成像测井技术在储层改造评估中的应用

塔里木油田碳酸盐岩储层深度达5 000~7 000 m,为了避免下套管固井造成的井下复杂问题并节约成本,一部分井采用长井段裸眼完井的方式进行改造。长井段裸眼完井由于井段长,改造后仅靠酸压效果和软件模拟进行评估具有很大的盲目性。通过储层改造前后井底裸眼段成像测井资料的对比,可以得出裂缝起裂位置和近井筒处的缝高,明确改造过程中对哪段储层进行了针对性改造。将成像测井图像对比得出的结论与产液剖面测试结果、压后产能流体资料进行了对比,结果显示三者具有良好的一致性。储层改造前后成像测井图像对比为储层改造评估提供了新的技术手段,为优化储层改造方案提供了直观依据。

Imgaing logging used in valuation of reservoir stimulation

The depth of carbonatite reservoir in Tarim Oilfield is up to 5 000~7 000 m. In order to prevent downhole troubles caused by running casing in cementing and to save costs, some wells were stimulated by way of long interval openhole completion. Due to long interval in long interval openhole completion, the assessment only by acid fracturing and software simulation after stimulation is of great blindness. By comparing the imaging log of bottom openhole interval before and after reservoir stimulation, the initiation location of fractures and the fracture height near the wellbore could be found, and it was clear which section of reservoir was stimulated. The conclusion from comparing the images of imaging logging was correlated with the result of produced fluid profile testing and the fluid data of productivity after fracturing. The result shows that these three are very well consistent. The correlation of images from imaging logging before and after reservoir stimulation provides a new technique for evaluation of reservoir stimulation and provides a visual basis for the program of reservoir stimulation optimization.