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Thermal alteration of biomarkers in the presence of elemental sulfur and sulfur-bearing minerals during hydrous and anhydrous pyrolysis
Organic Geochemistry ( IF 2.6 ) Pub Date : 2018-09-01 , DOI: 10.1016/j.orggeochem.2018.06.010
Liangliang Wu , Xinyan Fang , Shuhuan Ji , Ansong Geng

Abstract Although elemental sulfur and sulfur-bearing minerals are not the main constituents of sedimentary rock, they are still important for the formation and destruction of biomarkers. In this study, a bitumen of Sichuan Basin mudstone with abundant biomarkers was separately pyrolyzed (under both hydrous and anhydrous conditions) with elemental sulfur (S0) and sulfur-bearing minerals (including pyrite, ferrous sulfate, and ferric sulfate) at various temperatures (300, 330 and 350 °C). The results show that the effects of different forms of sulfur on the evolution of biomarkers vary. Pyrite (FeS2) had only a slight influence on the characteristics of the biomarkers during anhydrous and hydrous pyrolysis. On the other hand, the presence of S0, ferrous sulfate (FeSO4) and ferric sulfate (Fe2(SO4)3) promoted the thermal cracking of the biomarkers and changed the biomarker distributions under anhydrous conditions. The extent of biomarker thermal alterations decreased in the following order: S0 > Fe2(SO4)3 > FeSO4 > FeS2. Additionally, the presence of water seemed to promote the effects of the sulfur additive on the changes in biomarker compositions, but this did not change their raking in terms of influence. The elemental sulfur alteration of the biomarkers increased with pyrolysis temperature (simulated maturity) and the abundance of elemental sulfur in the sample. The results obtained offer new insights into how biomarkers evolve when elemental sulfur and sulfur-bearing minerals are present.

中文翻译:

在含水和无水热解过程中存在元素硫和含硫矿物时生物标志物的热变化

摘要 元素硫和含硫矿物虽然不是沉积岩的主要成分,但对于生物标志物的形成和破坏仍然具有重要意义。在这项研究中,具有丰富生物标志物的四川盆地泥岩沥青在不同温度下分别与元素硫(S0)和含硫矿物(包括黄铁矿、硫酸亚铁和硫酸铁)热解(在含水和无水条件下)( 300、330 和 350 °C)。结果表明,不同形式的硫对生物标志物演化的影响各不相同。在无水和含水热解过程中,黄铁矿 (FeS2) 对生物标志物的特性仅有轻微影响。另一方面,S0 的存在,硫酸亚铁 (FeSO4) 和硫酸铁 (Fe2(SO4)3) 促进了生物标志物的热裂解,并在无水条件下改变了生物标志物的分布。生物标志物热变化的程度按以下顺序降低:S0 > Fe2(SO4)3 > FeSO4 > FeS2。此外,水的存在似乎促进了硫添加剂对生物标志物组成变化的影响,但这并没有改变它们的影响范围。生物标志物的元素硫改变随着热解温度(模拟成熟度)和样品中元素硫的丰度而增加。获得的结果为了解当元素硫和含硫矿物存在时生物标志物如何演变提供了新的见解。生物标志物热变化的程度按以下顺序降低:S0 > Fe2(SO4)3 > FeSO4 > FeS2。此外,水的存在似乎促进了硫添加剂对生物标志物组成变化的影响,但这并没有改变它们的影响范围。生物标志物的元素硫改变随着热解温度(模拟成熟度)和样品中元素硫的丰度而增加。获得的结果为了解当元素硫和含硫矿物存在时生物标志物如何演变提供了新的见解。生物标志物热变化的程度按以下顺序降低:S0 > Fe2(SO4)3 > FeSO4 > FeS2。此外,水的存在似乎促进了硫添加剂对生物标志物组成变化的影响,但这并没有改变它们的影响范围。生物标志物的元素硫改变随着热解温度(模拟成熟度)和样品中元素硫的丰度而增加。获得的结果为了解当元素硫和含硫矿物存在时生物标志物如何演变提供了新的见解。但这并没有改变他们的影响力。生物标志物的元素硫改变随着热解温度(模拟成熟度)和样品中元素硫的丰度而增加。获得的结果为了解当元素硫和含硫矿物存在时生物标志物如何演变提供了新的见解。但这并没有改变他们的影响力。生物标志物的元素硫改变随着热解温度(模拟成熟度)和样品中元素硫的丰度而增加。获得的结果为了解当元素硫和含硫矿物存在时生物标志物如何演变提供了新的见解。
更新日期:2018-09-01
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