Source rock palaeoenvironments and controls on the distribution of dibenzothiophenes in lacustrine crude oils, Bohai Bay Basin, eastern China
Source rock palaeoenvironments and controls on the distribution of dibenzothiophenes in lacustrine crude oils, Bohai Bay Basin, eastern China
复制标题
DOI：
10.1016/s0146-6380(99)00126-6
复制
发表时间：
1999-01-01
影响因子：
3
通讯作者：
Pearson, MJ
中科院分区：
文献类型：
--
作者：
Huang, HP;Pearson, MJ
基于二苯并噻吩（DBT）及其烷基同系物的比率的含硫芳烃参数作为石油成熟度指标的适用性，在渤海湾盆地大民屯凹陷和沾化凹陷的27种石油中进行了研究。这些石油通过总体组成和对环境敏感的脂肪族生物标志物进行了表征，它们来源于广泛的湖相烃源岩沉积环境，从高度还原的高盐度（富硫石油）到以陆源输入为主的淡水（高蜡石油），成熟度从未成熟到可能的中等成熟不等。基于二苯并噻吩的成熟度参数与甾烷异构化比率相关性不佳，特别是未成熟石油无法通过这些芳烃成熟度指标进行区分。相比之下，基于DBT的参数与姥鲛烷/植烷以及Ts/Tm比率有很强的相关性。高甲基二苯并噻吩比率（MDR）与淡水烃源岩沉积有关，而低MDR则出现在具有高盐度烃源岩亲缘性的石油中。在一些被推断来源于湖相有机纹层的未成熟石油中，观察到2 + 3 - MDBT的相对浓度异常高。这些数据进一步证明，热应力不是控制石油中二苯并噻吩分布模式的唯一因素，当烃源岩沉积环境的变化范围较大时，它可以产生主导影响。一些生物降解石油中没有DBT，初步归因于在相关水洗过程中它的水溶性。（C）1999年爱思唯尔科学有限公司。保留所有权利。
The applicability of sulphur aromatic parameters, based on ratios of dibenzothiophene (DBT) and its alkylated homologues, as indicators of oil maturity has been investigated in 27 oils from the Damintun and Zhuanhua Depressions, Bohai Bay Basin. The oils were characterised by bulk composition and environmentally-sensitive aliphatic biomarkers and were derived from a wide range of lacustrine source depositional environments ranging from highly reducing hypersaline (sulphur-rich oils) to terrestrial input-dominated freshwater (very high wax oils) with maturities ranging from immature to probable mid-mature. Dibenzothiophene-based maturity parameters are not well-correlated with sterane isomerization ratios, and immature oils, in particular, could not be discriminated by these aromatic maturity indicators. In contrast, DBT-based parameters are strongly-correlated with pristane to phytane and Ts/Tm ratios. High methyldibenzothiophene ratios (MDR) are associated with fresh water source deposition whilst low MDRs are found in oils of hypersaline source affinity. Unusually high relative concentrations of 2 + 3-MDBT were observed in some of the immature oils inferred to be sourced by lacustrine organic laminites. The data provide further evidence that thermal stress is not the sole factor controlling the distribution patterns of dibenzothiophenes in oils and that source depositional environments can exert a dominant influence when their range of variation is large. Absence of DBT in some biodegraded oils is tentatively attributed to its aqueous solubility during associated water washing. (C) 1999 Elsevier Science Ltd. All rights reserved.