Prestack AVAZ fracture prediction applied in Che-paizi Uplift
YU Xiaodong1,2, GUI Zhixian1,2, WANG Yong1,2, WANG Jingling3
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China; 2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China; 3. Unconventional Petroleum Research Institute, China University of Petroleum(Beijing), Beijing 102249, China
Abstract：In recent years, more and more attention has been paid to fractured oil and gas reservoirs.Carboniferous volcanic fractured reservoirs were well developed in the east part of Chepaizi Uplift.Conventional methods can hardly predict this kind of reservoirs.We demonstrate in this paper our prediction with the amplitude variation with azimuth (AVAZ) to solve the problem.First the anisotropy of reflection coefficient of prestack P-wave is analyzed.Then the forward modeling of seismic response of fractures is carried out in combination with characteristics of the working area.On this basis, azimuth gathers of prestack seismic data are divided.Finally the fracture spatial distribution characteristics is predicted with AVAZ.The predicted fracture density and direction are in good agreement with logging data in the study area, which lays a foundation for the future exploration and development in this area, and also provides technical references for the fracture reservoir prediction in similar areas.
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