自然伽马测井在油田开发中的应用

Application Study of the Natural Gamma Logging in Oilfield Development

徐保庆 伍泰荣 田树全

胜利油田有限公司临盘采油厂

Shengli Oilfield Co. Ltd. , SINOPEC, Shandong 251507 , P. R. China

自然伽马测井是套管井测井中一种最基本的方法。它以地层自然放射性为基础,测井时用伽马射线探测器沿井眼进行测量。地层中的自然伽马放射性不是一成不变的。随着油田开发的进行,放射性物质不断被搬运、堆积,使油井水淹层、注水井的注水层位、套管外串槽等处呈现放射性异常。通过介绍临盘采油厂自然伽马测井曲线在油井水淹层评价、判定注水井的吸水情况、油水井管外串及辅助解释注水井的大孔道等方面的应用情况,证明了自然伽马测井曲线的新用法切实可行。

Natural gamma logging is a kind of most basic methods of well logging in cased wells which measure with gamma ray detector along well during logging. As the natural gamma radioactivity in the stratum is not unalterable ,and with the development of the oilfield , radioactive material is also carried ,piled up constantly , so the unusual phenomenon of radioactivity appears in water-flooded zones ,water injection layers in water injected well ,leakage out of cased holes etc. Through application of natural gamma logging in Linpan Oilfield , such as in evaluating water-flooded layers , judging absorption of water-injected-well , in understanding leakage out of cased hole of the oil and water well and in explaining large narrow passage section ,it is proved this natural gamma logging is feasible.