地震资料宽频处理技术在天然气水合物矿体描述中的应用研究

Application of Broadband Seismic Data Processing Technology in the Description of Natural Gas Hydrate Ore Body

针对天然气水合物钻探难以有效解决的矿体空间展布等难点,提出一套基于自适应鬼波压制技术的地震宽频处理技术,有效改善资料分辨率。首先采用上下行波场分离的鬼波压制技术实现对震源端和电缆端鬼波的压制;然后通过高精度网格层析反演速度建模技术获取高质量速度场,利用叠前深度偏移成像进一步提高水合物层成像精度。实践表明,相对于常规处理而言,宽频处理的水合物地震特征更清晰,细节信息更丰富,有利于天然气水合物矿体的准确描述。

A set of seismic data broadband processing technology based on adaptive ghost wave suppression is proposed to improve the resolution of data,which is difficult to be solved in natural gas hydrate(NGH)drilling.Firstly,ghost wave suppression technology based on upstream and downstream wave field separation is used to suppress the ghost wave of source and cable.Then the high quality velocity field is obtained by high precision grid tomography inversion velocity modeling technology while the imaging accuracy of hydrate layer is further improved by prestack depth migration imaging.The practice shows that compared with the conventional treatment,the broadband treatment provides clearer seismic characteristics and more detailed information,which is more conducive to the accurate description of the NGH ore body.