气藏渗流屏障测井识别方法及应用——以四川盆地中部蓬莱地区须二段为例

Logging Identification of Seepage Barriers of Gas Reservoir in the 2^(nd) Member of Xujiahe Formation in Penglai Area of Sichuan Basin and Its Application

四川盆地中部蓬莱地区上三叠统须家河组须二段气藏已具有一定开采程度,为了寻找地下可能残余剩余天然气的地区,在岩心观察的基础上,结合薄片资料、测井资料等,识别出影响须二段储层剩余气分布的不同渗流屏障类型,并建立了不同渗流屏障的测井识别标准;在各井渗流屏障划分的基础上,以测井资料为约束,通过井间追踪对比,分析和探讨了影响渗流屏障形成与分布的各种地质因素,总结了不同渗流屏障的成因及其展布特征。通过探讨渗流屏障特征、展布及其与剩余气分布规律的关系,为研究区下一步开发层序的划分及进一步的井位部署提供指导。

The development extent of gas reservoir in the 2nd member of Xujiahe Formation of Penglai Area in the middle of Sichuan Basin was relatively high.To fine the areas with possible remaining gas,different types of seepage barriers of the remaining gas were identified based on the geologic data of observation and description of cores in combination with thin slice and well logging data and criterion for logging of different seepage barriers was established.The geological factors affecting the generation and distribution are analyzed and discussed on the basis of identifying seepage barriers,constraining of logging data and through interwell contrast and the genesis of various seepage barriers is summarized.The distribution characters of seepage barriers and distribution rules of remaining gas in Penglai Area are studied by the means of inter-well tracing and correlation,it provides guidance for stratigraphic sequence identification in Penglai Area.