摘要
川东北地区须家河组储层孔隙度、渗透率较低,为典型的致密砂岩储层,其主要储层流体类型有气层(低阻气层)、气水同层、干层和水层。而在开发生产中如何准确识别致密砂岩储层流体类型却存在一定难度,制约着研究区须家河组的勘探开发。为此,分析了难以准确识别须家河组致密砂岩储层流体类型的原因,并在此基础上应用2种常规流体识别方法对川东北地区须家河组致密砂岩储层的流体进行了识别,分析了其优缺点;同时尝试应用Fisher判别分析法识别储层流体,结果发现:根据Fisher判别分析法建立的判别函数能很好地区分研究区储层流体类型,其判别结果与实际生产情况符合率达到了92.3%,表明Fisher判别分析法在致密砂岩储层流体识别中能取得较好的应用效果。
The reservoirs of Xujiahe Formation in northeastern Sichuan basin,with low porosity and permeability,are typical tight sandstone reservoirs. The exploration results show that the main types of reservoir fluid are gas(gas with low resistivity),gas-bearing water,dry layer and water. But there are difficulties in accurately identifying the types of fluid in tight sandstone reservoirs,which has became a restriction during the exploration and development of Xujiahe Formation. Based on the above problems,after analyzing the reasons of the difficulties in accurately identifying reservoir fluids,two types of regular methods were proposed to identify Xujiahe tight sandstone reservoir fluids in northeastern Sichuan basin and the advantages and disadvantages of each method were analyzed. At the same time,the paper attempted to use Fisher discriminatory analysis to identify reservoir fluid. The canonical functions derived from Fisher discriminatory analysis could be used to easily distinguish reservoir fluid. The coincidence of the obtained results were 92.3% with the actual production situation,which showed that better effects could be obtained by this method in identifying types of fluid in tight sandstone reservoirs in the work area.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2015年第3期67-71,105,共6页
Petroleum Geology and Recovery Efficiency
关键词
致密砂岩
流体识别
FISHER
判别分析法
须家河组
川东北地区
tight sandstone
fluid identification
Fisher discriminatory analysis method
Xujiahe Formation
northeastern Sichuan basin
