叠前AVAZ裂缝预测技术在车排子凸起的应用

近几年裂缝型油气藏越来越受到人们的重视，车排子凸起东翼石炭系发育高角度、高密度的火山岩裂缝储层。首先开展叠前P波反射系数的各向异性理论分析，然后结合工区特点进行裂缝地震响应正演模拟，并在此基础上对叠前地震资料进行方位角道集的划分，最后使用AVAZ裂缝预测技术完成裂缝空间展布特征预测。裂缝发育密度和方向预测结果与研究区成像测井资料具有良好的一致性，为该区今后的油气勘探与开发奠定了基础，也为车排子凸起其他地区的裂缝储层预测提供了技术思路。

Prestack AVAZ fracture prediction applied in Che-paizi Uplift

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.