GeoEast海洋特色处理技术在天然气水合物勘查中的应用

Application of GeoEast's characteristic marine processing methods in natural gas hydrate exploration

为了调查天然气水合物矿体的分布范围及厚度等信息,采用GeaEast系统海洋特色处理技术可有效提高地震资料信噪比和分辨率。首先,利用起伏海面相位驱动的虚反射衰减方法实现鬼波压制,采用综合多次波压制技术去除复杂多次波;然后,通过菲涅耳层析反演技术刻画海底近地表结构;最后,通过叠前深度偏移成像提高水合物层成像精度。实际资料处理结果表明,利用GeoEast特色处理技术能有效进行天然气水合物地震数据处理,明显提高了似海底反射层(BSR)的成像精度,为水合物勘查提供了高品质地震资料。

As the characteristic marine processing methods of the GeoEast system can effectively improve the signal-to-noise ratio(SNR)and resolution of seismic data,we use them to study the distribution and thickness of natural-gas-hydrate ore bodies.First,ghost suppression is achieved by the ghost reflection attenuation driven by the phase of the undulating sea surface,and the complex multiples are removed by integrated multiple suppression technology.Then,the near-surface structure of the seabed is characterized by the Fresnel tomographic inversion method.Finally,pre-stack depth migration imaging is employed to improve the imaging accuracy of hydrate layers.The actual data processing results show that the characteristic processing methods of GeoEast can well process the seismic data of natural gas hydrates,and the final profiles improve the imaging accuracy of the bottom simulating reflector(BSR),providing high-quality seismic data for hydrate exploration.