黄土塬地区地震勘探采集技术

Seismic acquisition in loess yuan areas

1. 西安交通大学建立学院,西安710049;2. 胜利石油管理局物探公司工艺研究所,东营257100

Geophysical Exploration and Development Corporation Of ShengLi Oil Field, Dongying 257100

黄土塬地区黄土厚度达400m,由于3个特殊界面的存在,导致多次波发育。该地区地震采集的难点是表层吸收衰减极为严重,地震波的激发是一项关键的技术。由于所获得的地震资料信噪比低,野外压制噪音是该区地震勘探的一个重要环节。我们采用5井组合,单井小药量2kg,在虚反射界面下1～2m处激发,20m组合基距接收的工作方法,取得了较好的效果

The thickness of loess in loess yuan is about 400m.Data acquired in this area are rich in multiples because there are 3 specific interfaces. Absorption attenuation from surface layers gives a great challenge to seismic acquisition. The key to meet the challenge is excitation of seismic waves. In addition, noise suppression in acquisition is also important to acquired data with desired S/N ratio. Our array has 5 holes with explosive load of 5kg in each hole. Seismic waves are excited 1～2m below ghost reflection interface with grouping length of 20m. Desirable results were reached.