疏松砂岩岩石电阻率实验方法.pdf

第34卷增刊
石油钻采
Vol 34 Sup
2012年9月
OIL, DRILLING &PRODUCTION TECHNOLOGY
Sept. 2012
文章编号:1000-7393(2012)S0-0095-03
疏松砂岩岩石电阻率实验方法
刘志伟曲日涛任志勇李冰唐磊
(中海石油能源发展股份有限公司钻采工程研究院,天津300452)
引用格式:刘志伟,曲日涛,任志勇,等.疏松砂岩岩石电阻率实验方法J]?石油钻采エ,2012,34(S0):95-97
摘要:渤海地区部分油田储层埋藏浅,胶结性差,在钻井取心提升至地面过程中,温度变化和压力的释放使岩心更加松散
按照常规取样方法无法获得合格样品进行准确的数据分析。提出了一种疏松砂岩岩石电阻率实验室测定的新方法。采用冷冻
钻取、铅套包封等措施,对样品柱寒进行特殊处理,在覆压状态下进行岩石电阻率测试,较好地解决了疏松砂岩岩石电阻率测量
数据异常等技术难题。覆压岩石电阻率测定方法在渤海油田多个疏松砂岩储层測井炮和度计算、油田m、m值变化规律和主要
影响因索分析及疏松砂岩孔渗特征研究中进行了应用,取得了较为理想的结果。
关键词:疏松砂岩;压测试;岩石电阻率;测定方法
中图分类号:P631.8文献标识码:A
Rock electrical resistant testing method for unconsolidated sandstone
LIU Zhiwei, QU Rita0, REN Zhiyong, LI Bing, TANG Lei
Research Institute of Drilling and Production Engineering, CNOOC Energy Development Co Ltd, Tianin 300452, Chind
Abstract: Some of the oilfields in Bohai region are featured by shallow buried bed depth and poor cementation of sandstone
During the process of coring while drilling and the core becomes more loosely when up to ground with temperature change and stress
release, so that it is difficult to gain standard core sample and accuracy analyzed data as conventional. A new rock electrical resistant
testing method for unconsolidated sandstone was proposed in this paper Sample plunger was conducted special treatment by adopting
the measures of frozen drilling and lead sleeve sealing, and then rock electrical resistant testing was carried out under overburden pres
sure condition. This method easily solves the technique problems of data exception in rock electrical resistant testing for unconsolidated
sandstone Rock electrical resistant testing method with overburden pressure has been applied in several unconsolidated sandstone reser
voirs studies in Bohai oi eld, nuing log ng saturaion ca laton, hang le an many affecting aors of i field parameters m
and n porous and permeability characteristics of unconsolidated sandstone The results indicate that the new method was extraordinarily
effcient for similar reservoirs
Key words: unconsolidated sandstone; overburden pressure test; electric resistant of rock; measuring method
渤海地区近几年来发现和评价的上第三系浅层1.02.2,胶结砂岩一般在1.8-2.0之间,非胶结的疏
河流相沉积的油田居多,油田的主力含油层系多发松砂岩大于1.3)1。合理的岩电实验参数a、b、m
育于上第三系明化镇组下段和馆陶组,储层岩性为的取值对于饱和度的计算结果具有很大影响,也
河流相沉积的陆源碎屑岩,沉积相为辨状河、曲流河直被作为划分油水界面及评价储层的含油性及含油
或浅水三角州沉积,储层具有中高孔、渗特征。运用程度的重要指标,尤其在油田注水开发后期,研究储
常规分析方法测得的岩石电阻率分析结果m、n值层电阻率变化特点对搞清储层的油水分布状况具有
通常会超出理论及经验值范围(m的理论值通常为重要意义[2。
作者简介:刘志伟,1962年生。現从事特殊岩心实验及岩石电阻率实验分析研究工作。电话:0225808441。E-mail: liuzhi(@cnooc
com.cns