松辽盆地北部布格重力异常场源分布

基于不同场源频谱成分的不同，研究松辽盆地北部布格重力异常的场源分布特征。利用匹配滤波方法计算松辽盆地北部布格重力异常的不同场源平均深度，将其分为浅源场、中源场和深源场，并推测松辽盆地北部的地壳有3层结构。浅源场产生的重力异常大，对重力勘探贡献最大；中源场和深源场的重力异常都比较小，但两者有极好的继承性。有了场源的平均深度，利用Parker迭代反演法计算上地壳与中地壳之间的界面起伏，在该界面上可看到松辽盆地北部的“隆起区-沉积盆地-隆起区”的构造特征。

The Bouguer Anomaly Field Source in North of Songliao Basin

Based on different characteristics of field source spectra power of the different field in north of Songliao Basin. In order source, we had studied the distribution to get the average depths of the different field source, bouguer gravity anomaly data from north of Songliao basin were calculated by the match-filter method. The bouguer anomaly can be divided into upper source field, middle source field, and lower source field, so we thought that there are three-layer crust structure in north of Songliao basin. The gravi- ty anomalies produced by upper source field are large and make the biggest contribution to gravity prospec- ting. The gravity anomalies of middle source field and lower source field are both small, but they have a wonderful inheritance. After getting the average depth of field source, we also calculated the average inter- face depth between upper crust and middle crust by using Parker iteration inversion method, found there is ＇upwelling area- sediment basin-upwelling area＇ tectonic characteristic at the density interface.