山区三维地震勘探大时差静校正及时深转换
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摘要
山地煤矿采区地形条件复杂,正确进行大时差静校正是处理好三维地震勘探资料的重要一环。大时差静校正会改变煤层反射波时间(t0)及双曲线特征,为减小校正误差,需设立一个CMP面,将校正量分为高频分量和CMP校正量。在地形高差变化剧烈的山地,不能用高于地表面的统一基准面为零线进行时深转换,须进行充填层时差(△t)校正,将统一基准面校正到地表面,再以地表面为零线进行时深转换成图。以便准确无误的展示煤层赋存形态,提高构造图精度。
In the mountainous coalmine area for complicated-surface,the correct big moveout static correction is an important step of processing 3D seimic's data. For changing of the coal layer's reflection-wave time(t0) and hyperbolic characters, we need to establish a CMP face and to divide correction-quantity into the high frequency quantity and the CMP correction quantity,accordingly minishing greatly the error of correction. In the mountain for landform's altitudinal-difference changing acutely, we can't regard uniform datum that higher than ground-surface as zero line to do time-depth transform, must do correction with moveout of filling-layer(△t), correct uniform datum to ground-surface, then regarding ground-surface as the zero line do time-depth transform and make map, so ensure the coal layer's configuration correct, increase to its construct map accuracy.
In the mountainous coalmine area for complicated-surface,the correct big moveout static correction is an important step of processing 3D seimic's data. For changing of the coal layer's reflection-wave time(t0) and hyperbolic characters, we need to establish a CMP face and to divide correction-quantity into the high frequency quantity and the CMP correction quantity,accordingly minishing greatly the error of correction. In the mountain for landform's altitudinal-difference changing acutely, we can't regard uniform datum that higher than ground-surface as zero line to do time-depth transform, must do correction with moveout of filling-layer(△t), correct uniform datum to ground-surface, then regarding ground-surface as the zero line do time-depth transform and make map, so ensure the coal layer's configuration correct, increase to its construct map accuracy.
引文
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