内蒙古二连盆地洪浩尔舒特凹陷白垩系火山岩储集层

Volcanic rock reservoir of the Cretaceous in Honghao'ershute Sag in Erlian Basin,Inner Mongolia

内蒙古二连盆地火山岩分布极为广泛,在古生界(含变质岩)及中生界的侏罗系和白垩系均有分布。位于盆地内乌尼特坳陷的洪浩尔舒特凹陷发育有3套火山岩,主要分布在白垩系阿尔善组上段、阿尔善组下段和腾格尔组一段,火山岩主要为安山岩,次为凝灰岩和少量火山角砾岩。火山岩储集空间类型主要为气孔和火山灰溶孔,孔缝组合类型有孔隙型、裂缝—孔隙型、孔隙—裂缝型和裂缝型。储集层物性受火山岩岩相、成岩作用和构造活动影响,以岩相影响最显著。储集层发育总体上中央洼槽中部和东部较好。

The volcannia rocks are widely distributed in the Erlian Basin of Inner Mongolia,and mainly developed in the Paleozonic（including metamorphic rocks）,Mesozoic Jurassic and Cretaceous.These sets of volcanic rocks are developed in the Upper and Lower Memebers of Cretaceous A＇ershan Formation and the Member 1 of Tenge＇er Formation in Honghao＇ershute Sag of Wunite Depression.The volcanic rocks are dominated by andesite with tuff and a few amount of volcanic breccia.The reservoir space types of volcanic rocks include gas pore and volcanic ash dissolution pore,and the pore-fissure association includes pore type,fissure-pore type,pore-fissure type and fissure type.Volcanic rock facies,diagenesis and tectonic movements are the main factors influencing reservoir petrophysical properties,in which diagenesis is the dominant one.Reservoirs are well developed in the central and eastern areas of subsay.