摘要
石炭系火山岩是我国西部深部油气勘探新领域,在准噶尔盆地显示出广阔油气远景。针对盆地陆东地区火山岩储层岩心及露头样品地球化学分析、显微观察、扫描电镜和包裹体等综合研究,阐述了研究区火山岩储层特征及主控因素。陆东地区石炭系发育一套低钾富钠碱性—亚碱性系火山岩,主要为爆发相火山角砾岩和凝灰岩、溢流相玄武岩和安山岩。火山岩储集空间主要为次生溶蚀孔缝型、孔隙—裂缝复合型,爆发相火山角砾岩、溢流相玄武岩和安山岩物性最好。有利储层区带主要为风化体淋滤带,其次为崩解带。淋滤带以风化淋滤作用、构造破裂作用和热液蚀变作用为主,特别是热液蚀变形成沸石或方解石充填对储层演化具有重要意义。陆东地区石炭系火山岩储层发育的主控因素可以归结为断裂—火山岩风化体结构—岩性/岩相三级因素控制。
The Carboniferous volcanic rocks are an important new field for oil/gas exploration in the deep strata of western China.Great prospects have been proved in the volcanic rocks of Junggar Basin.This paper focused on the characteristics and controlling factors of volcanic rock reservoirs in Ludong area of the eastern Junggar Basin,based on microscopic observation,scanning electron microscopy.Additional samples were collected from the outcrop in eastern basin for geochemical analysis and temperature test of inclusions to establish the process of reservoir spaces.During the Later Carboniferous,the study area developed a suit of low potassium sodium alkali-rich and alkaline volcanic rocks,which mainly consisted of eruption（volcanic breccia and tuff）and overflow（basalt and andesite）facies volcanic rocks.Volcanic rock reservoir spaces are mainly secondary dissolution pores and fractured pores,and the reservoirs with best property are eruption facies volcanic breccia and overflow facies basalt,andesite physical.The favorable reservoir zone consisted mainly of weathered eluvial horizon,followed by collapse zone.The reservoirs in each zone were developed by weathering and leaching,tectonic fracture and hydrothermal alteration,especially the hydrothermal alteration which formed zeolite or calcite filling has important significance to the reservoir.The Carboniferous volcanic rock reservoirs in the study region are mainly controlled by the fracture distribution,and the weathering structure and lithology for the second and third controlling factors respectively.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2013年第6期1140-1150,共11页
Natural Gas Geoscience
基金
国家科技重大专项"大型油气田及煤层气开发"课题"深层有效储集体形成
分布规律与预测技术"(编号:2011ZX05008-003)资助
关键词
火山岩风化体
储层特征
主控因素
准噶尔盆地
Volcanic rock weathering body
Reservoir characteristics
Controlling factors
Junggar Basin
