摘要
为了提高海拉尔盆地野外采集资料的品质,针对具体影响因素,对表层结构调查、激发、接收及观测系统设计等环节进行了改进和完善。表层结构调查以微测井为主,对微测井资料除了进行基于运动学特征的常规解释外,还运用了初至波的振幅、频率等波动力学信息进行岩性细分,提高了表层岩性划分的精度;激发采用小药量多井组合方式,组合基距不大于20m,激发井深根据微测井成果与生产中的井深实验资料逐点设计;采用多检波器组合方式接收,检波器频率为28Hz和35 Hz,组合基距为22.5m;观测系统采用斜交观测系统,20m×20m面元,6×10次覆盖,最大炮检距为2 961 m,1 680道接收。将上述措施应用于实际工区,在野外采集的单炮记录上,从浅层到基底反射齐全,连续性好,信噪比较高;新剖面比以前采集的剖面在信噪比和分辨率上都有较大的改善。
Great effort has been made on near surface investigation, selection of shooting and receiving parameters, and layout design to enhance the quality of data acquired in Hailaer Basin. Micro log was used as the main means of near surface investigation. Besides kinematics-based interpretation, lithological classification was implemented on the micro log data in terms of kinetic parameters such as amplitude and frequency of the first arrival. Small dose and hole array was adopted in shooting. The array length was no more than 20m. Shot depth was pointwise determined from the micro log data and existing hole depth data. Geophone array with array length of 22. 5m was used in receiving. The geophones used have a frequency of 28Hz or 35Hz. Oblique crossing layout with a bin of 20 m×20 m was used. The coverage was 6×10. Maximum offset was 2961m, receiving with 1680 traces. Compared with the legacy data, the new data are superior in signal-to-noise ratio and resolution.
出处
《石油物探》
EI
CSCD
2004年第4期395-399,7,共5页
Geophysical Prospecting For Petroleum
