利用正则化方法计算重力归一化总梯度  

Calculating normalized full gradient of gravity anomalies using regularization method

作　　者：王选平[1] 张凤旭[1] 王彦国[1] 邰振华[1] 郭灿灿[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《世界地质》2014年第1期221-226,共6页World Geology

基　　金：中国地质调查局计划项目(1212011120973);国土资源部公益性行业科研专项(201311018)联合资助

摘　　要：针对重力归一化总梯度计算过程中向下延拓的不稳定性,将正则化因子引入到向下延拓中,提出了利用正则化方法计算重力归一化总梯度的方法。在模型试验中,对非均匀球冠模型中不同厚度油气藏进行试验分析,结果表明:选取合适的谐波数和正则化因子,可以较好识别出"两高夹一低"的储油特征,且识别能力强于常规的Fourier变换法,这说明本文方法能够提高重力归一化总梯度计算结果的稳定性和分辨率。在实例应用中,利用此方法不但清晰地显示了已有油气藏的位置,还推测了5个油气构造区。In order to solve the instability problem of downward continuation in calculating normalized full gradient of gravity anomalies,we take the regularization factor into downward continuation and propose a method of calculating normalized full gradient of gravity anomalies based on regularization method.In the modal test,we tested and analyzed oil-gas reservoir of the inhomogeneous sphere-coronal modal with different thickness.The result shows：with suitable harmonic wave number and the regularization factor,the characteristics of ＂one less value and between two high values＂ can be well identified,and the identified ability is better than with routine fourier transform.The fact indicates that the method can enhance the stability and the resolution of anomaly in calculation result.In application,the method not only showed the position of the known oil-gas reservoir,but also prospected five oil-gas areas.

关 键 词：重力归一化总梯度 正则化 向下延拓 油气 

分 类 号：P631.1[天文地球—地质矿产勘探]