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高密度宽方位地震采集技术在四川盆地内江—大足区块页岩气勘探中的应用
Application of high-density and wide-azimuth seismic acquisition to shale-gas exploration in Neijiang-Dazu Block, Sichuan Basin
邱 健 郑马嘉 安 辉 黄 平 杨梦薇
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DOI:
作者单位:中国石油西南威远东页岩气作业分公司
中文关键字:高密度 宽方位 观测系统 采集 信噪比 分辨率 页岩气 四川盆地
英文关键字: High-density; Wide-azimuth; Observation system; Acquisition; Signal-to-noise ratio (SNR); Resolution; Shale gas; Sichuan Basin
中文摘要:四川盆地内江—大足区块目的层志留系下统龙马溪组埋藏较深(3 500 ~ 4 200 m),现有地震资料观测系统的覆盖
次数较低,最大炮检距较小,难以满足深层海相页岩气勘探要求。因此,2016 年在该区块实施了高密度宽方位三维地震采集,获
得了具有方位角信息的道集资料,有利于进行叠前反演,同时使裂缝预测、提取地层速度和各向异性参数成为可能。通过分析该
区块页岩气地震勘探面临的主要问题,介绍了高密度宽方位地震采集技术在该区块的应用效果,为水平井论证和地质导向提供了
技术支持。结论认为:高密度宽方位地震勘探技术采用小面元,提高了空间采样率,减少了空间假频,同时高覆盖次数有利于压
制噪声,因而具有进一步提高分辨率和改善信噪比的能力;通过高密度宽方位地震技术可以获得高品质的地震资料,对寻找“甜点”
区、改善勘探开发效果以及指导水平井钻井及压裂改造,具有重要的现实意义。

DOI: 10.12055/gaskk.issn.1673-3177.2018.01.005

 

英文摘要:The target, the Lower Silurian Longmaxi Formation in Neijiang-Dazu Block, Sichuan Basin, is deeply buried ranging from
3 500 m to 4 200 m. The existing seismic-data observation system shows lower coverage fold and smaller maximum offset, bringing
about exploration challenge of deep marine shale gas. The high-density and wide-azimuth 3D seismic-data acquisition was carried out
in this block in 2016. The trace gather data including azimuth obtained is favorable for the pre-stack inversion and enables the prediction
of fractures and the picking of formation velocity and anisotropy. In this study, the main challenge for shale-gas seismic survey
was analyzed, and the application effect of the acquisition were presented, thus providing technical support for horizontal-well demonstration
and geo-steering. It is concluded that the acquisition is capable of improving resolution and signal-to-noise ratio (SNR), with
small bins adopted to enhance the spatial sampling ratio and reduce the spatial alias and high folds favorable for noise suppression.
Furthermore, it can provide high-quality seismic data, which is of practical significance to identify "sweet spots", improve exploration
and development results, and guide horizontal-well drilling and fracturing.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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