摘要
通过系统的野外剖面测量和样品采集,运用岩石热解、有机碳测试、有机显微组分镜检、气相色谱-质谱等对采集的样品进行分析测试,综合评价南陵—无为地区二叠系碳酸盐岩、煤和泥岩露头样品的有机质丰度、类型和成熟度,并分析有机质的来源及沉积环境。研究结果表明:栖霞组、孤峰组、龙潭组为有利烃源岩发育层段。其中栖霞组有机质类型为Ⅲ型,孤峰组为Ⅱ2型,有机质演化程度均处于高成熟阶段;龙潭组有机质类型为Ⅱ1型,处于成熟阶段。栖霞组烃源岩形成于受陆源影响的碳酸盐台地环境;孤峰组烃源岩形成于较深水的低能陆棚环境;龙潭组烃源岩形成于有陆源输入的滨岸环境。
Through systematic field geological profile survey, sample collection, analyses and technical tests of rock pyrolysis, determination of organic carbon, kerogen analysis, reflectance of vitrinite, saturated hydrocarbon gas chromatography and transmitted light illumination, the authors evaluated the organic concentration, type and maturity of the carbonate rocks, coal and mudstone samples in Permian system in Nanling-Wuwei area. Meanwhile, the original sedimentary environment and the biogenic origin characteristics of hydrocarbon source rocks were under discussion. The results showed that Qixia Formation （P1q）, Gufeng Formation（P1g） and Longtan Formation（P2l） were excellent hydrocarbon source rocks. The Qixia Formaiton and the Gufeng Formation were Ⅲ1 and Ⅱ2 organic matter types, respectively. The organic matters underwent high evolution and were in high maturity stages. The Longtan Formation with the Ⅱ1 organic matter type was also in high maturity stage. Hydrocarbon source rocks in Qixia Formation showed a marine-continental transitional environment. The sedimentary environments of hydrocarbon source rocks in Gufeng Formation were in a shelf environment with deep water and low energy. Hydrocarbon source rocks in Longtan Formation showed onshore depositional environment with terrigenous input.
出处
《地质学刊》
CAS
2013年第1期31-40,共10页
Journal of Geology
基金
中国石油化工股份有限公司科技项目(P10005)
关键词
二叠系
烃源岩
有机地球化学
南陵-无为地区
安徽
Permian system
Hydrocarbon source rock
Organic geochemistry
Nanling-Wuwei area
Anhui
