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为了认识华庆地区长8油层组原油成藏过程,首次应用含氮化合物组成,结合该油层组剩余压力和流体包裹体特征,研究了原油充注点和运移方向、原油充注的动力特征、期次和时间,认为华庆地区长8油层组原油中咔唑类化合物的运移分馏效应显著,储层包裹体均一温度分布特征反映原油经历了3次运移期和充注期.研究结果表明:在横向上,原油样品中咔唑类化合物的绝对含量由南向北和由东向西减小,而咔唑类化合物异构体比值则由南向北和由东向西增加,反映了长8原油具有2个充注点和运移方向,即从研究区南部和东部充注,向北部和西部方向运移;在纵向上,从长7至长8、长10油层组,咔唑类化合物的绝对含量逐渐减小,而咔唑类化合物异构体比值则逐渐增大,反映了原油由上向下运移,即从长7油层组向长8运移.华庆地区长8原油这种充注点和运移方向与长7油层组和长8油层组之间的剩余压力差以及长8油层组剩余压力分布特征相一致.储层包裹体均一温度分布表现为3个显著的主峰温度,即80℃,100℃和120~130℃.根据盆地埋藏史和热史,推测原油注入长8储集层的地质时间为侏罗世末期-早白垩世晚期.
In order to understand the formation process of crude oil in Chang-8 reservoir in Huaqing area, the composition of nitrogen compounds and the characteristics of fluid inclusions in this reservoir are studied for the first time. The charging points and migration directions of crude oil, the dynamic characteristics of crude oil charge , Period and time, the migration and fractionation of carbazole compounds in crude oil of Chang 8 reservoir in Huaqing area is significant, and the homogenization temperature distribution of reservoir inclusions reflects that crude oil has undergone three migration and filling periods. The results show that in the transverse direction, the absolute content of carbazole compounds decreases from south to north and from east to west, while the ratio of carbazole isomers increases from south to north and from east to west. It reflects that Chang 8 oil has two filling points and migration directions, that is, filling from the south and east of the study area and migrating to the north and west direction. In the longitudinal direction, from Chang 7 to Chang 8 and Chang 10 oil layers, The absolute content of carbazole compounds decreases gradually, but the ratio of carbazole isomers gradually increases, which reflects the migration of crude oil from top to bottom, that is, from Chang 7 oil layer to Chang 8. This charge point and migration direction of Chang 8 crude oil and long 7 reservoir group and long 8 The residual pressure difference between layers is consistent with the residual pressure distribution characteristics of the Chang 8 reservoir.The homogenization temperature distribution of the reservoir inclusions shows three significant main peak temperatures of 80 ℃, 100 ℃ and 120 ~ 130 ℃ .According to the basin Burial history and thermal history, it is speculated that the geological time for oil injection into the Chang 8 reservoir is from the Late Jurassic to Early Cretaceous.