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常规地震在我国主要的煤层气勘探区效果不佳,原因之一是这些地区地表条件复杂,速度结构变化剧烈,利用RVSP层析成像技术能够为地震资料处理提供精确的速度模型.本文首先利用试射法射线追踪RVSP波场传播路径,研究其运动学特征,同时采用高阶有限差分算法对层状介质RVSP进行正演模拟,分析其波场传播特征.其次,拾取模拟记录初至,利用SIRT反演算法重建模型速度场,验证了该方法的可行性与可靠性.将该方法运用到煤层气复杂地区,重建勘探区的速度结构信息,同时为了验证速度模型的正确性,用该速度模型进行层析静校正处理,获得较好的效果.
One of the reasons why conventional earthquakes are ineffective in the main CBM exploration areas in China is that the surface conditions in these areas are complex and the velocity structure changes drastically.Using RVSP tomography technology can provide an accurate velocity model for seismic data processing.Firstly, Radial ray tracing of RVSP wavefield propagation path to study its kinematics characteristics, at the same time using high-order finite difference algorithm to forward modeling of layered media RVSP, analysis of its wavefield propagation characteristics.Secondly, pick up the first simulation record, the use of SIRT The inversion algorithm is used to reconstruct the velocity field of the model to verify the feasibility and reliability of the proposed method.Applying this method to complex CBM regions to reconstruct the velocity structure information of the exploration area, and in order to verify the correctness of the velocity model, Chromatographic static correction processing, get better results.