THE SEISMIC DATA PROCESSING STRATEGY FOR AN UNCONVENTIONAL MONITORING SYSTEM:TAKING THE PAKISTAN GAS HYDRATE SURVEY FOR EXAMPLE
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摘要:
巴基斯坦外海发育有大量水合物，为研究水合物的分布特征，在此区域部署了多条多道地震测线。受客观条件制约，此次采集的地震资料覆盖次数低，电缆长度短，电缆噪音严重且存在空白道，这些不利因素要求在数据处理中必须采用非常规处理方法。指导思想是变非常规地震数据处理为常规数据处理，在数据处理时要灵活变通，这既包括处理流程参数的变通，也包含流程的组合变通。处理的核心问题是如何增强剖面的信噪比，在处理中通过3A去噪、空白道插值、相邻CMP道集合并、偏移等技术手段提高了剖面的信噪比，整体上处理后的剖面可以满足落实水合物分布特征的要求，达到了处理的目的。
Abstract:Gas hydrate is quite rich in offshore Pakistan. In order to pursue the occurrence of gas hydrate, multiple channel seismic survey was deployed. The data, however, was unconventional due to the acquisition environment which is only 1.2 fold and short in cable, rich in serious cable noise and of missing data sometimes. Therefore, the data need a special flow for processing. The key principle of data processing is to transform the unconventional seismic data processing into the conventional. Both the parameters of the module and the combination of the flow might be changed for conventional data processing. The key point is to increase the signal to noise ratio and the flow, including anomalous amplitude attenuation, missing data interpolation, adjacent CMP gather summation and migration. The processed section may satisfy the requirements of gas hydrate exploration.
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Key words:
- gas hydrate /
- BSR /
- unconventional seismic data processing /
- Pakistan
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