扩散系数实验技术研究.pdf

2012年8月
大庆石油地质与开发
第31卷第4期
Petroleum Geology and Oilfield Development in Daqing
Vol 31 No 4
DOI:10.3969/J.ISSN.1000-3754.2012.04.010
扩散系数实验技术研究
曲秀英
(大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712)
摘要;在应用以费克(FICK)第二定律为理论依据的扩散系数计算方法及自行设计的岩石扩散系数检测设备技
术的基础上,进行了重复性及不同条件下对扩散系数的影响实验,探讨了温度、压力等因素影响扩散作用的机
理。认为在扩散系数检测过程中,应釆取恒定的温度、闱压与初始测试气体压力オ能避免由于不同条件变化给
扩散系数测试带来的影响。通过试验区含气丰度不同的气臧盖层样品扩散系数与渗透率实验研究,盖层扩散系
数小于10-cm3/s的区城在该地区能够形成有效封盖,大于10-eam3/s的区域难形成有效盖层,而且随扩散系数
减小对油气封闭保存更有利。
关键词:扩散系数;实验方法;地质作用
中图分类号:TE122
文献标识码:A
文章编号:1000-3754(2012)04004604
STUDIES ON THE EXPERIMENTAL TECHNIQUE OF
DIFFUSION COEFFICIENT
QU Xiuying
Exploration and Deelopment Research Institute of Daqing i ield Company Ltd. Daging 163712, China
Abstract On the bases of the calculating method of diffusion coefficient theoretically established by FICK No. 2
Law and the instrument detecting technique of rock diffusion coefficient, the influencing experiments of the repeatil-
ity and different conditions on the diffusion coefficient are conducted, the mechanisms of the influencing actions by
constant temperature, surrounding pressure and so forth are explored. The studies show that in the course of the
coefficient detection only by means of the above temperature, surrounding pressure and initially tested gas pres-
sure, can the influences on the detection of the diffusion coefficient under the changes of different conditions be a
voided. Through the experimental researches on the relation between the diffusion coefficient and permeability of the
rock samples for the gas cap rock with different gas-bearing abundances in the test area, the region with the coeffi
cient less than 10"cm/s in the area can establishes effective sealing; for the region larger than 10-cm/, it
difficult to form the same sealing, and moreover with the reduction of the diffusion coefficient, the sealing and con-
servation for the hydrocarbon are much more favorable
Key words: diffusion coefficient; experimentall method; geological action
收稿日期:2012-0507改回日期:2012-05-15
基金项目:国家油气重大专项课题(20117X05007)。
作者简介:曲秀英,女,1965年生,工程师,从事储层评价研究工作。
quxy@petrochina.com.cn