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爆破地震勘探石油是一种重要的石油勘探方法,但受爆破参数、地质条件等影响.采用动力有限元软件ANSYS/LS-DYNA,研究了柱状、球状两种装药形状和爆炸当量等激发因素对碳酸盐岩岩石中爆炸应力波场特性和爆炸地震波能量衰减规律的影响,得到了爆炸参量对岩石应力、振动速度等的影响规律,并与爆破地震效应经验计算公式进行了对比分析.结果表明相同药量下球状装药爆炸时岩体中应力波强度较大,作用时间较长,而且药量增大时,装药形状的影响越来越明显;柱状、球状装药药量分别达到20kg、50kg时,能产生较好的爆破勘探激发能量和效费比.该结论可为优选适合西南地区碳酸盐地层地震勘探的激发因素提供技术途径和方法.图3,表5,参10.
Blasting seismic exploration oil is an important oil exploration method, but it is affected by blasting parameters, geological conditions, etc. The dynamic finite element software ANSYS / LS-DYNA is used to study the influence of the columnar and spherical charge shapes and explosive equivalence The influence of explosion parameters on the rock stress and vibration velocity was obtained by analyzing the characteristics of the wavefield of explosion stress in carbonate rock and the attenuation law of the energy of the explosion seismic wave and the contrastive analysis of blasting seismic effect empirical formula was made.Results It is shown that the intensity of stress wave in the rock mass is larger and the action time is longer when the spherical charge explodes with the same dose, and the influence of the shape of the charge is more and more obvious when the dose is increased. The columnar and spherical charges reach 20kg, 50kg, it can produce better energy and cost-effective ratio of blasting exploration.The conclusion can provide technical methods and methods for optimizing the excitation factors of seismic exploration in carbonate strata in Southwest China Fig.3, Table 5, Reference 10 .