摘要
D指数也称地层可钻性指数 (无量钢 )。在正常地层压力梯度下 ,随着地层埋藏深度的增加 ,地层可钻性变小 ,但在钻遇泥岩超压层时 ,地层可钻性出现了异常变化 ,利用这一特征 ,D指数可用于钻井过程中泥岩超压层的预测。当泥岩裂缝发育时 ,这种地层同样表现出相对压力高和可钻性的特点。因此 ,在完井后经过对D指数资料的重新回放处理 ,并结合气测异常显示 ,可以按裂缝的发育程度对裂缝型储层进行小层细分 ,这对于优选试油井段。
D index is also called formation drillability index (dimensionless). In normal formation pressure gradient, with the increase of formation burial depth, formation drillability decreases. However, formation drillability may change abnormally when shale super pressured formation is drilled. Using this characteristic, D index can be used in the prediction of shale super pressure formation in the process of drilling. When shale fractures develop, they also appear as relative high pressure and drillability. Therefore, through a re playback processing of D index data after completion, and combining with gas testing abnormality appearance, fractured reservoirs can be subdivided according to the development of the fractures.
出处
《大庆石油地质与开发》
CAS
CSCD
2001年第5期15-16,共2页
Petroleum Geology & Oilfield Development in Daqing
