【摘要】 航磁异常与油气藏之间有着密切的关系 ,烃类向上逸散及局部构造在磁异常中都有不同程度的表现 ,由此可以建立航磁异常与烃类分布关系的理论模式。文中探讨了 3种提取与油气相关异常的方法 ,即用剖面上延剩余法提取与烃类相关的高频微磁异常及与局部构造有关的中频局部异常 ;用归一化总梯度法确定油气上方场源位置 ;用线积分法圈定油气田范围等 ,并结合实例对以上方法的应用效果进行了分析更多还原

【Abstract】 There is a close relationship between areomagnetic anomalies and hydrocarbon accumlations,because upward diffusion of hydrocarbon and local structures may be expressed in magnetic anomalies with various intensity.Thus,a theoretic model can be established for the relationship between aeromagnetic anomaly and hydrocarbon distribution.Three methods are discussed to identify anomalies related to hydrocarbon accumulations:(1)Upward continuation method of residual magnetic anomaly along profile section which can extract high frequency micromagnetic anomalies related to hydrocarbon and middle frequency magnetic anomalies related to local structures; (2)Normalized total gradient method,which can be used to determine location of magnetic field source above hydrocarbon accumulations; (3)Line integral method,which is useful to mapping areas of oil and gas fields.In combination with several application cases,the actual effects of these methods are analyzed.更多还原