摘要
不整合是由多个结构层组成的地质体,不同结构层具有不同的矿物学和地球化学特征,不整合结构层特征对地层油气藏的形成具有重要作用。根据济阳坳陷部分第三系不整合结构层的岩心观察、矿物及元素分析等,将不整合风化带划分为3类结构:Ⅰ1型结构,Ⅰ2型结构和Ⅱ型结构。系统分析了不同风化带结构层的矿物学、元素地球化学特征,结合化学风化指标对风化壳岩石风化程度进行了研究。结果表明,风化壳岩石风化程度的差异,导致不整合不同结构层呈现不同的矿物学特征,不整合结构层风化岩石相比未风化岩石具有富A l,Fe,Mn,Ti而贫Ca,Mg等特点。
The unconformity is a geologic body conformed by different structural layers which have different mineralogical and element geochemical characteristics. The characteristics of unconformity structural layers are important to the formation of stratigraphic reservoirs. Based on the core observation, mineralogical analysis, element content analysis, the unconformity structural layers in Tertiary of Jiyang depression were divided into three types of type I1, type I2 and type Ⅱ. The mineralogy and element geochemical characteristics in different structural layers were analyzed, and the weathering degrees were studied using chemical weathering index. The results show that different structural layers have different mineralogical characteristics due to the weathering degree of the rock. The weathered rock has the characteristic of rich in Al, Fe, Mn and Ti while lack of Ca and Mg when compared with the unweathered rock.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第5期7-11,17,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
中国石油化工股份公司重点科技攻关项目(P06012)
关键词
不整合结构
风化壳
地层油气藏
化学风化指标
地球化学特征
unconformity structure
weathering crust
stratigraphic reservoirs
Jiyang depression
geochemical characteristics
