摘要
利用油气碳同位素、生物标志化合物等地球化学分析手段,明确了满加尔凹陷及塔中深层寒武系-下奥陶统烃源岩、古油藏裂解气是形成塔中Ⅰ号坡折带大型凝析气田的主要烃源;利用包裹体、储集层地球化学分析技术,结合烃源岩演化史、构造发展史以及储集层演化史对成藏期次及油气运移聚集进行研究,指出塔中Ⅰ号断裂及晚期深大走滑断裂、塔中古隆起形成过程中的多期不整合是礁滩复合体油气成藏的主要油气输导体系;晚加里东运动期是油气聚集期,晚海西运动期是古油藏油气调整期,喜马拉雅运动期是古油藏裂解气对早期油藏气侵的多期充注期;礁滩复合体强非均质性和输导体系的差异是导致流体分布复杂的主要因素;指出了塔中Ⅰ号坡折带外带富气、内带富油分布的油气分布规律,丰富了塔里木盆地海相碳酸盐岩油气成藏理论。
Using carbon isotope, biological marker compound and other geochemical analysis methods, it is conformed that the Cambrian- Lower Ordovician source rocks and the paleo-oil reservoir cracking gas are the key factors for forming the large-sized condensate gas field in Tazhong No.1 slope-break zone; using inclusion and reservoir geochemical analysis technologies, combined with the source rock evolution history, structural history and deposition-reservoir evolution history to study the period of time and the migration of the hydrocarbon accumulation, this paper presents that Tazhong No.1 fault, the late deep strike-slip faults and multi-stage unconformities in process of shape of Tazhong paleo-uplift are the main transporting systems, thus clarifying the dynamic process of hydrocarbon accumulation in late Caledonian episode, paleo-oil reservoir adjustment, oil-gas transfer and generation from source rocks in late Hercynian episode, as well as multi-stage oil-gas charging processes of cracking gas in Himalayan paleo-reservoir into early oil reservoirs. In particular, this paper points out that the heterogeneity of reef-shoal complex and the diversity of transporting system are the key factors resulting in complex fluid distribution, hence develops the multi-stage charging and multi-stage adjusting hydrocarbon accumulation models. This study shows the characteristics of gas rich in outer zone and oil rich in inner zone of Tazhong No.1 slope-break zone, which enriches the theory of hydrocarbon accumulation in marine carbonate rocks in Tarim basin.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2008年第3期323-326,共4页
Xinjiang Petroleum Geology
基金
国家973重点基础研究发展计划项目,中国西部典型叠合盆地油气成藏机制与分布规律(2006CB2023)资助
关键词
塔里木盆地
塔中I号坡折带
礁滩复合体
大型凝析气藏
多烃源
多期成藏
Tarim basin
Tazhong No.1 slope-break zone
reef-shoal complex
giant condensate field
multiple oil sources
multi-stagehydrocarbon accumulation
