C/O测井地层探测深度的理论研究

A Theoretical Study on the Formation Investigation Depth of C/O Logging.

郑华，丁有贵．Ｃ／Ｏ测井地层探测深度的理论研究．测井技术，１９９９，２３（１）：３～５通过蒙特卡罗模拟，研究在１４０ｍｍ套管井中８９ｍｍ外径Ｃ／Ｏ测井仪的响应随油层径向厚度不同的变化关系，得到不同源距处的地层探测深度。理论结果显示，地层探测深度随源距的增大几乎呈线性增加，双源距Ｃ／Ｏ测井仪中２个探测器的地层探测深度有显著差别。

Relation between the responses of a 31/2 in diameter C/O logging tool in a 51/2 in cased borehole and the radial thickness of 35% porosity oil sand are studied with Monte Carlo simulations, and the formation investigation depths of different spacings ranging from 12 5 to 67 5 cm are obtained. The results calculated show that the investigation depth almost increases linearly with the increase of the spacing. The investigation depths of the two detectors in a dual spacing C/O logging tool are significantly different.