摘要
储层含油层段与非含油层段的电阻率、极化率等电性差异一般较大,时频电磁勘探通过大功率人工场源激发电磁场,直接探测油气藏引起的电阻率和极化率异常,达到检测和评价含油气有利目标的目的。通过在T盆地不同阶段不同油气目标的应用分析,发现不同类型油气藏具有不同的极化异常特征。该技术在T盆地的有利目标预测结果已被多口井验证,与实钻吻合率达68%以上。文中还总结了时频电磁勘探方法的适应性与局限性。
The differences in resistivity and polarization between oil-bearing traps and non oil-bearing traps are very obvious. Using high-power artificial source to excite electromagnetic field,time-frequency electromagnetic(TFEM)detects the resistivity and polarization anomalies caused by reser-voirs,and then detects and evaluates favorable hydrocarbon targets.Through applications on different stages of oil and gas exploration in T Basin,different types of reservoirs are found with different polarization anomaly characteristics. More than 68% of our prediction results by this approach in T Basin are proved as being consistent with latter drilling data.This article summarizes also the adaptability and limitation of TFEM.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2014年第A01期228-232,10,共5页
Oil Geophysical Prospecting
关键词
时频电磁
极化率
时间常数
频率相关系数
油气预测
time-frequency electromagnetic(TFEM)
polarization
time constant
frequency-dependant coefficient
oil and gas prediction
