全数字地震勘探技术应用效果及展望
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摘要
传统数字地震勘探将模拟检波器输出的模拟信号输入到数字地震仪采集站或中心站进行模数转换、数据编排、存储,在资料处理中心进行后加工处理。全数字地震勘探采用数字检波器系统,数字检波器输出的数字信号以数字方式传输到中心站进行编排、存储,在资料处理中心进行数字组合叠加处理和后加工处理。其优势在于提高了信号传输过程中的抗电磁干扰能力,提高了信号瞬时动态范围,展宽了信号频带,有利于提高地震资料的信噪比和分辨率。在中国石油已累计采集全数字二维6485km,三维936km2,资料品质得到明显改善。
According to conventional seismic exploration technology, analog signals exported from analog geophones are imported into digital seismograph acquisition units or key stations for analog-digital conversion, data arrangement, and storage, and then are reprocessed in data processing centers. However, based on full-digital seismic exploration technology, the digital geophone system is employed, as well as digital signals exported from digital geophones are digitally transmitted into key stations for arrangement and storage. At last, the digital signals are processed by using the technology of digital combination and superposition and reprocessed in data processing centers. As compared to the conventional technology, the new one improves the capability for resisting electromagnetic interference in transmitting signals, enhances the instantaneous dynamic range of signals, broadens frequency bands of signals, and is favorable for improving the signal-noise ratio and resolution of seismic data. PetroChina has so far cumulatively acquired 6,485 kilometers of 2D full-digital seismic data and 936 square kilometers of 3D full-digital seismic data, of which the quality is obviously improved.
According to conventional seismic exploration technology, analog signals exported from analog geophones are imported into digital seismograph acquisition units or key stations for analog-digital conversion, data arrangement, and storage, and then are reprocessed in data processing centers. However, based on full-digital seismic exploration technology, the digital geophone system is employed, as well as digital signals exported from digital geophones are digitally transmitted into key stations for arrangement and storage. At last, the digital signals are processed by using the technology of digital combination and superposition and reprocessed in data processing centers. As compared to the conventional technology, the new one improves the capability for resisting electromagnetic interference in transmitting signals, enhances the instantaneous dynamic range of signals, broadens frequency bands of signals, and is favorable for improving the signal-noise ratio and resolution of seismic data. PetroChina has so far cumulatively acquired 6,485 kilometers of 2D full-digital seismic data and 936 square kilometers of 3D full-digital seismic data, of which the quality is obviously improved.
引文
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[2]汉泽西,等.地震检波器发展初探[J].石油仪器,2006,20(6):1～4
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[4]史松群,等.苏里格气田全数字地震勘探技术及应用[J].中国石油勘探,2007,12(3):33～42
[2]汉泽西,等.地震检波器发展初探[J].石油仪器,2006,20(6):1～4
[3]罗福龙.地震勘探中的电磁干扰[J].石油仪器,2004,18(2):1～4
[4]史松群,等.苏里格气田全数字地震勘探技术及应用[J].中国石油勘探,2007,12(3):33～42
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