民和盆地黄土塬区地震采集技术

Seismic acquisition technique in loess plateau of Minhe basin.

民和盆地地形起伏剧烈,地表岩性纵、横向变化大,黄土覆盖层和下伏老地层之间形成较强的波阻抗界面,地震波激发、接收条件存在严重的非一致性问题,面波、浅层折射、侧面波、散射等干扰波发育,能量强、衰减慢,导致以往原始单炮记录信噪比极低。通过多信息折直测线布设、优化激发因素、高密度地震采集、精细表层调查和静校正等多种方法的综合应用,见到了良好的效果,对盆地的构造格局与资源潜力有了新的认识。

The Minhe basin is characterized by strong fluctuation of geography and large variation of near-surface lithology both in vertical and lateral directions,forming strong wave impedance interface between the loess cover coat and the underlying old layers,resulted in seriously non-consistent issue for shooting and receiving condition of seismic waves,developing such interference waves as plane wave,shallow refractions,sidewipe and scattering characterized by strong energy and slow attenuation,all these resulte...