变速成图技术在准噶尔盆地南缘冲断带的应用
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摘要
准噶尔盆地南缘冲断带地区的地震资料长期以来由于基准面、填充速度不统一,存在地震解释层位不闭合,新、老资料难以统一使用的问题,各年度的地震地质成果解决的也仅是局部构造的分布问题,不适应该区以"整体评价、重点突破"为指导思想的油气勘探、开发的需要。基准面统一处理后的地震资料较好地解决了以上问题,使该区的地震资料能进行区域性的速度分析、速度建模和构造转深连片成图,变速成图技术在该区取得了较好的应用效果;解释成果也能从较大区域上连片成图及构造分析研究,区域成图和构造转深的精度有较大提高;还发现了玛北潜伏构造及霍、玛、吐下盘构造,较客观地查明了南缘冲断带各构造的形态、圈闭规模、构造细节变化及构造间的接触关系。为该区的勘探开发提供了重要的基础资料,效果显著。
As no unified data base level or filling rate has been established for processing the seismic data acquired in the thrust belt in the southern margin of the Junggar Basin,miss-tie occurs in some seismic horizons,and the old and new seismic data cannot be used conformably.What the previous seismogeological research defines is the distribution of local structures,thus the thrust belt in the southern margin cannot be evaluated as a whole.These problems are successfully solved after a unified data base level is established.It is possible to perform regional velocity analysis,velocity modeling and continuous formation mapping through time-depth conversion.The varying velocity mapping technique is successfully applied to the thrust belt in the southern margin.The seismic interpretation results can be used to perform regional and continuous mapping and structural analysis.The accuracies of regional mapping and time-depth conversion are significantly enhanced.The North Malas buried structures and the Huo'erguosi,Malas and Tugulu footwall covered structures are identified.The structural shape,trap size,fine variation of structures and contact relationships between structures are well defined.All these provide important basic data for exploration in the study area.
As no unified data base level or filling rate has been established for processing the seismic data acquired in the thrust belt in the southern margin of the Junggar Basin,miss-tie occurs in some seismic horizons,and the old and new seismic data cannot be used conformably.What the previous seismogeological research defines is the distribution of local structures,thus the thrust belt in the southern margin cannot be evaluated as a whole.These problems are successfully solved after a unified data base level is established.It is possible to perform regional velocity analysis,velocity modeling and continuous formation mapping through time-depth conversion.The varying velocity mapping technique is successfully applied to the thrust belt in the southern margin.The seismic interpretation results can be used to perform regional and continuous mapping and structural analysis.The accuracies of regional mapping and time-depth conversion are significantly enhanced.The North Malas buried structures and the Huo'erguosi,Malas and Tugulu footwall covered structures are identified.The structural shape,trap size,fine variation of structures and contact relationships between structures are well defined.All these provide important basic data for exploration in the study area.
引文
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[3]唐必锐.四川东部高陡构造深转换方法研究[J].天然气工业,2005,25(8):41-43.
[4]张华军.基于反射层的变层速度模型时深转换方法[J].天然气工业,2003,23(1):36-38.
[5]张华军,肖富森,刘定锦,等.地质构造约束层速度模型在时深转换中的应用[J].石油物探,2003,42(4):521-525.
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