摘要
在低渗透火山岩储层中,由于井眼环境和岩性骨架对常规补偿中子的影响,测井信息的信噪比比较低,在识别气层尤其是低阻气层时符合率比较低。为此,介绍了一种新的测井方法——加速式中子源孔隙度测井(APS),该方法提高了中子产额,增加了探测器数量,采用了背屏蔽设计,优化了选择探测器源距。从测量结果上来看,该方法能降低岩石骨架和井眼环境对于测量结果的影响,提供了多个孔隙度测量结果。以大庆徐深8井为实例,阐述了APS测井在识别低孔、低渗、火山岩气层、水层中的应用,解决了常规测井无法判别油气水的问题,射孔试气证明了APS测井的有效性。从综合应用效果看,APS测井在识别低阻气层方面具有一定优势。
In the volcanic reservoir with low permeability,the signal-to-noise ratio of the logging data is relatively low due to the influence of borehole environment and lithologic framework on Compensation Neutron Logging(CNL),which will result in low coincidence rate for gas reservoir recognition,especially,for low-resistivity gas reservoir.Therefore,the paper introduced a new logging method,accelerating neutron porosity logging(APS),which will increase neutron yield and the number of the detectors,adopting back screen design and optimizing the source spacing selection of the detectors.The measure results show that this method can not only reduce the influence of the borehole environment and the rock framework,but also provide various porosity measure results.Taking the well-8 in Xushen Gasfield as an example,this paper described how APS logging was used in gas-bearing/water volcanic reservoirs with low porosity and low permeability,and suggesting the method rather than conventional logging methods could distinguish oil,gas,and water easily,and its validity could be further verified by the perforation test as well.The comprehensive application effects indicate that APS has lots of advantages in identifying the gas reservoirs with the low resistivity.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2007年第8期35-37,共3页
Natural Gas Industry
基金
中国石油天然气集团公司创新基金项目(编号:04E7023)资助
关键词
孔隙度测井
火山岩
气层
电阻率
松辽盆地
应用
效果
porosity logging,volcanic,gas reservoir,resistivity,Songliao Basin,application,effect
