Kirchhoff prestack depth Q-migration and application in Tarim carbonate reservoirs
Bai Ying-zhe1,2, Sun Zan-dong1,2,4,
1. Lab for Integration of Geology and Geophysics, China University of Petroleum(Beijing), Beijing, 102249, China;
2. State Key Lab of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing, 102249, China;
3. Tarim Oilfield Ltd.,CNPC,Korla, Xinjiang, 841000, China
Abstract：The fractured and caved carbonate reservoirs in Tarim Basin are buried bellow depth of 5000m.Because the surface of desert is very loose,the energy of seismic wave surfers serious absorption.Hence the characteristics of seismic signal recorded in these areas always show weak energy,low frequency and phase distortion.It is very important to consider these effects when imaging.To solve the problem above,a Kirchhoff Q-migration method is developed and presented in this paper.Firstly,the theory of Q-migration is introduced.Then a numerical model is tested to prove the applicability of this method.Finally,both Q-migration and traditional Kirchhoff migration are implemented to a VSP field data of Well LG38 in Tarim Basin.The results show that our Kirchhoff Q-migration method is better in imaging than the traditional one.
