新型油基泥浆测井电成像方法研究

A novel approach for borehole electrical imaging in oil-based mud

电成像测井能够直观地获取岩性、沉积以及裂缝等地质信息,在油田勘探开发中得到日益广泛应用.在油基泥浆环境中,电成像装置采用电容耦合原理把交变电流发射到地层中,测量各个钮扣电极的电流或者电位,可以得到钮扣的阻抗,把阻抗信号进行标定,获得反映地层特征的图像.本文提出了一种新成像处理方法,把测量的复数信号经过数据处理,不但能够获取地层电阻率图像,同时也能够获取地层的介电常教图像.运用该方法对地层模型进行了验证,与此同时对试验井测量资料进行成像处理,获得了清晰的电阻率图像和介电常数图像.

The lithology, sedimentary structure, fractures and other geological information can be acquired directly from the electrical imaging log that widely applied in oilfield development. In oil-based mud environments, electrical imaging tool injecting alternating current into the formation using capacitive coupling, the button impendence can be obtained by measuring each button electrode current or potential, and the image that reflecting the formation characteristics can be acquired through calibrating the impendence signal. This paper proposes a new imaging processing method, the complex signals measurement after data processing, not only can obtain the formation resistivity image, dielectric image also can be obtained. The method has been validated by the modeling, at the same time the test well data by imaging processing can obtain well defined resistivity image and dielectric image.