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页岩气储层不同频谱分解算法应用效果对比分析 被引量:1
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作者 杨双安 宋晓乾 +1 位作者 杨柳鑫 田玉培 《河南理工大学学报(自然科学版)》 CAS 北大核心 2018年第6期66-70,共5页
页岩气勘探开发已经成为近年来能源领域新的研究热点,尤其是页岩气地震勘探成果越来越多,从地震资料中有效分析地震信息,寻找页岩气储层显得尤为重要。瞬时振幅属性有效地反映了页岩气富集特征。就如何提高页岩气储层识别的精度,以贵州... 页岩气勘探开发已经成为近年来能源领域新的研究热点,尤其是页岩气地震勘探成果越来越多,从地震资料中有效分析地震信息,寻找页岩气储层显得尤为重要。瞬时振幅属性有效地反映了页岩气富集特征。就如何提高页岩气储层识别的精度,以贵州绥阳页岩气区块为研究对象,采用不同的频谱分解算法(DFT,CWT,TFCWT,ST)对地震资料中的寒武系下统牛蹄塘组地层提取了地震信息。把不同频谱分解算法的道集在时间域和频率域内同时展现振幅随频率的变化特征,对比分析后发现,TFCWT及ST算法反映页岩气储层分辨率效果较好,可为页岩气气藏地震勘探资料反演提供技术方法支持。 展开更多
关键词 地震信息 页岩气储层 时频分析 频率道集 ST算法
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Frequency Diversity for OFDM Mobile Communication via Underwater Acoustic Channels 被引量:7
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作者 Gang Qiao Wei Wang +2 位作者 Ran Guo Rehan Khan Yue Wang 《Journal of Marine Science and Application》 2012年第1期126-133,共8页
The major constraint on the performance of orthogonal frequency division multiplexing (OFDM) based underwater acoustic (UWA) communication is to keep subcarriers orthogonal. In this paper, Doppler estimation and t... The major constraint on the performance of orthogonal frequency division multiplexing (OFDM) based underwater acoustic (UWA) communication is to keep subcarriers orthogonal. In this paper, Doppler estimation and the respective compensation technique along with various diversity techniques were deliberated for OFDM-based systems best suited for underwater wireless information exchange. In practice, for mobile communication, adjustment and tuning of transducers in order to get spatial diversity is extremely difficult. Considering the relatively low coherence bandwidth in UWA, the frequency diversity design with the Doppler compensation function was elaborated here. The outfield experiments of mobile underwater acoustic communication (UWAC) based on OFDM were carried out with 0.17 bit/(s-Hz) spectral efficiency. The validity and the dependability of the scheme were also analyzed. 展开更多
关键词 underwater acoustic channel orthogonal frequency division multiplexing (OFDM) underwateracoustic communication frequency diversity Doppler estimation Doppler compensation
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Calculation method of prestack FAGVO and its applications
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作者 Liu Xue-Qing Wang Yan-Chun +3 位作者 Zhang Gui-Bing Ma Sheng-Li Cheng Li-Fang Yu Wen-Wu 《Applied Geophysics》 SCIE CSCD 2016年第4期641-648,738,共9页
Frequency attenuation occurs when seismic waves propagate through the porous reservoirs containing hydrocarbons. Current researches on the seismic frequency attenuation mainly focus on the post-stack domain instead of... Frequency attenuation occurs when seismic waves propagate through the porous reservoirs containing hydrocarbons. Current researches on the seismic frequency attenuation mainly focus on the post-stack domain instead of the prestack domain. Here we propose the frequency attenuation gradient vs. offset (FAGVO) based on the amplitude variation with offset and frequency attenuation integral equations. We derive the FAGVO equation that equals to zero in a full-elastic medium and is negative in a viscoelastic medium. FAGVO is affected by the viscosity of the medium, the coefficients of reflection, the frequency variation, and high-frequency attenuation. FAGVO uses the differences of partially stacked data to decrease the interference caused by subsurface strata affecting the frequency attenuation, highlights the frequency attenuation gradient anomalies in hydrocarbon-bearing reservoir pores, and finally realizes the hydrocarbon fluid identification. The method was verified using a two-dimensional wave equation forward model and was found to be cost effective. Furthermore, the method does not require well information, which can be applied in the stage of seismic exploration, especially, in the exploration of a none-well project. 展开更多
关键词 FAGVO frequency attenuation hydrocarbon reservoir PRESTACK partial stack
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