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咔唑类化合物是原油中极性较大的化合物,是研究油气运移的有效指标。在油气运移过程中,咔唑类与围岩发生作用而被吸附;苯并[a]咔唑比苯并[c]咔唑运移速度快;C3-咔唑的极性相对于C2-咔唑的较小而运移较快。因此,随运移距离增大,原油中的咔唑类化合物的含量将不断减少,苯并[a]咔唑/苯并[c]咔唑比值增大,C2-咔唑/C3-咔唑比值变小。塔里木盆地的第二期油气成藏发生在海西晚期,阿瓦提凹陷在海西期不断沉降,为塔里木盆地主要的生油凹陷,寒武系—下奥陶统源岩此时处于大量排烃期,根据上述几项含氮化合物指标的研究可知,排出的油气从生烃中心向四周呈辐射状运移,在构造高部位聚集成藏,晚海西期运动时被抬升至地表形成现今广泛分布的干沥青。
Carbazole compounds are the more polar compounds in crude oil and are effective indicators for the study of hydrocarbon migration. In the process of hydrocarbon migration, the carbazoles are adsorbed by the surrounding rock; the benz [a] carbazole migrates faster than the benzo [c] carbazole; the polarity of the C3-carbazole is higher than that of the C2- Carbazoles are smaller and migrate faster. Therefore, with the increase of migration distance, the content of carbazole compounds in crude oil will decrease, the ratio of carbazole / benzo [c] carbazole increases, and the ratio of C2-carbazole / The ratio becomes smaller. The second phase of hydrocarbon accumulation in the Tarim Basin took place in the late Hercynian period. The Awati depression continued to settle in the Hercynian period, which is the main oil-producing depression in the Tarim Basin. At this time, the Cambrian-Lower Ordovician source rock was in a large period of hydrocarbon expulsion Based on the above studies of several nitrogen-containing compounds, the discharged hydrocarbons migrated radially from the hydrocarbon generation center to the periphery and gathered in the high tectonic positions. During the Late Hercynian movement, they were lifted up to the surface to form a wide distribution Dry asphalt.