摘要
从钻井、薄片鉴定和化学分析入手,深入研究三塘湖盆地卡拉岗组火山岩的岩石类型、发育规律、化学成分特征.卡拉岗组火山岩以中基性的玄武岩、安山岩为主,化学成分以"高铝、低镁、低钾"为特征,属亚碱性系列中的钙碱性火山岩,FeO减少和Fe2O3富集的相对变化关系为卡拉岗组风化壳储层提供了理论依据.综合运用多种方法确定卡拉岗组火山岩形成于火山岛弧建造环境.
The rock types,development law and chemical components of the volcanic rock in the studied area are deeply studied for drilling data,thin-section identification and chemical analysis.It is shown that the volcanic rock is mainly composed of basalt and andesite,the chemical components of it are characterized by high content of aluminum,low content of magnesium and low content of potassium.The volcanic rock belongs to the calc-alkaline volcanic rocks of subalkalic series.The characteristics of FeO reduction and Fe2O3 enrichment provide the theoretical basis for the weathering crust reservoir of Kalagang Formation.It is determined that the volcanic rock is formed in the environment of volcanic island arc through many methods,which provides the reference for the study on the structural setting,evolution history and lithofacies paleogeography of Santanghu Basin.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2009年第5期23-28,35,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
中国石油天然气股份有限公司科技研发项目"岩性地层油气藏富集规律与勘探技术研究"(编号:2008B-01)
关键词
卡拉岗组
马朗凹陷
钙碱性
火山岩
地化特征
构造环境
Kalagang Formation
Malang Sag
volcanic rock
geochemical characteristic
structural environment
