摘要
通过对合肥盆地深部发育的寒武系凤台组和北淮阳型石炭系两套海相烃源岩地化特征的研究,认为两套烃源岩已进入热演化过成熟阶段。盆地内钻探的合深2井在第三系棕褐色泥岩、页岩及砂岩罐装样中见到高达10000μl/L以上的吸附烃含量,这也是目前井中所见到的最为可靠的油气显示;2005年合武铁路施工隧道在大别造山带内发生多次可燃气体燃烧现象,具有明显的区域性,通过综合分析推测盆地深部寒武系凤台组和北淮阳型石炭系两套海相烃源岩可能是合深2井吸附烃和隧道可燃气的主力气源岩。另外,对国内外海相盆地类比分析展示了合肥盆地深部海相层系良好的勘探前景,因此下步勘探重心应从"中新生代盆地系统"转移到"深部海相层系",以寻找"古生古储"或"古生新储"类型油气藏为主。
By studying the characteristics of Cambrian Fengtai Formation and the Carboniferous system of North Huaiyang Formation,which were both marine deposits indicated by the characters of geochemistry of marine source rocks,it was considered that they were at over mature stage of thermal evolution.More than 10000ul/L adsorbed hydrocarbon was found in Palaeogene brown mudstone,shale and sandstone canned samples in Well Heshen 2,that was the most reliable oil-gas shows currently. Burning of combustible gas was found in Dabie orogenic belt in 2005 when the Hewu railway tunnel was constructed,it had distinct regional property,so the Cambrian Fengtai Formation and the Carboniferous system of North Huaiyang Formation are the main gas source rocks of adsorbed hydrocarbon in Well Heshen 2 and tunnel combustible gas. By comparing to the other basins not only in China but also in other countries,it is demonstrated that the deep marine sequence stratigraphy in Hefei Basin has good exploration prospects,so the next step should be focus on the exploration from 'Meso-Cenozoic basin system' to 'deep marine sequence stratigraphy',to find the main type of oil and gas reservoirs of Paleozoic source and Paleozoic reservoir or'Paleozoic source Cenozoic reservoir'.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2010年第4期176-180,共5页
Journal of Oil and Gas Technology
关键词
合肥盆地
油气显示
轻烃丰度异常
海相层系
烃源岩
Hefei Basin
oil-gas shows
gas
Well Heshen 2
unusual abundance of light hydrocarbon
marine sequence stratigraphy
source rocks
