电子延迟器控制的三级震源叠加技术

在厚黄土层地表区地震数据采集中,多级延迟叠加震源方法具有先进性,但现今采用机械武打击片或螺旋式导爆管控制震源延时爆炸的方法,存在延时精度低、结构复杂、加工成本高及效率低等问题.使用电子雷管虽可较精准实现多级震源延迟叠加,但由于费用过高而难以大规模使用.文中介绍一种电子延迟技术控制多级震源叠加的方法,并详述地表控制电路(...

Electronic delayer-controlled three-stage seismic sources superposition

Multi-stage delay stacked source is advanced for seismic data acquisition in thick loess area. However, using a mechanical striker or a screw-type detonating tube to delay the explosion of seismic sources, there are many problems, such as low accuracy of time delay, high cost, complex structure and low efficiency. Although such delay can be achieved by using an advanced electronic detonator, it has not been widely used because of high cost. In this paper, we introduce a method of controlling the delayed explosion of seismic sources using an electronic delay technology, and give the schematic of the control circuit on the surface (referred to as a high-voltage encoder) and the delay circuit under the ground (referred to as a delayer). It is a new type of explosion system controlled by a multi-stage seismic source circuit. Taking the exploration project in Shanxi Province, we tested the system. The results show that the system can stably control three explosive columns to detonate from top to bottom accurately. The distance between the explosive columns is 1.7m, and the detonating time differs by 3ms. Keeping hole depth, charge size, receiver patch and folds constant, from the point of shot static correction record, the effective reflection energy of vertical delay three-magnitude source is strong than that of plane three-combination source in, the frequency band of the former is wider, the surface wave of the former is weaker and the exploration cost of the former is lower than the latter; from the point of seismic time section, the effective reflection energy and frequency band of vertical delay three-magnitude seismic source are equivalent to plane five-combination seismic source，and the cost of the former is reduced by about 70% to 80% on the latter. The multi-stage delay stacking method is useful for exploring coal and oil resources in the thick loess area.