四川复杂山地煤炭三维地震勘探效果

以GLSP煤矿三维地震勘探为例,针对勘探区内复杂山地条件、表浅层及深层地震地质条件下进行激发参数选择实验,确定了适合该区三叠纪砂质泥岩、砾屑灰岩、泥质粉砂岩和石灰岩等四种不同裸露基岩的施工方法,即三小（小道距、小线距、小面元）三高（高频记录、高采样率、高爆速成型炸药）三维地震勘探的野外数据采集方法,并提出了满足山地特点的精细地震资料数字处理技术及流程,解释采用人机联作加全三维立体可视化技术。本次勘探查明勘探区内落差大于等于5m的断层38条,控制主采煤层C13、C19、C25的赋存形态及深度,并预测了主采煤层的厚度变化趋势,对陷落柱的平面分布形态、垂向延伸变化规律及老窑采空区的分布范围进行了解释。

3D Seismic Prospecting Effect in Sichuan Complex Mountainous Area Coalmines

Taking the GLSP coalmine 3D seismic prospecting as an example,in allusion to prospecting area complex mountainous condition,near surface,shallow and deep seismic-geologic condition,carried out shot parameter selection test,determined operation method adaptable to Triassic sandy mudstone,calcirudite,argillaceous siltstone and limestone four kinds of exposed rock area： that is ＂3S＂（i.e.small group interval,small line spacing and small bin） and ＂3H＂（i.e.high-frequency recording,high sampling rate and high velocity packaged explosive） 3D seismic field data gathering method.Then precise seismic data digital processing technology and process suitable to mountainous regions,man-computer interaction interpretation and full 3D visualization technology have been put forward.In this exploration,38 faults with throw ≥ 5m have found,occurrences and depths of main mineable coal seams C13,C19 and C25 controlled and their thickness variation trend predicted.Besides,subsided column horizontal distribution configuration and vertical extending variation change pattern,gob area distribution range have been interpreted.