鄂尔多斯盆地奥陶系碳酸盐岩有机岩石学特征
The Organic Petrology Feature and Carbon-Forming Potentiality Evalution of Ordovician Carbonate in the North of Ordose Basin
Abstract
采用有机岩石学方法来探讨盆地北部奥陶系碳酸盐岩的有机岩石学特征，在工作区检测到的类镜质体显微组分，如实反映本区有机质演化程度.本区碳酸盐岩中沥青的赋存状态多样，主要为基质型一孔洞型一裂缝型，根据沥青的地质特点，判识本区沥青属原生一同层，为在盆地寻找自生自储的油气提供了理论依据. The abundance of residual organic matter is low and evolutionary degree is high to Ordovician carbonate in Ordose basin.Traditional organic geochemistry can't evaluate eFFectively carbon-Forming potentialy of hydrocarbon source rock.So, this article researches comprehensively and appraise hydrocarbon source rock in the north of the basin, by combining a new method-organic Petrology appeared recently with organic geochemistry.Based on the studies,Vitrinite-Like Macerals was examined and Found in the basin For the First time.So, the Virtinite-Like reFlectivity measured enhances reliable degree of determining evoluationary extent of organic matter.Asphalt in carbonate shows various existence pattern dominated by matrix type,corroded hollow type and Fissure type.According to geology characteristics, the asphalt in this area is decided protogenous-home layer.Thes studies provide theoretical base that selF-Forming and selF-reserivoir oil-gas Field can be Found in the north of the basin.