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根据包裹体分析、伊利石K-Ar同位素测年、油气水界面追溯法等多种方法综合分析认为,塔里木盆地克拉通区海相油气藏主要有晚加里东-早海西期、晚海西期和喜山期3期成藏以及燕山期和喜山期2期调整再成藏.其中晚海西期是现存原生油藏的主要形成时期,燕山期特别是喜山期是古油藏的调整再成藏时期,喜山期也是气藏的主要形成时期.目前发现的古生界油藏主要是晚海西期形成的原生油藏,中生界油藏则主要为喜山期调整再聚集形成的次生油藏.塔里木盆地克拉通区油气藏之所以普遍出现晚期调整现象,主要与中新生代特别是晚第三纪以来塔里木盆地频繁而强烈的构造变动以及晚喜山期高过成熟天然气的强烈气侵作用有关,另外克拉通区油藏幅度普遍较低也是造成早期油藏易发生调整的一个重要原因.因此,构造相对稳定的继承性古隆起和古斜坡区,是塔里木盆地寻找大中型海相原生油藏的主要地区.
According to the comprehensive analysis of many methods such as inclusion analysis, K-Ar isotopic dating of illite and retrospective hydrocarbon-water interface, it is concluded that the marine reservoirs in the craton area of Tarim Basin are mainly Late Caledonian-Early Hercynian, Period Himalayan period 3 and later Yanshanian period and Himalayan period 2. The Late Hercynian period was the main formation period of the existing primary reservoirs, and the Yanshanian period, especially the Himalayan period, was an ancient reservoir During the re-accumulation period, the Himalayan period is also the main formation period of the gas reservoirs.The present Paleozoic reservoirs are mainly formed in the late Hercynian reservoirs, while the Mesozoic reservoirs are mainly adjusted for the Himalayan period The secondary reservoirs formed in the Qiangtang Basin in the Tarim Basin are generally characterized by late-stage adjustment, which is mainly due to the frequent and intense structural changes of the Tarim Basin since the Late Cenozoic, especially to the Late Hemishan Period In addition, the relatively low amplitude of oil deposits in the Craton area is also an important reason for the early occurrence of oil reservoirs to be easily adjusted.Therefore, the relatively stable inherited paleohighs and paleo-slopes of Tarim The basin is looking for major areas of large and medium-sized marine primary reservoirs.