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地震勘探是目前寻找石油、天然气的主要手段,而从地震数据的分析中提取地层的速度资料—速度谱—又是地震数据处理中的重要一环.常规速度谱是对记录到的浮点地震数据进行计算的.取原始地震记录的符号位可得到每个数据只用一个二进位表示的符号位地震记录.本文用最小二乘法原理论证了在一定的假定条件下,可以对这种符号位数据进行类似于相关的运算—符号谱—来提取速度参数.这种方法从计算角度上讲能大大节省机器的内存和运算时间.本文从符号位把地震记录改造成等振幅波这一特性出发论述了符号谱具有能量团集中、分辨率高、层次清楚、连续性好、容易突出中、深层弱能量反射波和压制一些强随机干扰的特点.本文提出并讨论了实现符号谱的比较好的算法,并且在719机上进行了实践.实践结果证明,计算一个符号谱比做一个常规相关谱节省了40%的时间.本文附有用实际资料作符号谱和常规相关谱计算所得结果图的比较.比较全面地证明了上述符号谱的特点.
Seismic exploration is the main means to find oil and natural gas at present, and the extraction of velocity data - velocity spectrum from seismic data analysis is an important part of seismic data processing. Data to calculate the sign of the original seismogram can be obtained by each data only one binary symbolic bit seismogram recorded in this paper using the principle of least squares to demonstrate that under certain assumptions, Data similar to the related operation - the symbol spectrum - to extract the speed parameters.This method from the computational point of view can greatly save the machine’s memory and computing time.This article from the symbol bit to seismic records into equal amplitude wave of this feature This paper discusses that the symbol spectrum has the characteristics of energy cluster, high resolution, clear level, good continuity, easy to highlight the weak energy reflected wave in the middle and deep layers and suppress some strong random disturbances.This paper proposes and discusses the better symbol spectrum Algorithm, and carried out on the 719 machine.Experimental results show that the calculation of a symbol spectrum ratio as a regular correlation spectrum section 40% of the time. Tablature herein comparison with the conventional correlation and spectrum calculation results obtained by the actual data for FIG. Comprehensively demonstrated above tablature characteristics.