松辽盆地松北新区地震采集方法研究

A Study of Seismic Acquisition Technique Used in New Region of Songbei in Songliao Basin

以海伦及嫩江区块为试验区,开展松辽盆地冻土区二维地震勘探方法研究。多种激发和接收因素的对比分析,发现不同地表岩性6kg、8kg药量激发在1.2s、2.2s附近反射波同相轴连续性较好,反射信息丰富。从监控剖面看,覆盖次数均匀,资料缺口较小,小号段属于低丘陵地带,浅层能量强,波组连续性好,目的层较浅,中层反射较弱。中号段和大号段中深层均可见反射同相轴,连续可追踪,信噪比较高。

Taking Helen and Nunkiang sections as test sites, a study of 2D--seismic exploration technique used in freeze soil region in Songliao Basin is conducteck Contrastive analysis of various factors of shot and receiving has found out that the shot using 6kg or 8kg explosive quantity at different surface lithology presents better contiuity of reflectin events and abundant reflection information near 1,2s and 2. 2s. Monitoring section shows that the folds are well--distributed and information gap is smaller. Small--number section belongs to low hilly land where energy of shallow is strong, contiuity of wave group is fine, target layer is shallow and middle--level echo is weak. Mean- while, at semi--deep section of middle--number and large--number sections, there are continuous and traceable re- flection events which have a high signal--noise ratio.