中心回线瞬变电磁测深法在表层结构调查中的应用  

Application of Central-loop Transient Electromagnetic Method (TEM) for Investigating Shallow Geologic Structure

作　　者：黄俊明 苏朱刘[2] 吴信全 曾军[4] 宫建清[4] 

机构地区：[1]东方地球物理公司西部勘探事业部,新疆乌鲁木齐830016 [2]长江大学地球物理与石油资源学院 [3]新疆正通诚信科技有限公司,新疆乌鲁木齐830016 [4]新疆油田分公司,新疆克拉玛依834000

出　　处：《江汉石油学院学报》2004年第3期63-66,共4页Journal of Jianghan Petroleum Institute

基　　金：国家自然科学基金项目(40174040)。

摘　　要：在准噶尔盆地腹部应用中心回线瞬变电磁测深法进行了沙漠地带表层结构调查的试验。采用“虚拟全区视电阻率”参数和一维“正演修正法”对实测数据进行反演成象,能直观地反映地下一维电性层电性垂向变化特征。同时,提出了在少量微测井控制下,由电阻率剖面转换地震波速度剖面的非线性高阶多项式拟合算法。结果表明,该方法可以精细描述10-300m深度范围内的地层电性变化特征,电性界面与微测井地震波速度界面有较好的一致性,说明该方法为地震资料静校正提供表层结构信息是可行的。A test for desert shallow geologic structural investigation is conducted on the control area of Jungar Basin by using central-loop TEM. The parameters of pseudo-all-time apparent resistivity and 1 dimensional forward modifying method are used for inversing and mapping the measured data, by which the property of vertical variations of 1 dimensional conductive layer can be reflected visually. A non-linear higher order polynomial fitting method is also proposed to transform the resistivity profile into seismic velocity profile under the control of a micro-well logging velocities. The result shows that the method can be used to accurately characterize the conductivity variation properties in formation from 10m to 300m. The conductive interface is consistent with that of seismic velocity of micro-well logging, which indicates that the shallow geologic structural information provided with method for seismic data static calibration is feasible.

关 键 词：瞬变电磁测深 全区视电阻率 正演修正法反演 地震静校正 浅层结构调查 

分 类 号：P631.325[天文地球—地质矿产勘探]