【摘要】 在复杂地表和复杂构造地区,激发与接收条件差,目的层反射能量不匀,导致采集的地震数据信噪比低。针对这个问题,提出了非规则观测系统设计思路,即基于地震波照明模拟结果,采用局部加密炮点、规则布置接收排列的方式。方法原理是:通过正常炮距的数值模拟结果,确定照明能量最小位置,进行局部炮点加密,求得目的层照明能量均匀性最高的炮点组合。以塔里木盆地某逆掩推覆构造二维模型和南海白云凹陷崎岖海底模型为例,验证了方法的有效性和实用性。模型试验结果表明,在二维情况下,该方法的应用效果很好,照明能量分布均匀;在三维情况下,加密炮的效果要弱于二维情况,但照明能量分布的均匀性得到了很大改善。更多还原

【Abstract】 At the areas with complex surface conditions and structures, the poor shooting & receiving conditions and uneven reflection energy leads to the low S/N of acquired seismic data.We put forward to a solution for designing irregular geometry,which is based on the illumination simulation of seismic wave,locally densify shot points and regularly fixes up receiving arrangements.The principles of the method are as follows:the position of minimum illumination energy is identified by the normal shot space simulation results,to locally densify shot points and obtain the shot point array of target intervals with highest uniform illumination energy.Taking the 2-D model of overthrust nappe structure in Tarim Basin and the rough submarine model of Baiyun Depression in South China Sea as examples, we discussed the validity and usefulness of the method.Model test results show that in 2-D situation,the method is effective,and the illumination energy has uniform distribution;in 3-D situation,the effect of densifying shot points is weaker than that of 2-D situation,but the uniformity of illumination energy has been largely improved.更多还原