中国东北地区重力场研究——剩余重力场与重点油气勘探盆地的关系及油气勘探新领域

Study of gravity field in Northeastern China area:The relationship between residual gravity field and major exploratory basins，and new areas of oil-gas exploration

本文利用基于余弦变换的匹配滤波技术对中国东北地区布格重力异常进行了分离.根据分离的剩余场异常特征,以黑河—齐齐哈尔—白城断裂带和佳木斯伊通断裂带为分界线,把东北地区分布的主要盆地划分为西部盆地、中部盆地和东部盆地.指出研究区主要盆地的构造样式与剩余场相关的正负异常圈闭呈现一一对应的关系,其地质边界范围与剩余场反应的边界范围大体相同,这充分说明利用本文分离的剩余场所体现的其他负异常圈闭进行油气勘探新领域的研究和预测是合理的.在此基础上,划分出当前勘探程度较低的5个有利于油气勘探的负异常圈闭区.

The paper separates gravity anomalies in Northeastern China area by using the technique of matched filtering based on cosine transform, in order to study the relation between the negative anomalies of residual gravity field with the distribution of major exploratory basins. According to the characteristics of residual gravity field separated, the main basins in the Northeastern region are divided into western basins, central basins and the eastern basins. The Heihe Qiqihar Baicheng fault and Jiamusi-Yitong fault zone are the crucial boundary lines. At the same time, we point out there is one to one relationship between the structral styles of the main basins and the positive and negative reaidual anomlies traps, for example Mohe basin, Genhe basin, Labudalin basin, Hailar basin, Songliao Basin, Hulin basin, et al, in which the boundaries reflected by the geology are nearly the same as by the remaining field. It is shown that to research and forecast new area of oil-gas exploration are reasionable using the other negative anomalies traps in the residual field separated by the paper. On this basis, 5 areas of negative anomalies traps that respectively are Qingyang, Huanan, Dunhua-Mishan, Hunchun and Meihe are marked off for oil-gas exploration where the current degree of prospection is lower.