复电阻率测井的数值模拟研究  

Study on numeric simulation of complex resistivity logging

作　　者：肖占山[1] 徐世浙[1] 罗延钟[2] 朱世和[3] 张铁轩[3] 王东[3] 刘洋[3] 

机构地区：[1]浙江大学地球科学系 [2]中国地质大学 [3]辽河石油勘探局测井公司

出　　处：《石油地球物理勘探》2007年第3期343-347,共5页Oil Geophysical Prospecting

摘　　要：岩石的复电阻率频散特性与观测频率有着密切的关系。通过岩石频散特性的机理研究表明,低频时岩石的复电阻率频散特性与激发极化效应有关。针对双侧向电极系结构,对低频时的复电阻率测井进行数值模拟研究,发现井眼环境下的复电阻率测井的空间探测特性只取决于其电极系结构;井眼环境下获得的频率测井响应特性与岩石的复电阻率频散特性数值模拟实验所反映出来的规律相同。因此本文提出新的双频复电阻率测井的构想:电极系采用双侧向电极系结构;测井时分别提取低频和高频测井响应的复电阻率值及相角;再通过复数运算关系计算出同相电阻率和异相电阻率,进而用于有效地评价油气储层。There is close relationship between the dispersion character of complex resistivity and the observed frequency in rocks. It is shown by studying the mechanism of which the dispersion character of complex resistivity in rocks is relative to induced polarization in low frequencies. We carried out numeric simulation of complex resistivity in low frequencies for dual lateral electrode array and discovered the spatial surveying characters of complex resistivity logging in borehole environment only depend on the structure of electrode array; the frequency characters of logging response resulted from borehole environment are as same as the rule reflected by numeric simulation test of dispersion character of complex resistivity in rocks. Therefore, the paper presented conception about new dual-frequency complex resistivity logging: the dual lateral electrode array is used in electrode array; the complex resistivity values and phase angles of logging responses in low and high frequencies are picked up respectively in logging; the in-phase and out-of-phase resistivities are computed by complex operational relation, which are effectively used for evaluation of oil-gas reservoir.

关 键 词：复电阻率 测井 数值模拟 有限元频散 

分 类 号：P631.811[天文地球—地质矿产勘探]