塔里木盆地西南部黄土塬地区地震采集技术

塔里木盆地西南部为昆仑山山前冲断带的一部分，地表黄土巨厚（大多为几十米至500m，局部超过600m），地形起伏剧烈，地下构造复杂，地震资料信噪比极低，油气地震勘探难度大。本文介绍了在该区开展地震采集技术试验的内容及成果：①应用高覆盖长排列宽线观测技术，增加目的层的有效覆盖次数，提高剖面质量；②应用大基距多井小药量优选速度层组合激发技术，增加地震波下传能量；③应用多检波器大组距组合接收技术，压制侧面干扰，提高资料的信噪比。总之，应用该套技术可显著改善地震资料品质。

Seismic acquisition in loess area,Southwestern Tarim Basin

Kunlun Mountains' foreland in Southwest Tarim Basin, China, iscovered with thick loess, whose thickness varies from dozens meters to even 600m.So S/N ratio of seismic data acquired in this area is very low due to serious energy absorption and strong secondary interference. On the other hand, compressed by Kunlun Mountains, the subsurface is very complex with developed faults. Based on our years' work, we summarize in the paper the following observations about seismic ac-quisition in loess area, Southwest Tarim Basin, mainly including: ① Wideline with long receiving spread is appropriate to increase the coverage of the targets, and improve data quality; ② Large source array with small charge size at each element under low velocity layer is suitable to preserve downgoing energy; ③ Large areal receiving array is effective to suppress lateral interference.