永城矿区复杂条件下的三维地震勘探技术

3D Seismic Survey Technique Under Complex Condition In Yongcheng Mining Area

针对永城矿区地表障碍物稠密、新生界地层厚度大、煤层不同程度地受到岩浆侵蚀等不利于地震勘探的特点,采用小线距、小偏移距技术解决了大规模障碍区信息不全的问题;采用宽方位角观测系统、宽频带接收、叠前三维地表一致性振幅补偿、三维地表一致性反褶积等手段最大限度地提高了地震资料的分辨率,提高了成像精度;解释过程中采用波阻抗反演与地震综合属性分析技术确定了岩浆岩侵入煤层的范围,利用相干体分析技术搞清了断层特别是小断层的发育情况,取得了良好的地质效果与经济效益。

In Yongcheng mining area,the stumbling block on earth-surface is dense,the Cenozoic group stratum is thick,the coal seam is eroded by magma in different degree, in view of these factors ,adopted small line distance ,small excursion distance to solve the problem of information lack in large-scale obstacle area;enhanced the material resolution maximumly and increased the imagery precision by using method such as width azimuth observation system,wideband receive system ,3D-folds earth-surface uniform swing compensate,3D earth-surface uniform deconvolution and so on. In the process of Explanation,used the technique of wave impedance inversion and seismic survey synthetic attributes analysis to determine the scope that magmatic rock invased coal bed,used the technique of coherent body analysis clarified growth situation of the fault, specially the small fault, has obtained good geological effect and economic efficiency.