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当不正确的速度场应用于从时间向深度转换时,地震深度偏移可导致假的反射层定位和严重的干扰。在速度模型中,假设将各向异性的岩石描述成各向同性是一个主要的误差源,那么通过这种逼近法不可能消除独立的测量反射。不同的测量方法如VSP和联络巷道反射地震法具有地下相重叠的反射体特征。不仅在深度偏移上能产生一致的反射,而且还可以确定一致的速度模型。应用实测数据作为实例,在各向异性与速度模型结合时,可成功地获得两个目标体。
Seismic depth migration can lead to false reflective layer positioning and severe disturbances when incorrect velocity fields are applied from time to depth. In the velocity model, assuming anisotropic rocks are described as being a major source of error, it is not possible to eliminate the independent measurement reflections by this approximation. Different measurement methods such as VSP and contact alley reflectance seismic method have the features of underground reflector overlap. Not only can a consistent reflection be generated at depth shifts, but a consistent velocity model can also be determined. Using the measured data as an example, two target bodies can be successfully obtained when the anisotropy and the velocity model are combined.