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根据中国西南部四川盆地中部龙岗地区的地质构造,制作出一个小裂缝尺度、多种裂缝参数、成比例的裂缝储层地震物理模型。采用薄片模拟裂缝的方法制作可变参数的小尺寸裂缝带,模拟一定区域内所有裂缝的等效特征。该模型是对裂缝物理模型技术的一个新尝试。通过进行数据采集和处理,得到分方位数据。然后分析4个裂缝密度变化的裂缝带其中心位置处振幅随入射角的变化情况,最后采用振幅和频率衰减梯度两种属性的方位各向异性预测裂缝发育区。结果显示,裂缝带中心位置处振幅具有方位各向异性的特征,方位振幅的拟合结果表明预测的裂缝方位是90°,预测的4个裂缝密度值是增加的趋势,都与模型设计相符。和振幅属性相比,频率衰减梯度属性的方位各向异性对小尺度裂缝更为敏感。
According to the geological structure of Longgang area in central Sichuan Basin in southwestern China, a small fracture scale, various fracture parameters and a proportional physical model of fracture reservoir seismicity are produced. A small-scale fracture zone with variable parameters was fabricated by simulating a crack in a thin slab to simulate the equivalent characteristics of all fractures in a certain area. This model is a new attempt to crack physics model technology. Through the data acquisition and processing, sub-azimuth data. Then, the changes of the amplitude at the center of the fracture zone with the change of the incident angle were analyzed. Finally, the azimuthal anisotropy of the amplitude and the frequency attenuation gradient was used to predict the zone of fracture development. The results show that the amplitude at the center of the fracture zone is characterized by azimuthal anisotropy. The fitting results of azimuth amplitude show that the predicted fracture orientation is 90 ° and the predicted values of 4 fracture densities are increasing, which are consistent with the model design. The azimuthal anisotropy of the frequency-decaying gradient attribute is more sensitive to small-scale fractures than the amplitude attribute.