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为了准确解释地下构造形态,基于正演模型研究在地形起伏、固定基准面与浮动基准面之间填充速度不同等情况下,地下构造产生畸变或产生假构造的现象。结果表明,填充速度与目的层平均速度一致时地震剖面与模型一致,反映真实构造形态;当填充速度小于目的层平均速度时,地震剖面产状畸变与浮动基准面形态相同;当填充速度大于目的层平均速度时,地震剖面产状畸变与浮动基准面形态相反。用固定基准面制作构造图的方法来消除假构造的影响,反映了地下真实构造形态,解决了复杂地区构造保真问题,提高了勘探精度,保证了勘探质量。
In order to accurately explain the subsurface structure, the deformation of the subsurface structure or the fake tectonic phenomenon occurs under the circumstances that the topographic undulation, the filling velocity between the fixed datum and the floating datum are different based on the forward modeling. The results show that when the filling velocity is consistent with the average velocity of the target bed, the seismic profile is consistent with the model and reflects the true tectonic morphology. When the filling speed is less than the average velocity of the target bed, the occurrence distortion of the seismic profile is the same as that of the floating reference plane. Layer average velocity, the seismic profile of the occurrence of distortion and floating surface opposite form. The method of making a constructional map with a fixed reference surface eliminates the influence of fake structure, reflects the true underground structural form, solves the problem of structural fidelity in complex areas, improves the exploration accuracy and ensures the exploration quality.