摘要
在高温(80℃)、高压(15MPa)条件和常温常压条件下,分别测定岩石的地层因素和饱和度指数,进行对比实验。实验结果表明:地层因素对温度不敏感而对净上覆压力较敏感,高压条件下地层因素高于常压条件;饱和度指数对温度敏感性较弱,对有效应力敏感,含水饱和度高时电阻增大率接近,含水饱和度低时高压条件下的电阻增大率低于常压条件。与地面条件相比,地层条件下测得的岩性系数a增大,胶结指数m、饱和度指数n和岩性系数b减小。用地层条件下测得的特征参数计算的含水饱和度比地面条件下小。应该在模拟油藏实际有效应力条件下测定岩石电性参数。
The formation factor and the saturation index are measured and compared under both high temperature (80℃)/high pressure (15MPa) and normal temperature/pressure conditions. The results show that the formation factor is not sensitive to the temperature but to the net overburden pressure. The formation factor under high pressure is will have much effece than that under normal pressure. The saturation index is slightly sensitive to the temperature and sensitive to effective stress. The resistivity increment rate under both the above conditions varies slightly when the water saturation is higher. When the water saturation is low, the resistivity increment rate under high pressure is lower than that under low pressure. Compared to the surface conditions, the lithological coefficient a measured under formation conditions becomes larger, while the cementation index m, saturation index n and lithological coefficient b change to smaller. The water saturation calculated using the characteristic parameters measured under formation conditions is smaller than that under the surface conditions. The rock's resistivity parameters should be measured under the conditions wherein the actual effective stress of the simulated reservoir.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2004年第1期113-115,共3页
Petroleum Exploration and Development
关键词
地层条件
岩石电性特征
地层因素
温度
含水饱和度
电阻率指数
formation condition
rock resistivity
formation factor
temperature
water saturation
resistivity index
