长岭气田火山岩岩性和岩相特征及其对储集层的控制

Lithologic and lithofacies characteristics of volcanic rock and their control over reservoirs,Changling Gasfield

通过岩心观察、岩屑薄片分析、ECS成分识别以及FMI岩石结构及构造解释,共识别出2大类(火山熔岩和火山碎屑岩)8种(少孔和致密流纹岩、气孔流纹岩、原地自碎角砾化熔岩、晶屑熔结凝灰岩、含角砾晶屑熔结凝灰岩、火山角砾岩、火山集块岩和沉凝灰岩)火山岩岩性。以单井岩性识别及岩相划分为基础,应用地震属性分析、波形分类等方法,建立了3大类8种亚相的岩相模式。通过对火山岩储集层的储集空间类型、孔隙结构及孔缝组合进行分析,研究了原地自碎角砾化熔岩(溢流相顶部亚相)等岩性、岩相对火山岩储集层发育的控制作用,总结了长岭气田有利储集层分布规律及对应岩性、岩相特征,为油田开发方案优化及开发层位优选提供了依据。

Eight types of volcanic lithologies(less-pore and tight rhyolite,stomatal rhyolite,autochthonous autobreccia lava,crystal ignimbrite,crystal ignimbrite with breccia,volcanic breccia,volcanic agglomerate and sedimentary tuff) under two categories(volcanic lava and volcanic arenite) are identified using core observation,cuttings slice analysis,ECS component identification and FMI rock texture and structural interpretation.On the basis of single-well lithologic identification and lithofacies division,the facie...