利用直线型四探针法刻度微电阻率成像测井电阻率

The application of linear four-probe method to calibrating resistivity of micro-resistivity image logging

微电阻率成像测井方法在储层评价及沉积相、沉积、构造研究方面具有重要价值,但是其测量值未经过专门刻度,而目前利用浅侧向测井和球型聚焦测井对其刻度的方法仍不精确。笔者阐述了直线型四探针法的基本原理,并利用ST2258C型四探针测试仪器,验证了直线型四探针法测量岩样电阻率的有效性,进而提出了一种电成像测井电阻率刻度流程。

Micro-resistivity imaging logging plays an important role in the reservoir evaluation and the study of sedimentary facies and structures. However,its measurement values are not calibrated exclusively. Besides,the utilization of shallow lateral well logging（ LLS） or spherical focusing logging（ SFL） data to calibrate micro-resistivity imaging logging values is not accurate enough. This paper introduces a basic principle of Linear Four-Probe and uses four-probe device（ ST2258C） to prove its validity. Moreover,it presents a workflow to calibrate the resistivity of imaging logging.