摘要
Chelif盆地的勘探在近半个世纪一直没有突破,是否存在有效烃源岩成为制约勘探决策的主要因素。在分析Chelif盆地地表和钻井样品地球化学特征的基础上,研究和预测了中—新生界烃源岩性质与分布,并且采用ΔlogR技术计算TOC含量以弥补露头采样的不足。研究显示,Chelif盆地是阿尔及利亚西北部的中—新生界叠合盆地。在白垩纪Chelif盆地处于被动大陆边缘的拉张构造环境,属于海相盆地;到新生代盆地演变为山间盆地,经历断坳演化过程,形成了快速充填的沉积特征。盆地发育上白垩统、下中新统和上中新统3套烃源岩,有机质丰度显示,该烃源岩为中等—好烃源岩,含Ⅱ型干酪根,有机质热演化处于低成熟—成熟阶段。上白垩统泥灰岩为盆地的主力烃源岩,盆地油气源较丰富,具有较好的勘探前景。
There was no breakthrough in exploration of Chelif Basin for nearly half a century, and whether effective source rocks existed or not had become the main factors of controlling exploration. According to the geochemical analysis of samples collected from outcrop and drilling core, characteristics and distribution of Meso- Cenozoic source rock were studied and forecasted. New technology to calculate TOC value by using AlogR could make up for the inadequacy of samples. As a superimposed basin of Meso-Cenozoic in the northwest of Algeria, Chelif Basin, at the passive continental margin in the period of Cretaceous, was in an extentional structural environment and was a marine facies basin. Chelif Basin evolved into inter-mountain basin in the period of Cenozoic, experiencing fault sag evolutionary process, and was characterized by fast-filling depositional features. The results show that： Upper Cretaceous, Lower Miocene and Upper Miocene source rocks developed, which were moderate-good source rocks according to the abundance of organic matter. Type of organic matter was Ⅱ kerogen, in low mature-mature phase. Upper Cretaceous marls were the main source rocks of Chelif Basin. Hydrocarbon resources were relatively rich, and the basin was a prospective area to explore in the next step.
出处
《现代地质》
CAS
CSCD
北大核心
2009年第5期908-915,共8页
Geoscience
