松辽盆地白垩系火山岩气藏有效储层特征及成因

发布时间：2018-03-19 21:33

本文选题：火山岩气藏　切入点：有效储层　出处：《天然气地球科学》2017年03期 　论文类型：期刊论文

【摘要】：依据80口钻井1 045m岩心描述,820件薄片鉴定和全直径岩心物性分析,以及220件压汞测试结果,结合试气产能资料,对松辽盆地北部徐家围子断陷白垩系营城组火山岩气藏有效储层特征及成因进行研究。结果表明:有效储层主要分布于流纹质熔结凝灰岩、流纹岩、粗面岩和玄武岩4类优势岩性,残余的原生气孔和粒间孔、石泡孔、溶蚀孔以及冷凝收缩缝5类有效孔隙贡献最大,孔隙结构具有大孔隙—细喉道的构成特点,喉道半径以微米级至纳米级为主。与非有效储层相比,火山岩有效储层发育相对粗大的喉道,具备低排驱压力和高进汞饱和度。基质孔隙和喉道对火山岩有效储层的渗透性能起控制作用,挥发份逸出作用和溶解作用是火山岩有效储层形成的关键因素。通过有效孔隙成因分析认为,流纹岩有效储层为原生孔隙型,玄武岩和粗面岩有效储层为原生孔隙充填残余—次生溶蚀改善型,流纹质熔结凝灰岩有效储层为原生孔隙压实残余—次生溶蚀改善型。
[Abstract]:According to the 1045m core description of 80 drilling wells, 820 thin pieces were identified and the physical properties of the whole diameter cores were analyzed, and 220 mercury injection test results were used to combine the gas test productivity data. The effective reservoir characteristics and genesis of volcanic reservoir in Yingcheng formation of Cretaceous system in Xujiaweizi fault depression in the north of Songliao Basin are studied. The results show that the effective reservoir is mainly distributed in fluvial melt tuff and rhyolite. Four types of dominant lithology, residual primary porosity and intergranular pore, stone bubble pore, dissolved pore and condensed shrinkage joint, contribute most to the four types of dominant lithology, and the pore structure is characterized by macroporosity and fine throat. The throat radius is mainly from micron to nanoscale. Compared with the non-effective reservoir, the effective volcanic reservoir develops relatively large throat. With low displacement pressure and high mercury saturation. Matrix pores and throat play a role in controlling the permeability of effective volcanic reservoirs, Volatilization and dissolution are the key factors in the formation of effective volcanic reservoir. Through the analysis of effective pore genesis, it is concluded that the effective reservoir of rhyolite is of primary pore type. The effective reservoirs of basalt and trachyte are primary pore filling residual and secondary dissolution improvement type, and the effective reservoir of fluid-melt tuff is primary pore compaction residual secondary solution improvement type.
【作者单位】：吉林大学地球科学学院;大庆油田勘探开发研究院;吉林大学古生物学与地层学研究中心;
【基金】：国家重点基础研究发展计划“973”项目(编号:2012CB822002) 国家自然科学基金项目(编号:41472304)联合资助
【分类号】：P618.13

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