论文部分内容阅读
地球物理勘探中公认地震资料垂向分辨率极限为1/4地震波长.根据地震资料主频与层速度即可计算出地震资料的空间垂向分辨率,将小于此厚度的地层定义为薄层.薄层一般具有厚度薄、横向变化迅速、各向异性强等问题,要识别地震资料定义的薄层需要比地震资料拥有更高的垂向分辨率.因此从带限地震资料计算出宽频资料是识别薄层的有效方法.基追踪能从带限地震资料中计算出宽频资料提高地震资料对薄层的识别能力.通过不同频率地震子波合成地震记录,对比基追踪方法计算结果,发现基追踪对频率不敏感.为研究噪对声基追踪的影响,向模型增加噪声,结果证明基础追踪具有一定的抗噪能力.基追踪方法突破了1/4地震波长的垂向极限分辨率,且结果与模型吻合度极高.将该方法应用于实际油气田中,宽频资料与测井数据吻合较高,实际应用中效果明显.
The vertical resolution limit of recognized seismic data in geophysical exploration is 1/4 seismic wavelength, and the vertical spatial resolution of seismic data can be calculated according to the frequency and velocity of seismic data, and the stratum less than this thickness is defined as thin layer Thin layers generally have the problems of thin thickness, rapid lateral variation, strong anisotropy and so on, so it is necessary to identify thin layers defined by seismic data which have higher vertical resolution than seismic data. Therefore, the broadband data Is an effective method to identify thin layers.Based on the calculation of broadband data from band-limited seismic data, base-tracking can improve the ability of seismic data to recognize thin layers.Based on seismic records with different frequency seismic wavelets and contrast-based tracking methods, Tracking is insensitive to frequency.In order to study the influence of noise on the sounding pursuit, adding noise to the model, the result shows that the basic tracking has a certain anti-noise ability.The basic tracking method breaks through the vertical limit resolution of 1/4 seismic wavelength The results are in good agreement with the model.When the method is applied to actual oil and gas fields, the broadband data agree well with the well logging data, and the effect is obvious in practical application.