摘要
鄂尔多斯盆地西缘深水斜坡相沉积是海相烃源岩发育的有利区带。为此,在综合研究该盆地西缘奥陶系海相烃源岩有机地球化学特征的基础上,通过对不同岩性、不同有机质丰度和不同成熟度样品的系统地化分析与比对,评价了其生烃潜力。研究表明:鄂尔多斯盆地西缘奥陶系烃源岩有机质丰度总体偏低,泥质岩和泥质灰岩的有机碳含量高于质纯的碳酸盐岩;有机质性质、生(排)烃能力与有机质丰度关系密切,随着有机碳含量增加,干酪根类型变好,生(排)烃能力也增强;下奥陶统克里摩里组—中奥陶统乌拉力克组是该区相对有利的生排烃层段,也是下古生界的主力生烃层段。
Deep water clinotherm on the western margin of Ordos Basin is favorable for the development of marine source rocks. Based on a comprehensive study of the organic geochemical features of the marine Ordovician source rocks on the western margin of Ordos Basin, their hydrocarbon generation potentials are evaluated through systematic geochemical analysis and correlation of samples with different lithologies, organic matter abundance and maturities. The results show that the organic matter abundance of the Ordovician source rocks is on the low side as a whole, while the TOCs of argillaceous rocks and shaly limestones are higher than that of the pure carbonates. The properties and hydrocarbon generation (expulsion) potential are closely related with the organic matter abundance, with the types of kerogen getting better and hydrocarbon generation (expulsion) potentials enhancing along with the increasing TOC. The Lower Ordovician Kelimoli-Middle Ordovician Wulalike formations are the relatively favorable intervals for hydrocarbon generation and expulsion in the study area and they are also the major hydrocarbon generation intervals in the Lower Paleozoic.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2007年第12期62-64,共3页
Natural Gas Industry
关键词
鄂尔多斯盆地
西缘
奥陶纪
烃源岩
碳酸盐岩
有机质丰度
生烃能力
评价
Ordos Basin, western margin, Ordovician, source rocks, carbonate, organic matter abundance, hydrocarbon generation potential, evaluation
