3D Vector Imaging of Converted Waves for Fractured Reservoirs
C.L. Wang, J.B. Cheng and W. Weibull
Event name: 79th EAGE Conference and Exhibition 2017
Session: RTM and Multi-component Imaging Theory
Publication date: 12 June 2017
Info: Extended abstract, PDF ( 985.68Kb )
Price: € 20
The fractured system widely exists in the earth media. It causes anisotropy on the seismic wave scale. Passing through such media, a shear wave splits into two mutually orthogonal waves with different propagation velocities. Unlike the well-behaved qP mode, the qS1- and qS2-wave do not consistently polarize as a function of the propagation direction. Therefore, continuous polarization directions of qSV and qSH mode are used for accurate wave mode decoupling. Combined with vector imaging condition, the proposed method properly utilizes two converted shear waves in elastic reverse time migration (ERTM), without polarity reversal. Sensitivity analysis of wave mode decoupling demonstrates the potential of converted wave imaging in analyzing fracture attribute. Synthetic examples demonstrate the validity of this approach.