疏松砂岩油藏密闭取心含水饱和度校正方法  

CORRECTION METHODS FOR WATER SATURATION OBTAINED BY SEALED CORING FROM UNCONSOLIDATED SAND RESERVOIRS

作　　者：辛治国[1] 冯伟光[2] 郭士博[2] 李路晨[1] 孙志刚[2] 

机构地区：[1]中国石油大学地球科学学院,北京102249 [2]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《大庆石油地质与开发》2011年第1期58-62,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重大科技专项“大型浦气田及煤层气开发”子课题“高温高盐油藏精细三维地质建模及开发优化调控技术”（2008ZX05011-03）资助.

摘　　要：利用密闭取心井资料分析油、水饱和度是目前最直接有效的方法。但由于受岩心上提和钻井液侵入等过程影响，胜利油田主要含油层系馆陶组上段以及沙二段上部油层岩心测试油、水饱和度之和却只有75％-85％，需要通过校正求准饱和度数据。针对疏松砂岩油藏开展了挥发过程及岩心上提过程的室内实验，按照取心过程“逆流而上”分别进行了挥发校正、孔隙度变化校正、降压脱气校正以及钻井液侵入校正。校正结果显示。岩心上提过程导致油、水饱和度损失量最大，其中含水饱和度损失13．7％，含油饱和度损失6．5％。同时疏松砂岩油藏取心还需要考虑钻井液侵入对油、水饱和度的影响，对全侵和强侵样品进行了饱和度校正。Using the data from sealed coring wells is the most direct and effective way to analyze oil and water saturations currently. However, due to the influences of raising cores and invasion of drilling fluid, the oil and water saturations obtained by core testing from the main oil-bearing layer system （ the upper member of Guantao Formation and the upper part of Sha No. 2 Member） of Shengli Oilfield are only 75% -85%, therefore corrections are needed to get accurate saturations. Aiming at the development of unconsolidated sand reservoirs, the laboratory experiments on processes of volatilization and raising core are conducted, in which volatilization, porosity change, decompression and degasification, and drilling fluid invasion corrections are conducted respectively according to the coring process of ＂going upstream＂ The correction results show that the process of raising core leads to the largest loss of oil and water saturations with the water saturation loss of 13.7% and the oil saturation loss of 6.5%. Meanwhile, the influence of drilling fluid invasion on oil and water saturations should be considered during coring from unconsolidated sand reservoirs, and the oil and water saturations of completely and strongly invaded samples should be corrected.

关 键 词：密闭取心井 饱和度损失 挥发校正 降压脱气校正 钻井液侵入校正 

分 类 号：TE343[石油与天然气工程—油气田开发工程]