YIN Zhi-heng1,2, WEI Jian-xin1,2, DI Bang-rang1,2, LI Xiang-yang1,2, SUN Wen-bo1, QI Yu1
1 State Key Laboratory for Petroleum Resource and Prospecting,Chinaa University of Petroleum(Beijing),Beijing 102249,China;
2 CNPC Key Laboratory of Geophysical Exploration,Chinaa University of Petroleum(Beijing),Beijing 102249,China
Abstract：Using a seismic physical model,we study impact of aligned fractures on Q values of the model,and identify the relationship between fracture orientations and Q value changes.The physical model consists of three layers.The first layer is made of epoxy resin,and the third layer is made of mixed material.Both of them are isotropic layers.The second layer is a bakelite layer,simulating HTI media with aligned vertical fracture.2D data of three lines from different directions were acquired using the pulse-transmission method with the physical model submerged in a water tank.The pre-stack CDP gathers have been used to calculate Q of target zone by the method QVO(Q versus offset) based on the classical spectral ratio theory.According to the experiment analysis,Q of vertical fractured layer changes versus azimuth,where the biggest of Q value appears in the direction parallel to the fracture orientation and the smallest in the normal direction to the fracture orientation.This would be helpful for the fracture orientation detection.
