高密度三维地震技术在新河煤矿的应用

Application of High-density 3D Seismic Technology in Xinhe Coalmine

山东济宁煤田新河煤矿延深区由于地质构造复杂,常规三维地震勘探及二次精细化处理解释地震地质成果均不能满足煤矿开采需要,因此矿方对该区开展了高密度三维地震勘探。高密度三维地震野外原始数据采集采用小道距、高覆盖、宽方位角观测系统,进一步提高了资料的信噪比、分辨率和保真度。地震资料成像采用克希霍夫叠前时间偏移技术,提高了构造成像精度。通过与常规三维地震资料对比,新生界底界面、侏罗系上部厚层岩浆岩顶底界面及侏罗系底界面、主采3#煤层、深部16#煤层反射波在高密度三维地震时间剖面上有了明显的改善;采空区反射特征明显,时间剖面及振幅属性显示其边界与实际开采边界吻合较好;褶曲形态及断层组合及分布更加合理,取得了较好的应用效果。该项目的成功应用为高密度三维地震勘探技术在山东省煤矿采区的推广应用积累实践经验,具有一定的指导和借鉴作用。

Due to the complex geological structure of Xinhe coal mine extension area in Jining coal field of Shandong province,the conventional 3D seismic exploration and secondary refined processing and interpretation of seismic geological results can not meet the needs of coal mining,so the mining party has carried out high-density 3D seismic exploration in this area.The high-density 3D seismic field original data acquisition adopts a small track spacing,high coverage,wide azimuth observation system,which further improves the data's signal-to-noise ratio,resolution and fidelity.Kirchhoff prestack time migration technology is used for seismic data imaging,which improves the accuracy of structural imaging.Compared with conventional 3D seismic data,the reflection wave of Cenozoic bottom interface,the top and bottom interface of thick magmatic rock in the upper part of Jurassic,the bottom interface of Jurassic,the main coal seam 3 and the deep coal seam 16 has been significantly improved on the high-density 3D seismic time profile;The reflection characteristics of goaf are obvious,and the time profile and amplitude attribute show that its boundary is in good agreement with the actual mining boundary;The fold shape and fault combination and distribution are more reasonable,and good application effect has been achieved.The successful application of this project has accumulated practical experience for the popularization and application of high-density 3D seismic exploration technology in coal mining areas of Shandong province,and has certain guidance and reference functions.