新疆伊犁山区高分辨三维地震采集技术应用
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摘要
新疆伊犁三维地震勘探区属丘陵地貌特征,地形复杂,松散层较厚,潜水位较深,激发的地震波频率低,存在较强的低频干扰和变频随机干扰,地震地质条件差。野外采集采用车载钻机成孔及人工成孔、检波器串并联组合及32次高覆盖,并进行以高分辨率、高信噪比、高保真度为目标的资料处理,资料解释以垂向时间剖面解释为主,利用已有钻探资料,结合水平时间切片、方差体切片、三维可视化等技术,不仅查明了新生界厚度变化情况及煤系地层的起伏形态,并合理的圈定了各个煤层的厚度变化趋势。
A 3D seismic prospecting area in the Ili Prefecture,Xinjiang presents a hilly topography with complicated landform,rather thick loose beds,and deep groundwater level.The frequency of seismic wave shot is rather low,so strong low-frequency and frequency-changing random interferences are existed,thus poor seismic-geologic conditions.Field data acquisition uses truck-mounted drilling rig hole completion,series and parallel connected geophone combination and highly 32 times fold.Data processing is with target to high resolution,high signal-to-noise ratio and high fidelity.Data interpretation uses mainly vertical time sections,supplemented by available drilling data,combined with horizontal time and variance cube slices and 3D visualization techniques,not only found out Cenozoic strata thickness variation and coal measures strata undulation,but also delineated thickness changing trend for each coal seam.
A 3D seismic prospecting area in the Ili Prefecture,Xinjiang presents a hilly topography with complicated landform,rather thick loose beds,and deep groundwater level.The frequency of seismic wave shot is rather low,so strong low-frequency and frequency-changing random interferences are existed,thus poor seismic-geologic conditions.Field data acquisition uses truck-mounted drilling rig hole completion,series and parallel connected geophone combination and highly 32 times fold.Data processing is with target to high resolution,high signal-to-noise ratio and high fidelity.Data interpretation uses mainly vertical time sections,supplemented by available drilling data,combined with horizontal time and variance cube slices and 3D visualization techniques,not only found out Cenozoic strata thickness variation and coal measures strata undulation,but also delineated thickness changing trend for each coal seam.
引文
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[2]张德元,陈光明,严震乾.高密度三维地震勘探在四川复杂山区的应用[C]//中国煤炭学会矿井地质专业委员会2010年学术论坛论文集.江苏徐州:中国矿业大学出版社,2010.
[3]原明林.三维地震勘探在晋煤集团成庄矿的应用分析[J].中国煤炭地质,2008,20(6).
[4]石君华.不同地形条件下的三维地震数据采集[J].河北工程大学学报(自然科学版),2001,18(02).
[5]张爱印.灿岩覆盖区三维地震勘探方法研究[J].中煤炭地质,2010,22(06).
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