辽河坳陷结晶基底岩性特征、含油性及测井识别

摘要

辽河坳陷结晶基底油气资源丰富,在辽河的三大凹陷基底潜山以及中央凸起均发现规模油气藏.本文通过系统分析岩芯、岩屑和旋转井壁取芯荧光、铸体和传统岩石薄片,对辽河坳陷太古宙基岩及其中的侵入体的岩石类型、含油性、储层成因及影响因素等进行了综合研究.结果表明,辽河坳陷结晶基底岩石包括2大类、14个亚类、30多种岩石类型;岩石的含油性与岩石类型、构造作用和古风化溶蚀淋滤作用的改造密切相关.在对不同岩性岩石的物理特征与测井曲线特征大量对比分析和研究基础上,建立了岩性与测井曲线的对应关系,实现了基岩岩性的测井识别,为勘探部署、储量计算等奠定了基础,也为类似基岩油气藏的勘探研究提供重要借鉴.%Objectives:The oil and gas resources are rich in the crystalline basement of the Liaohe Depression.Large oil and gas reservoirs have been found in basement buried hills of all the three major sags and central uplift of the Liaohe depression.we focus our study on rock types,mineral composition,oil-bearing property,reservoir genesis and its effect factors of the crystalline basement,Archean metamorphic rocks and the intrusions,in Liaohe Depression This research not only establishes foundation for exploration deployment,and estimation of oil reserves,but provides important reference for the similar crystalline basement reservoirs exploration.Methods:The system cores,rock debris,rotary sidewall,casting and conventional thin section inspection.large number of comparative analysis between rock physical characteristics and its logging curve characteristics.Results:The crystalline basement of Liaohe Depression contains 2 categories,14 subcategories and more than 30 types of rocks.Conclusions:The oil bearing property of rock is closely related to the rock type and the modification of tectonic deformation as well as the ancient weathering dissolution leaching effect.we construct the corresponding relations between lithology and the logging curve,implement the crystalline basement lithology logging identification.