摘要
川东北飞仙关鲕滩储层普遍存在高电阻率现象 ,给储层识别和流体性质判别带来了很大的困难。从模型模拟和实测资料 2个方面研究了岩性、饱和度、孔隙结构和侵入特性对川东北飞仙关鲕滩高电阻率储层的影响。结果表明 :当其它因素不变时 ,泥质含量对电阻率影响程度的范围是 0～ 10 % ,飞仙关鲕滩储层极低的泥质含量是飞仙关鲕滩储层高电阻率出现深浅双侧向大幅度正差异的前提条件 ;其储层孔隙结构复杂和高含气饱和度是形成高电阻率储层深浅双侧向正差异的一个重要原因 ;另一方面 ,鲕滩储层发育的溶蚀孔洞由于大小、充填情况及连通情况千差万别 ,导致深浅双侧向曲线相关性差 ,增加了两者幅度值的差异。综合分析各种因素 ,才能准确评价川东北飞仙关鲕滩高电阻率储层。
There are many difficulties for judging reservoir and fluid properties because of the Feixianguan Ertan high resistivity zones in the north-east Sichuan. Analyzed are effects of lithology,saturation, porosity and infiltrative character on the zones with modeling and logging data, the result of which shows that effect of shale content on resistivity is 0～10% when other factors don't change,so, the lowest shale content is a premising condition that the deep and shallow dual laterolog curves of the zones appear a large positive amplitude difference; The complex pore structures of the reservoir and extra high gas-bearing saturation are other important factors. On the other hand, the different developed cavities,fillings and cavern connection of the reservoir also cause a poor correlation between the deep and shallow dual laterolog curves and increase the difference between the deep and shallow curve values. We can exactly evaluate the Feixianguan Ertan high resistivity reservoir by analyzing the factors.
出处
《测井技术》
CAS
CSCD
2004年第6期537-539,共3页
Well Logging Technology
关键词
高电阻率储层
泥质含量
饱和度
孔隙度
侵入特征
high resistivity zone
shale content
saturation
porosity
invasion character
