Immature oil and condensate: modification of hydrocarbon generation model for terrestrial organic matter
Immature oil and condensate: modification of hydrocarbon generation model for terrestrial organic matter
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DOI：
10.1306/03b5a313-16d1-11d7-8645000102c1865d
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发表时间：
1982-06
期刊：
影响因子：
3.5
通讯作者：
L. Snowdon;T. Powell
中科院分区：
文献类型：
--
作者：
L. Snowdon;T. Powell
在加拿大边境盆地的储层中发现了石油，这些储层经历了低水平的热蚀变（镜质组反射率<=0.6%Ro）。石蜡指数，稳定的碳和氢同位素含量，姥鲛烷nC 17的比率，和二萜类生物标志物已被用来评估成熟度的水平，在储层中的碳氢化合物的储层本身和周围的页岩单元的成熟度水平的独立。在Beaufort-Mackenzie盆地的第三系中，环烷油和凝析油是由与储层并列的源岩中的陆源有机质生成的，反射率水平为0.4至0.6%Ro。然而，在拉布拉多大陆架上热未成熟的储层中发现的凝析油经历了广泛的垂直迁移，可以被归类为常规成熟到过成熟凝析油。在Beaufort-Mackenzie盆地的下白垩统发现的碳氢化合物以及在斯科舍大陆架发现的碳氢化合物或多或少都在原地，因为它们的热蚀变水平大约相当于它们被困其中的储层的热蚀变水平。早期油和凝析油的来源被认为是分散在煤碎片中的树脂体。树脂体、脂质体和镜质体在陆源源岩有机质中的比例强烈地控制着该剖面作为有效源岩所需的热蚀变水平和将生成的最终产品（天然气、石油或凝析油）。
Petroleum has been found in Canadian frontier basins in reservoirs which have undergone low levels of thermal alteration (vitrinite reflectance <=0.6%Ro). Paraffin indices, stable carbon and hydrogen isotope contents, pristane to nC17 ratios, and diterpenoid biologic markers have been used to assess the level of maturity of the hydrocarbons in the reservoir independently of the level of maturity of the reservoir itself and of the surrounding shale units. In the Tertiary of the Beaufort-Mackenzie basin, naphthenic oils and condensates have been generated from terrestrially derived organic matter in source rocks juxtaposed with the reservoir at reflectance levels of 0.4 to 0.6%Ro. However, condensates discovered in reservoirs which are th rmally immature on the Labrador Shelf have undergone extensive vertical migration and can be classed as conventional mature to overmature condensates. Hydrocarbons discovered in the Lower Cretaceous of the Beaufort-Mackenzie basin and also those of the Scotian Shelf are more or less in place in that they are at a level of thermal alteration about equivalent to that of the reservoirs in which they are trapped. The source for the early oils and condensates is considered to be resinite occurring dispersed in coal fragments. The proportion of resinite, liptinite, and vitrinite in the organic matter of terrestrial source rocks strongly controls both the level of thermal alteration necessary for the section to function as an effective source rock and the ultimate product (gas, oil, or condensate) which will be generated.