多相介质油田白垩的试验研究

为了合理解释北海白垩油田遭遇的钻井失稳及地表沉降等问题，深入了解油田白垩的特殊性态。在试验研究的基础上对多相介质油田白垩的非饱和特性进行了研究。试验结果证实了非饱和白垩具有与一般非饱和土相似的生态，包括水饱和度与虹吸力的关系，适用于非饱和白垩的应力状态变量，具有强度和压缩性随吸力的变化而变化的特性等，所获成果可为油田白垩的模型研究提供参考依据，并对解决在石油开采过程所遇到的工程问题具有指导意义。

Experimental Study on Multiphase Chalk in Petroleum Reservoir

In order to explain the problems of well instability and surface subsidence occurring in the North Sea petroleum reservoirs,and to better understand the behavior of the chalks,we verified its unsaturated properties by the way of experimental research.The multiphase petroleum chalk is proved to have some characters similar to general unsaturated soils,such as the relationship between water saturation and capillary force,the stress state variables suitable for study on unsaturated chalks,and the change of the strength and compressibility with the suction.These results can have reference to establishment of model for chalks,and be instructive for solving the problems during exploiting in the reservoir fields.