摘要
松辽盆地深层发育多种类型的火山岩,勘探实践表明,在不同类型的火山岩中均有油气显示。为了进一步明确研究区有利火山岩储集层的特征,利用岩心、薄片和分析化验资料对火山岩的储集空间、孔隙结构和物性特征开展了对比性研究。分析结果表明,原生气孔在不同类型火山岩中的分布极不均匀,次生孔缝次之,原生微孔和原生裂缝分布较均匀;火山岩孔隙结构可分粗孔喉、中-粗孔喉、偏粗孔喉、细孔喉和极细孔喉5种类型;火山岩储层孔隙度分布特征分单峰高孔、双峰高孔、中孔、中-低孔、偏低孔和低孔6种类型;火山岩储层渗透率分布特征可以概括为高渗、中-高渗、中渗、中-低渗和低渗5种。综合以上4种参数,认为气孔流纹岩、流纹构造流纹岩、球粒流纹岩、熔结凝灰岩、角砾熔岩和火山角砾岩是有利储层发育带,凝灰岩、块状玄武岩、沉凝灰火山角砾岩和沉凝灰岩相对而言储集性能较差。
Abstract
Different types of volcanic rocks are developed in Songliao Basin.Exploration activities revealed that oil/gas shows occur in all the volcanic rocks.In order to further understand the characteristics of favorable volcanic reservoirs,a comparative study for reservoir space,pore structure and physical property is conducted by using core,thin section and test data.The distribution of primary voids are extremely uneven in different types of volcanic reservoirs,that of secondary pores and fractures is better,and that of primary micropores and fractures is relatively even.Five throat types are identified,including coarse throat,medium-coarse throat,fine throat on the high side,fine throat and very fine throat.There are 6 types of porosity distribution,including high porosity with single peak,high porosity with double peak,medium porosity,medium-low porosity,lower porosity and low porosi-ty.Permeability distribution can be grouped into five types,namely high permeability,medium-high permeability,medium permeability,medium-low permeability and low permeability.Based on the four parameters mentioned above,it is believed that vesicular rhyolite,rhyotaxitic rhyolite,spherulitive rhyolite,ignimbrite,brecciated lava and breccia reservoir have good poroperm characteristics,while tuff,massive basalt,tuffaceous breccia and sedimentary tuff are poor in reservoir quality.
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