塔里木盆地库车坳陷中部地震速度场的建立方法
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摘要
复杂构造地区速度场的建立对于准确进行时深转换十分重要,过去由于方法较为单一,影响了构造解释的精度及勘探成功率。为此,提出了利用高精度卫星照片结合地震相沉积相分析、有井约束反演、叠加速度谱分析、井资料分析等多信息对复杂构造地区速度场进行综合建模的方法技术。通过对各种信息统一校正及塔里木盆地库车坳陷中部砾石层及巨厚盐体的速度变化规律的分析,精细建立了各控制层的速度场,进而消除了地震剖面中时间域里的伪构造,在塔里木盆地库车坳陷取得了良好的勘探效果。
To establish the velocity field in the areas with complex structures is critical for accurate time-depth conversion.However,previous methods of establishing the velocity field are relatively simple and less selective so as to result in either low accuracy of structure interpretation or a low success ratio of exploration.Therefore,an integrated method of building the velocity field in the areas with complex structures was presented here by adopting high-resolution satellite images,in combination with the analysis of seismic facies and sedimentary facies,well-constrained inversion,the analysis of stacked velocity spectrum and the analysis of well data.Based on the unified correction of various data and the analysis of the velocity changing patterns of the gravel layer and very thick salt body in the study area,a fine velocity field was established for each horizon marker to eliminate false structures in time-domain on seismic sections.This method has been successfully applied in the Kuqa Depression of the Tarim Basin and can be recommended to use in other areas with complex structures.
To establish the velocity field in the areas with complex structures is critical for accurate time-depth conversion.However,previous methods of establishing the velocity field are relatively simple and less selective so as to result in either low accuracy of structure interpretation or a low success ratio of exploration.Therefore,an integrated method of building the velocity field in the areas with complex structures was presented here by adopting high-resolution satellite images,in combination with the analysis of seismic facies and sedimentary facies,well-constrained inversion,the analysis of stacked velocity spectrum and the analysis of well data.Based on the unified correction of various data and the analysis of the velocity changing patterns of the gravel layer and very thick salt body in the study area,a fine velocity field was established for each horizon marker to eliminate false structures in time-domain on seismic sections.This method has been successfully applied in the Kuqa Depression of the Tarim Basin and can be recommended to use in other areas with complex structures.
引文
[1]张华军,王海兰,肖富森,等.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.
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[4]谢锐杰,朱广生,漆家福,等.声波测井资料在平均速度场中的应用[J].西南石油学院学报,2003,25(1):9-11.
[5]邵雨,李学义,孔智勇,等.模型速度建场方法的应用研究[J].石油地球物理勘探,2003,38(6):675-679.
[2]杨智仁.四川东部高陡构造的归位处理研究[J].石油地球物理勘探,1991,30(4):1-11.
[3]梁顺军,梁顺郴.高陡背斜地震剖面高点偏离问题分析及其校正[J].石油地球物理勘探,2001,36(1):105-114.
[4]谢锐杰,朱广生,漆家福,等.声波测井资料在平均速度场中的应用[J].西南石油学院学报,2003,25(1):9-11.
[5]邵雨,李学义,孔智勇,等.模型速度建场方法的应用研究[J].石油地球物理勘探,2003,38(6):675-679.
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