羌塘盆地天然气水合物反射地震资料处理关键技术及效果分析  

Key Techniques and Effect Analysis of Natural Gas Hydrate Reflected Seismic Data Processing in Qiangtang Basin

作　　者：周海娟[1] 匡朝阳[2] 袁兴赋 熊强青 Zhou Haijuan;Kuang Chaoyang;Yuan Xingfu;Xiong Qiangqing(Geological Exploration Technology Institute of Anhui Province, Hefei Anhui 230031, China;Geophysical Exploration Division No.6, Huadong Petroleum Bureau of SINOPEC, Nanjing Jiangsu 210009, China)

机构地区：[1]安徽省勘查技术院,安徽合肥230031 [2]中国石化集团华东石油局第六物探大队,江苏南京210009

出　　处：《工程地球物理学报》2020年第4期399-405,共7页Chinese Journal of Engineering Geophysics

基　　金：中国地质调查局天然气水合物勘查与试采专项(编号:GZHL20110305)。

摘　　要：在羌塘盆地开展地震探测,因特殊的地表和地震地质条件,原始资料受各种干扰波影响,信噪比较低,成像效果较差。首先针对这些特点,分析了原始记录及地质特征,并根据各种干扰波的特点,采取了相应的压制方法,通过多域组合去噪、去噪模块串联技术方法消除了各种干扰波影响,突出有效波信息,提高了资料的信噪比。然后分析了勘探区速度分析的难点,并针对性采取相应技术措施,获得了准确的叠加速度,使叠加达到最佳效果,最终成像剖面与叠加速度剖面有很好的对应性,准确的速度参数提高了资料解释的精度。研究表明,在羌塘盆地运用叠前去噪和速度分析关键处理技术适应性较强,对处理此类地区地震资料有一定的参考意义。Due to the special surface and seismic geological conditions in Qiangtang Basin,various interference waves affect the raw data and bring low signal-noise ratio and poor imaging effect in the process of seismic detection.This paper analyses the records and geological characteristics and adopts the corresponding suppression method according to the characteristics of various interference waves.The effect of various interference waves are eliminated by means of multi-domain composite de-noising and de-noising module series technology,the effective wave information is highlighted,and the SNR of the data is improved.The difficulties of velocity analysis in the exploration area have been analyzed to obtain the accurate superposition velocity by corresponding technical measures and achieve the optimal effect of superposition.Finally,the imaging profile has a good correspondence with the superposition velocity profile,and accurate speed parameters improve the accuracy of data interpretation.In Qiangtang basin,the key processing techniques of prestack noise elimination and velocity analysis with strong adaptability have a certain reference significance for processing seismic data in this area.

关 键 词：羌塘盆地 天然气水合物 地震资料处理 叠前去噪 速度分析 

分 类 号：P631.4[天文地球—地质矿产勘探]