摘要
塔中地区火成岩形成于早二叠世末，其产状包括层状火山岩、火山岩颈、岩脉等。对各类火成岩体的地震反射特征进行了描述。层状火山岩分布于下二叠统顶部，其厚度较薄，在地震剖面上表现为两个近平行的低频高振幅强反射同相轴；火山岩颈呈不规则柱状体刺穿震旦至石炭纪地层，并直接与二叠纪层状火山岩相接，古地貌显隆起特征，内部呈杂乱反射；岩脉一般由与层理斜交的两个强反射同相轴组成，常成组发育并呈Ｖ形或凹槽状反射。与火成岩有关的圈闭类型主要有岩颈刺穿圈闭、岩颈上覆地层中的差异压实背斜或披覆背斜、拱张背斜及岩脉侧向遮挡圈闭等。
Seismic reflection features of subsurface igneous bodies in TZ area of Tarim basin,including stratiform basalts,volcanic necks,dikes,etc ,are described Stratiform basalts are interbedded with siliciclastic rocks at the top of lower Permian, displaying two parallel high amplitude reflection events in seismic profiles Volcanic necks are characterized by columnar geometry and chaotic reflection configuration in seismic data Dikes exibit two parallel strong reflection events usually cutting through stratification,and channel like geometry which may be mistaken as incised valleys Traps associated with igneous rocks comprise diapiric traps,differential compaction domes or drape traps over diapiric volcanic necks, and traps with dikes as well as lateral seal,etc
出处
《江汉石油学院学报》
CSCD
北大核心
1997年第3期34-37,共4页
Journal of Jianghan Petroleum Institute
关键词
地震相
油气聚集
火成岩
盆地
圈闭
seismic stratigraphic interpretation
seismic facies
structural trap
igneous rock
Tarim basin
