宽/窄方位角勘探实例分析与评价(一)
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摘要
近年来,人们对开展宽方位角观测的优点有了比较全面的了解,但对于宽方位角观测一定要有更高的覆盖次数及更小的面元,即更昂贵的采集费用,有些望而却步。为此,本文通过在中国西部准噶尔盆地实际采集的宽方位角地震数据,以岩性储层为勘探目标进行了宽/窄方位角观测效果的对比分析,研究中采用严格相对保持振幅的提高分辨率处理,并依据沿储层地震属性的差异评价宽/窄方位角在勘探岩性储层上的能力。研究结果表明:在地层较平坦(盆地腹部)的地区和地震数据具有一定信噪比的条件下,针对岩性地震勘探而言,宽方位角(纵横比大于0.5)地震勘探比窄方位角可获得更高的空间成像分辨率,而且不一定需要更高的覆盖次数,对于岩性勘探来说有60-80次覆盖即可满足勘探要求。
In recent years,the people has gradually had comprehensive knowledge of superiority of implementing wide azimuth survey but flinched from more expensive acquisition cost because of higher folds and smaller bin size for wide azimuth survey. For that reason,through wide azimuth seismic data practically acquired in Junggar basin of the west China and taking the lighologic reservoirs as the explored targets, the paper conducted the correlation and analysis of wide/narrow azimuth surveying effects. In studyings, we adopted processing techniques improving resolution in which the amplitude is strictly relative preserved and appreciated the ability of wide/narrow azimuth in exploring lithologic reservoirs on the basis of the difference of seismic attributes along the reservoirs. The studied results showed that in view of lithologic seismic exploration, the wide azimuth (aspect is greater than 0. 5) has better spatial imaging resolution than narrow azimuth while is unnecessary to keep high folds that are 60-80 folds being enough to meet exploration demand on lithologic exploration in conditions of the areas having flat beds (hinterland of basin) and seismic data having certain S/N ratio.
In recent years,the people has gradually had comprehensive knowledge of superiority of implementing wide azimuth survey but flinched from more expensive acquisition cost because of higher folds and smaller bin size for wide azimuth survey. For that reason,through wide azimuth seismic data practically acquired in Junggar basin of the west China and taking the lighologic reservoirs as the explored targets, the paper conducted the correlation and analysis of wide/narrow azimuth surveying effects. In studyings, we adopted processing techniques improving resolution in which the amplitude is strictly relative preserved and appreciated the ability of wide/narrow azimuth in exploring lithologic reservoirs on the basis of the difference of seismic attributes along the reservoirs. The studied results showed that in view of lithologic seismic exploration, the wide azimuth (aspect is greater than 0. 5) has better spatial imaging resolution than narrow azimuth while is unnecessary to keep high folds that are 60-80 folds being enough to meet exploration demand on lithologic exploration in conditions of the areas having flat beds (hinterland of basin) and seismic data having certain S/N ratio.
引文
[1] Williams M and Jenner E . Interpreting seismic data in the presence of azimuthal anisotropy or azimuthal anisotropy in the presence of the seismic interpretation. The Leading Edge,2002, 21(8):771-774
[2] Cordsen A . Narrow-versus wide-azimuth land 3 D seismic surveys. The Leading Edge, 2002, 21 (8): 764-770
[3] Hall S A et al. Fractured reservoir characterization using P-wave AVOA analysis of 3D OBC data. The Leading Edge, 2002,21(8) :777-781
[4] Moldoveanu N and Schneider C. PP and PS subsalt target illumination: a comparison study for different acquisition geometries. San Antonio SEG:56-59
[5] 凌云研究组．宽方位角地震勘探应用研究．石油地球物 理勘探,2003,38(4):350-357
[6] Cambois G et al. Wide-az-imuth acquisition: True 3D at last！. The Leading Edge, 2002, 21(8):763
[2] Cordsen A . Narrow-versus wide-azimuth land 3 D seismic surveys. The Leading Edge, 2002, 21 (8): 764-770
[3] Hall S A et al. Fractured reservoir characterization using P-wave AVOA analysis of 3D OBC data. The Leading Edge, 2002,21(8) :777-781
[4] Moldoveanu N and Schneider C. PP and PS subsalt target illumination: a comparison study for different acquisition geometries. San Antonio SEG:56-59
[5] 凌云研究组．宽方位角地震勘探应用研究．石油地球物 理勘探,2003,38(4):350-357
[6] Cambois G et al. Wide-az-imuth acquisition: True 3D at last！. The Leading Edge, 2002, 21(8):763
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