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火山岩特有的岩石磁性特征为应用磁力资料预测火山岩提供了前提.磁力资料是寻找火成岩最有效的方法之一,火山岩具有较强的磁性,因而可以利用磁法资料特别是航磁资料来快速、宏观确定火成岩的分布.为利用区域磁异常可靠地预测盆地深层火山岩的分布,本文针对火山岩进行大量模型的磁异常正演(响应)分析,探讨了深层火山岩的磁异常特征.火山岩模型正演分析表明:火山岩磁异常随深度的增加,其异常幅值衰减较快,深层火山岩表现为较弱的磁异常,表现为叠加在强异常背景之上的弱异常,对利用区域磁异常识别深层火山岩带来困难.为突出和均衡深层火山岩磁异常,基于积分迭代延拓法,创新研发了“积分迭代延拓平化曲”磁异常处理方法,在深层火山岩预测中见到了明显的效果.应用斜导数、解析信号、垂向二阶导数、Theta图等多种处理手段对松辽盆地的深层火山岩进行了分布预测.研究结果表明:松辽盆地深层火山岩分布广泛,面积达114316km2,占盆地面积的43.8%,展示了松辽盆地深层火山岩气藏良好的勘探前景.
The unique magnetic characteristics of volcanic rock provide the precondition for the prediction of volcanic rocks by magnetic data.Magnetic data is one of the most effective methods to find igneous rocks.The volcanic rock has strong magnetism so that magnetic data, especially aeromagnetic data, can be used to quickly and macroscopically To determine the distribution of igneous rocks.In order to reliably predict the distribution of deep volcanic rocks in the basin by using regional magnetic anomalies, a large number of models are developed for the anomalous forward response of the volcanic rocks, and the magnetic anomalies of deep volcanic rocks are discussed. : The anomalous amplitude of volcanic anomaly decays rapidly with the increase of depth, and the deep volcanic rocks show weaker magnetic anomalies, showing the weak anomalies superimposed on the strong anomalous background. It is of great significance for the use of regional magnetic anomalies to identify deep volcanic rocks In order to emphasize and equalize the magnetic anomalies of deep volcanic rocks, based on the integral iterative continuation method, a new method of “integral iteration extension flattening song” magnetic anomaly processing has been developed, and obvious effects have been found in the prediction of deep volcanic rocks. Derivative, analytic signal, vertical second derivative, Theta diagram and other processing methods on the deep Songliao Basin Layer volcanic rocks.The results show that deep volcanic rocks in the Songliao Basin are widely distributed with an area of 114316 km2, accounting for 43.8% of the basin area, showing a good exploration prospect for the deep volcanic gas reservoirs in the Songliao Basin.