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The mai n method used in petroleum prospecting i s seismic exploration.Seismic dynamite s ource is one of important factors in sei smic data acquisition. Based on the theo ry of explosive dynamics and elastic mec hanics, the relation of shock wave energ y transformed earthquake wave is analyze d. The mechanism of shock wave superimpo sed amplitude in vertical direction is r aised and simplify model is given as wel l. Through experimentation, the results have shown that the main frequency of th e earthquake...

The mai n method used in petroleum prospecting i s seismic exploration.Seismic dynamite s ource is one of important factors in sei smic data acquisition. Based on the theo ry of explosive dynamics and elastic mec hanics, the relation of shock wave energ y transformed earthquake wave is analyze d. The mechanism of shock wave superimpo sed amplitude in vertical direction is r aised and simplify model is given as wel l. Through experimentation, the results have shown that the main frequency of th e earthquake wave produced by the source is higher than ordinary seismic explosi ve columns. It is the ideally seismic so urce for high resolution seismic explora tion.

根据弹性波动理论 ,分析了装药爆炸时冲击波转换成地震波的能量关系 ,对多级小药量垂向延时震源地震波能量叠加的原理进行了研究 ,建立了简化模型。试验结果表明 ,垂向延时叠加震源可在保证一定的信噪比的前提下 ,提高地震波的主频率 ,是高分辨率地震勘探的较理想的激发震源

According to explosive theory,the paper analyzed the relation of energy transformed from shock wave into seismic wave when explosion by spherical charge,studied the principle of seismic energy stacked by using multilevel small charge sized and vertically delayed sources,which suggested that two level vertically delayed time depends on the interval of two level spherical charges and it must consider the radius of broken zone formed by explosion of one level spherical charge and the explosion save distance.Under...

According to explosive theory,the paper analyzed the relation of energy transformed from shock wave into seismic wave when explosion by spherical charge,studied the principle of seismic energy stacked by using multilevel small charge sized and vertically delayed sources,which suggested that two level vertically delayed time depends on the interval of two level spherical charges and it must consider the radius of broken zone formed by explosion of one level spherical charge and the explosion save distance.Under the condition of reasonable controlling on time of ignition of two level or multilevel spherical charge,the downgoing energy of seismic wave can be improved and the vibration of surface can be reduced.The experiment of vertically delayed stack source has been implemented by using the results of the theoretical analysis.The results showed that the vertically delayed stack source can increase the frequency of seismic wave in a precondition of ensuring a certain S/N ratio,that is ideal explosive source for high precision seismic exploration.

本文根据有关爆破理论,分析了球形装药爆炸时冲击波转换成地震波的能量关系,对多级小药量垂向延迟震源地震波能量叠加的原理进行了研究,认为两级垂向延迟时间取决于两级球形装药的距离,而且在确定此距离时要同时考虑一级球形装药爆炸所形成的粉碎区直径和炸药的殉爆距离。在合理控制两级或多级球形装药起爆时间条件下,能提高地震波的下传能量,同时减少地表的振动。根据这项理论分析结果,进行了垂向延迟叠加震源试验。试验结果表明,垂向延迟叠加震源可在保证一定信噪比的前提下,提高地震波的频率,是高精度地震勘探较理想的激发震源。

The Poisson's ratio, an important parameter to understand the interior of the earth, can be dertermined from the ratio of P_ to S_ seismic wave velocity. Teleseismic P waveform contains much information about the Ps converted wave and its multiples from discontinuities in the crust and the mantle, which can be used to acquire the average thickness and the Poisson's ratio of the crust by the H_k stacking method. Data from 68 broadband seismic stations located in the northwestern basin_mountain boundary of the...

The Poisson's ratio, an important parameter to understand the interior of the earth, can be dertermined from the ratio of P_ to S_ seismic wave velocity. Teleseismic P waveform contains much information about the Ps converted wave and its multiples from discontinuities in the crust and the mantle, which can be used to acquire the average thickness and the Poisson's ratio of the crust by the H_k stacking method. Data from 68 broadband seismic stations located in the northwestern basin_mountain boundary of the Bohai Bay Basin are processed, and the distributions of the average crustal thickness and Poisson's ratios are determined. We find that there is a distinct differentiation of Poisson's ratios in the study area. The distribution of Poisson's ratios on the flank of the mountain is rather uniform, while on the flank of the basin much variable. The comparison between Poisson's ratios and the surface geology manifests that there is an apparent response in the lower crust to the intense extension of the Bohai Bay Basin during Cenozoic. The Poisson's ratios deduced from seismology can be used to constrain the compostion of the crust in the study area.

泊松比做为了解地球内部介质一个非常重要的参数,在地震学上可以通过P波和S波速度的比值来确定.利用远震P波波形记录中包含的壳-幔速度间断面的Ps转换波及其多次反射转换波信息,采用在地壳厚度-波速比平面上对接收函数转换波能量的叠加搜索方法,可以测定台站下方区域内地壳的平均厚度和泊松比.我们对渤海湾盆地北西盆山边界地区68个宽频带台站近两年的远震记录资料进行了处理研究,得到了该区域的地壳厚度以及泊松比分布.结果表明,渤海湾盆地北西盆山边界的泊松比值分布横向变化复杂,山区侧与盆地侧存在明显差异;山区侧泊松比值分布相对均匀,盆地侧变化剧烈,但存在小区域范围内(100~200km)的一致性,与地表出露岩石的对比表明:形成渤海湾盆地的新生代伸展作用在下地壳深度有明显的响应,从地震学上获得的泊松比分布对于了解该地区地壳物质组成可起到很好的约束作用.

 
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