松辽盆地北部徐家围子断陷火山岩储层成因机制  

Volcanic rock reservoirs mechanism in North Songliao Basin Xujiaweizi Fault Depression

作　　者：韩刚[1] 张文婧[2] 任延广[2] 黄清华[2] 梁江平[2] 包丽[2] 

机构地区：[1]东北石油大学,大庆163318 [2]大庆油田有限责任公司勘探开发研究院,大庆163712

出　　处：《地球物理学进展》2011年第6期2114-2121,共8页Progress in Geophysics

基　　金：国家重点基础研究发展计划项目(2009CB219308)资助

摘　　要：松辽盆地北部徐家围子断陷徐深气田是我国迄今为止发现的最大的火山岩气田.营城组火山岩具有分布广、厚度大、岩性复杂等特点,既有酸性的流纹岩、流纹质熔结凝灰岩,也有中性的安山岩、安山质集块岩和基性的玄武岩.研究表明,酸性流纹岩、流纹质熔结凝灰岩普遍发育较好的原生气孔,而火山角砾岩、火山集块岩一般发育火山岩原生裂缝,这些为优质火山岩储层形成奠定了物质基础,成岩作用过程中深部流体活动和选择性溶蚀作用,不仅增大了火山岩的有效储集空间,同时也改善了火山岩储集层空间结构,而构造运动所形成的构造裂缝,不仅为深部流体活动和油气运移提供了主要通道,而且有效地增大了火山岩的油气储集空间.The Xushen gas field locates in Xujiaweizi Fault Depression of North Songliao Basin. It is so far the greatest volcanic rock gas field in China. The Xushen gas field develops typical Yingcheng Formation volcanic rocks. The Yingcheng Formation volcanic rocks have such characteristic as extensive distribution range, great thickness, and complex lithology. By using methods such as core and scanning electron microscope observation, body of casting slice, analysis and assay, we found the lithology of Yingcheng Formation volcanic rocks consist of not only acidic rhyolite, rhyolite-cementing tuff, but also neutral andesite, andesite-agglomerate and basic basalt. We conducted subtly researchs. The purpose is to see into the cause-mechanism of volcanic rocks reservoirs, and then provide reliable evidences in conducting oil-gas exploration, seeking favorable reservoirs and improving the success rate of prospecting well. Researches have made clearly that acidic rhyolite, rhyolite-cementing tufts develop generally preferable original pore, but volcanic breccias and volcanic agglomerates commonly develop volcanic primary fracture. These establish foundation for forming superior volcanic reservoirs. Deep fluid activities and selectivity dissolution during diagenesis not only magnify volcanic effective reservoir space, but also improve volcanic reservoir space structure. Diaclases formed by tectonic movement provide main gallery for deep fluid activity and oil-gas migration, and that them magnify effectively volcanic reservoir apace.

关 键 词：松辽盆地 徐家围子断陷 火山岩 储层 成因机制 

分 类 号：P631[天文地球—地质矿产勘探]