川东北地区山地三维高分辨率地震采集技术

针对川东北地区复杂的地表条件进行了大量的采集方法试验和研究,总结出一套适合该区山地地表三维高分辨率地震采集的技术和方法:①采用大排列片、宽方位三维观测系统获得了更多方位的射线资料;②合理选择激发井深和药量,做好野外激发的阻抗耦合和几何耦合工作,确保整个工区激发能量和频率的一致性;③根据地层吸收和衰减规律,合理选择检波器埋置耦合方式,提高记录的分辨率和信噪比;④利用高精度数字卫星地图进行地面物理点设计,保证实测点位精度和观测系统属性的一致性。上述方法使该区地震资料品质明显改善。

The 3D High Resolution Seismic Acquisition in the Northeast mountainous in Si Chuan Province

A set of 3D high-resolution seismic acquisition techniques, that is suitable to the complex mountain surface condition in the northeast of Si Chuan Province, was found out after a great deal of tests and studies were made. The 3D layout with large array area and width azimuth acquired ray data from more azimuth; The adequate shooting depth, charge size were chosen and good impedance coupling, geometric couple in field insured the consistency of shooting energy and frequency in whole area; The adequate setting mode of geophone improved the resolution and signal-noise ratio according to the rules of formation and attenuation ; By using high precision digital satellite maps, the designed surface physical points ensured the surveyed point precision consistent with the layout attributes.