摘要
鄂尔多斯盆地及邻区中元古代整体处于地壳伸展的构造背景,沉积了巨厚的中元古界蓟县系海相地层。为落实该盆地西南缘蓟县系油气的勘探潜力,对该区蓟县系的地层特征、沉积特征、岩石地球化学和有机地球化学特征进行了分析。结果表明:该区蓟县系形成于碳酸盐潮坪沉积环境,风暴沉积序列广泛发育;该区具有大陆边缘性质,蓟县系硅质岩为生物成因背景。结论认为,从蓟县系可能烃源岩的有机质丰度、类型及有机质成熟度等方面来评价了其生烃潜力,认为其生烃能力较差。
The Ordos basin and its adjacent areas were in an extensional tectonic setting in the Mesoproterozoic when the ultra-thick marine Jixian system was deposited in the study area. A comprehensive analysis of the stratigraphic features, sedimentary characteristics, lithogeochemical and organic geochemical features of the Jixian System in the southwest margin of the Ordos basin was performed to determine its exploration potential. The results show that the Jixian System in the study area was deposited in a carbonate tidal flat environment where storm deposits were extensively developed and the study area had the nature of continental margin where the Jixian silica rocks was of biogenetic origin. Based on an appraisal of the abundance, types and maturity of organic matter of the possible source rocks in the Jixian System, it is believed that its hydrocarbon-generating potential is relatively low.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2009年第3期21-24,132,共4页
Natural Gas Industry
基金
国家重点基础研究发展计划(973计划)(2003CB214601)的资助
关键词
鄂尔多斯盆地
中元古代
蓟县系
沉积环境
生烃潜力
评价
Ordos basin, Mesoproterozoic, Jixian System, sedimentary environment, hydrocarbon-generating potential, evaluation
