摘要
随着油气田勘探开发进入以深层隐蔽型油气藏为主的阶段,古潜山油气藏成为勘探开发的主要目标之一。河间潜山内幕地层埋藏较深,内幕构造复杂,地震资料信噪比低,给潜山内幕精确成像和构造展布特征的落实带来了极大困难。介绍了基于双程波动方程的逆时偏移的基本原理,主要包括高阶有限差分波场外推算法和完全匹配层吸收边界条件两个方面。在分析河间潜山内幕特征的基础上,使用逆时偏移和传统叠前深度偏移对模型数据和实际资料进行了处理,结果表明逆时偏移能够对河间潜山内幕进行准确成像,其成像效果好于传统方法。
As the exploration and development spread to deep subtle reservoirs, the palaeo buried-hill reservoir becomes one of the major targets. The Hejian buried-hill inside is characterized by large depth, complicated structures and low S/N ratio, which brings about great challenges to the precise imaging and structure confirmation of the buried-hill inside. This paper presented the basic principle of reversetime migration based on the two-way wave equation, including higher-order finite difference wave field extrapolation algorithm and perfectly matched layer absorbing boundary conditions. After the characteristics of the Hejian buried-hill inside were analyzed, the reverse-time migration and traditional pre-stack depth migration were used to process the model data and actual data. The results show that the reverse-time migration can realize precise imaging of the Hejian buried-hill inside, with better performance than the traditional method.
引文
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