利用重磁资料预测呼伦湖地区油气资源量

Hulunhu-area hydrocarbon resource prediction using gravimetric and magnetic data

评估沉积凹陷的含油气性有两个重要参数，即生油岩所沉积的比例和生油岩中有机质向油气的转化温度。前者控制油气资源的生成；后者控制油气的生成及其以后的变化。利用重力资料可反演出各类沉积岩的厚度，利用航磁资料可反演出居里等温面，再由居里—外斯定律算出地温梯度。据此，即可算出生油门限温度范围内的沉积岩中生油岩的体积，预测油气资源量。

There are two important parameters for evaluating hydrocarbon resources in a sedimentary basin, namely, the proportion of source rock and the temperature at which organic substance in source rock changes into hydrocarbon. The former origi-nates hydrocarbon,and the latter controls hydrocarbon generation level and the con-sequent variation. Gravimetric data can be used to calculate the thicknesses of sedi-mentary formations, aeromagnetic data may be used to obtain Curie isothermal sur-face,and ground temperature gradient can be thus computed by using Curie-Weiss law. As a result,people can estimate source rock volume within the threshoId temper-ature of hydrocarbon generation,then predict hydrocarbon resources.