摘要
本文概述了四种油水饱和度分析方法,及不同方法对岩心中已知水的蒸发率和萃取率,研究了不同油水饱和度分析方法的适用范围与优缺点,探讨了提高油水饱和度分析准确度的措施。同时对油水饱和度分析中超百的因素进行了分析。提出了一种适合不同岩性油水饱和度分析的新方法。认为,储层油水饱和度超百与岩心中粘土矿物的成分、含量、岩性、孔隙度分析方法以及分析中的操作条件有关。对于致密含油砂岩样品,应模拟地层压力测其孔隙度;含泥质多的岩心,应在低温条件下除油恒湿测定孔隙度。对于油包水类型的含油砂岩,采用色谱法分析时,应添加油溶型破乳剂进行破乳。
This paper gives a brief description of four techniques used in oil and water saturation determination and their corresponding flow diagrams are given also.The rate of evaporation and extraction of the water in the test- ed core samples are demonstrated.Advantages and disadvantages of each techniques and their applicability for different types of core samples are stu- died,so that correct measures for increasing the accuracy of saturation ana- lysis are suggested.Factors affecting the saturation analysis of the cores from different regions in northern part of Songliao basin are analyzed,where the some of oil and water saturations in some core samples is greater than 100%(over-hundred);and a new technique applicable to core samples with different lithology is suggested. This paper recognizes that the“over-hundred”saturation in a core is re- lated to the composition of the clay minerals and their contents,lithology, method of porosity determination as well as procedures used in the satura- tion analysis.For a tight sandstone core(porosity<8%,permeability<0.1× 10^(-3)μm^2),the porosity should be determined under actual confining pressure of the reservoir;In the case of a core samples with high clay content the oil should be cleaned under relatively low temperature and the porosity sh- ould be determined under constant humudity;When chromatographic meth- od is used in saturation determination,oil soluble emulsion breaker should be added.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期69-78,共10页
Petroleum Exploration and Development
