新场须家河组五段非常规混合型储层测井评价

Unconventional Hybrid Reservoir Log Evaluation Technology for the 5th Segment of Xujiahe Formation in Xinchang area,Western Sichuan Basin

川西新场须家河组五段非常规天然气为典型自生自储式连续型天然气聚集,储层既非常规致密砂岩储层,也非典型的页岩气储层,属于非常规混合型储层,其测井评价方法、内容与传统的评价方法、内容有较大区别。在分析地质、测试、测井、录井以及实验分析等资料的基础上,重新构建新场须家河组五段非常规混合型储层测井评价技术体系,引入砂地比、互层率测井储层评价概念,结合孔隙度、含气饱和度、裂缝指数、总有机碳含量(TOC)、脆性矿物含量和岩石力学参数等多项指标,对新场须家河组五段气藏储层开展了综合评价,明确了有利储层的测井评价指标。该储层测井综合评价技术对于川西坳陷自生自储的非常规气藏储层评价有一定指导意义,值得推广。

The unconventional gas in the 5th segment of Xinchang area,Xujiahe formation is the typical authigenic reservoir continuous gas accumulation in the west of Sichuan.The reservoir is neither routine close sand reservoir nor typical shale gas reservoirs.It is unconventional mixed reservoir where log evaluation method is much different from traditional.Based on datum analysis of geology,logging and experiments,we rebuild well log evaluation technology system for this area.The sandstone/strata and cross layer rate are used in reservoir evaluation data,and combining with porosity,gas saturation,fracture index,TOC,brittleness mineral content and mechanics parameter of rock,etc.,we comprehensively evaluate the 5th segment of Xujiahe formation and determine log evaluation index of favorable reservoir.The technology provides a strong support for unconventional gas reservoir development in western Sichuan depression basin.