井间电磁成像技术中磁场振幅和相位的响应函数分析

Detecting Sensitivity and Response Functions Analysis of Crosswell Electromagnetic Tomography

井间电磁成像技术是监测和描述开采期间油储层动态变化的重要手段之一,它可为分析井间剩余油分布,提高油田滚动勘探和开发中打高效调整井提供重要依据.井间电磁成像的探测灵敏度与响应函数分析是其仪器设计、测量条件选择和资料处理方法研究的重要基础和依据.已有的理论推导和数值考察分析是针对测量磁场的实部和虚部进行的,而研究表明实际测量宜选用磁场的振幅和相位作为测量量.为便于直接与实测资料相对应,本文定义和推导了磁场的振幅和相位的响应函数公式,利用它们对振幅和相位的探测灵敏度与空间分辨率做了数值考察和分析.

An important problem in petroleum production was the development of a reservoir model which guided the drilling of wells and the management of the field. The surveys of low-frequency cmsswell EM had adequate power to monitor the deposits of oil and natural gas with the transmitters in transmitting well and receivers in another wells around up to several hundreds meters apart. It had a longer range of detection and get more information of deposits than the one well logging. We examined the Frechet derivatives introduced in B. R. Spies and T. M. Habashy＇ s paper （1995） ,for practice we chosed the amplitude and the phase as the examining components in our paper and examined their sensitivity functions with the conductivity. The results shown here indicated that the new sensitivity functions acted better than with the Frechet derivatives.