双感应测井幅度差及“双轨”分析  

Analysis on amplitude difference and dual-track in dual induction logging

作　　者：胡春桥[1,2] 谢伟彪[3] 殷秋丽[3] 刘迪仁[1,2] 

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学) [2]长江大学地球物理与石油资源学院 [3]冀东油田勘探开发研究院

出　　处：《石油仪器》2014年第5期45-48,51,共5页Petroleum Instruments

基　　金：国家973计划项目"地球物理场的信息融合模型"(2007CB209607);国家自然科学基金(41474116)项目资助

摘　　要：在渗透性层段,双感应测井往往会产生幅度差,一般可以利用幅度差来直观地判断地层特性。在非渗透性层段,双感应测井有时候也会产生幅度差,也就是"双轨"现象。一般认为在泥岩或者其他非渗透性层段出现这种幅度差是非正常现象。通过二维模式匹配法正演数值计算,分析了双感应测井幅度差的主要影响因素。经分析认为泥浆侵入、井眼、围岩等因素都会对双感应测井幅度差产生影响,并由此说明了双感应测井不仅在渗透性层段会产生幅度差,在非渗透性层段也会产生幅度差,即"双轨"现象。这些结果及其依据可为双感应测井的资料应用提供一定的参考。In the permeable formation,dual induction logging results in amplitude difference,which is applied to estimate formation features. While in the impermeable formation,sometimes,amplitude difference can also be caused in dual induction logging,which is known as dual-track. It is generally considered that it's abnormal of the amplitude difference emerging in mudstone or other impermeable formations. Based on the 2D numerical mode-matching( NMM) method,the main influencing factors of amplitude difference in dual induction logging are analyzed through the numerical simulation in this paper.And it is found that mud invasion,borehole,shoulder bed and other factors can affect the amplitude difference. Therefore,it is proved that not only in permeable formation but also in impermeable formation can dual induction logging cause amplitude difference. These results can be referenced to the application of dual induction logging data.

关 键 词：双感应测井 幅度差 双轨 数值模式匹配 

分 类 号：P631.81[天文地球—地质矿产勘探]