 穆玉庆, 王树刚, 王红. 中心频率法估算地层吸收参数[J]. 石油地球物理勘探, 2012, 47(5): 735-739.
Wei Wen, Li Hong-mei, Mu Yu-qing, Wang Shu-gang, Wang Hong. Estimation of stratigraphic absorption parameter based on center frequency method. OGP, 2012, 47(5): 735-739.