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凝析油普遍具有成熟度高、甾萜类生物标志化合物浓度低、非烃馏分含量低等特点,常用的甾萜类生物标志物和咔唑类含氮化合物相关的示踪参数在凝析油藏充注途径研究中受到了限制.基于硫原子氢键形成机理,原油中的烷基二苯并噻吩类化合物(DBTs)在运移过程中产生分馏效应,与咔唑类含氮化合物类似,随着运移距离增加,其绝对含量逐渐降低,所以石油中DBTs总量降低的方向可以指示石油运移方向和油藏充注途径.本文以氘原子取代的二苯并噻吩为标样,获得原油中DBTs的总量,除少数非烃馏分含量极低的样品外,该值与咔唑类含氮化合物总量具有良好的正相关性.与咔唑类含氮化合物总量相比,该参数在凝析油藏充注途径研究中更优越,它弥补了凝析油中咔唑类含氮化合物含量低,分离和定量不准确而导致参数值误差较大的缺点.以北部湾盆地福山凹陷花场凝析油藏为实例的示踪结果表明,DBTs总量可以有效地示踪凝析油藏充注途径,结合4-/1-甲基二苯并噻吩、2,4-/1,4-二甲基二苯并噻吩和4,6-/1,4-二甲基二苯并噻吩等示踪参数,确定福山凹陷花场凝析油藏的运移方向和充注途径为:沿北东到南西方向往花场凸起充注成藏,推测其烃源灶是位于其北东方向的白莲次凹.结果初步表明DBTs总量是示踪凝析油藏充注途径的有效参数.
Condensate generally has the characteristics of high maturity, low concentration of steroid biomarkers, and low content of non-hydrocarbon fractions. Tracer parameters related to commonly used steroid biomarkers and carbazole nitrogen compounds are found in condensate Because of the hydrogen bond formation mechanism of sulfur atoms, the alkyl dibenzothiophenes (DBTs) in the crude oil have a fractional distillation effect during the transport process. Similar to the carbazole nitrogenous compounds, As the migration distance increases, the absolute content decreases gradually, so the direction of the decrease of total DBTs in petroleum can indicate the migration direction of oil and the way of reservoir filling.In this paper, deuterium-substituted dibenzothiophene The total amount of DBTs in crude oil, except for a few samples with very low non-hydrocarbon fractions, had a good positive correlation with the total amount of carbazole-containing nitrogen compounds The parameter is more superior in the research of filling reservoir of condensate reservoirs, which makes up for the shortcoming of low content of carbazole nitrogen compounds in condensate oil, inaccuracy of separation and quantification, Depression flower field condensate The results of the tracing experiments show that the total amount of DBTs can effectively trace the charge of condensate reservoir, combined with 4- / 1-methyl dibenzothiophene, 2,4- / 1,4-dimethyl-di Benzothiophene and 4,6- / 1,4-dimethyl dibenzothiophene and other tracing parameters to determine Fuyun Sag Huachang condensate reservoir migration direction and filling approach: along the north east to the southwest It is estimated that the hydrocarbon source pool is bailian subfacies located in the northeast direction of the flower field.The result shows that the total amount of DBTs is a valid parameter of the filling method of tracer condensate reservoir.