组合波频域电磁测深在油气勘探中的应用  

Application of frequency-domain combinative electromagnetic wave sounding to hydrocarbon exploration

作　　者：苏发[1] 何继善[2] 

机构地区：[1]西安交通大学电子与信息工程学院,710049 [2]中南工业大学

出　　处：《石油地球物理勘探》1996年第2期232-237,共6页Oil Geophysical Prospecting

摘　　要：组合波频域电磁测深是依据一种含有多种同福、不等频的交变组合电磁波进行地球物理探测的方法。该电磁波中的每一频率成分都将和地下介质发生于相互作用，从而激发出对应不同频率的电磁响应所形成的一个复合场。每一频率万分的场都含有相应的背景场和地电异常场，于是可以利用双频组合于两种频率成分的同幅、不同频的性质，提取场量的某种频差值来消除背景场的影响，以达或突出地电异常的目的：本文以层状大地为模型，水平大回线为场源，通过引入组会波理论，提出了一套进行组合波频城电磁测深的理论和方法，并探讨了其在油气勘探中的应用前景。该方法具有压制干扰、突出地电异常、探测深度大、覆盖面广、灵活方便的特点，是寻找油气构造的一种有发展前途的电磁方法。Frequency-domain combinative electromagnetic wave sounding is a geophyslcal sounding method using alternating combinative electromagnetic waves which have same arnplitude but different frequencles. The different frequency comtents interact resPectiveIy subsurface medium to produce their own electronlagnetic responses,which form compound electromagnetic field. The component field of each electro-magnetic wave has its own background field and geoelectric anomaly field. Thus we can reruove background field influence to highlight geoelectric anomaly by using the frequencyr difference derived from the fact that two kinds of frequency contents in dual-frequcncy compound field have the same amplitude but different frequencies.On the basts of layered earth model. horizontal big circuit field-source and combina-tive wave theory, we developed the principle and method for frequency-domain cofnbinative electromagnetic wave sounding - and analysed its potentlal application in hydrocarbon exploration. The method is charecterized by good noise suppres-sion, highlighted geoelectric anomaly - big sounding depth - wide coverage and con venient use; therefore it will be useful electromagnetic method in discovering the structure where hydrocarbon accuruulates.

关 键 词：油气勘探 组合波 电磁法勘探 

分 类 号：P618.130.8[天文地球—矿床学] P631.325[天文地球—地质学]