松辽盆地南部英台断陷营城组火山岩晶间微孔特征及储层效应  

Intercrystalline micropore characteristics and reservoir effect of Yingcheng Formation volcanic rock in Yingtai fault depression,southern Songliao Basin

作　　者：高有峰[1] 吴艳辉[2,3] 刘万洙[2] 瞿雪姣[2] 唐华风[2] 

机构地区：[1]吉林大学古生物学与地层学研究中心,吉林长春130026 [2]吉林大学地球科学学院,吉林长春130061 [3]吉林省安全科学技术研究院,吉林长春130051

出　　处：《石油学报》2013年第4期667-674,共8页Acta Petrolei Sinica

基　　金：国家重点基础研究发展计划(973)项目(2012CB822002和2009CB219305);国家自然科学基金项目(No.41002038)资助

摘　　要：松辽盆地南部英台断陷营城组火山岩中普遍发育晶间微孔隙，主要由重结晶作用和溶蚀作用形成。按成因和骨架颗粒的种类可将晶间微孔分为放射状碱性长石晶间微孔、黏土矿物晶间微孔和混合矿物晶间微孔3种类型。基质发生脱玻化重结晶作用，形成球粒状钾长石的区域晶间微孔面孔率为5．2％，形成黏土矿物和石英长石雏晶的区域面孔率增加9．5％～13．6％；长石发生局部溶蚀形成伊利石的区域，面孔率可增加6．5％～10．1％；而伊利石充填火山碎屑岩的粒间孔隙，仍可保留223％的晶间微孔型储集空间。结合英台断陷勘探实例，认为晶间街孔痔畜的次，1。Volcanic intercrystalline micropores mainly formed by recrystallization and dissolution develop widely in the Yingtai fault depression, southern Songliao Basin. According to the genesis and types of skeleton grains, volcanic intercrystalline micropores can be divided into three types, i.e. intercrystalline micropores of radial alkali feldspar, clay minerals and mixed minerals. Surface po- rosity analyses showed that due to the devitrification of matrix, the porosity of intercrystalline micropores in the spherulitic K-feld- spar region amounts to 5.2%, the porosity of intercrystalline micropores in the region of clay minerals and quartz-feldspar crystal- lites increases from 9.5% to 13.5%, the porosity of intercrystalline micropores in the region where partial feldspar alters to illite may increase to 6.5% ~ 10. 1%, while intergranular pores o{ pyroclastic rocks filled with illite can still retain a porosity of 22.3 % for intererystalline micropores. Combined with the exploration practice in the Yingtai fault depression, we suggested that volcanic rocks with rich intercrystalline micropores can serve as a favorable reservoir of natural gas.

关 键 词：松辽盆地 营城组 火山岩 晶间微孔 成岩作用 

分 类 号：TE112.222[石油与天然气工程—油气勘探]