摘要
沥青垫是油气藏中沥青质相当富集的含油储层带，其沥青质的相对含量为２０％～６０％，而对应的油层中其值不足２０％，沥青垫在凝析油气藏和轻质油藏中出现的频率高，常位于非渗透性隔层之上的高孔隙和较高水平渗透率的砂岩储层中。研究表明沥青垫的主要形成机理为：脱沥青作用、重力分离作用、生物降解作用和油—水相互作用。
Tar mat is a reservoir zone containing petroleum strongly enriched in asphaltene in oil and gas reservoirs.The relative asphaltene abundance of gross composition ranges from 20% to 60%,but the value is below 20% in the related oil layer Tar mats are often found in condensate oil and gas reservoirs and light oil reservoirs,and they are situated in high porosity and high horizontal permeabillity sandstone layers above permeability barriers.Several main processes leading to tar mat formation have been proposed,including deasphalting,gravity segregation of oil columns,biodegradation,water oil interactions,and petroleum migration.
出处
《地质科技情报》
CAS
CSCD
北大核心
1997年第1期81-84,共4页
Geological Science and Technology Information
关键词
沥青垫
油气藏
形成机理
tar mat,oil and gas reservoir,advance,formation mechanism
