利用苯并萘硫噻吩追踪四川盆地中部埃迪卡拉-寒武纪储层的古石油迁移方向

IF 3.1 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2024-09-26 DOI:10.1016/j.apgeochem.2024.106189

Zhi Chai , Zhonghong Chen , Moïse Luemba

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引用次数: 0

摘要

苯并萘硫醚（BNTs）是石油中重要的有机硫化合物，其浓度和[2,1]/（[2,1] + [1,2]）BNT 比率已被用作迁移示踪剂。在此，我们重点研究 BNT 作为异常热变质古油藏迁移示踪剂的适用性。为此，我们采集了四川盆地中部埃迪卡拉纪至寒武纪白云岩储层中的 57 个热沥青样品，并采用气相色谱-质谱法进行了检测。结果表明，所研究样品中的大多数热焙烧沥青具有高浓度的未取代多环芳烃（PAHs）、高氟蒽/PAHs、高芘/PAHs、高氟蒽/（氟蒽+芘）、高苯并氟蒽/（苯并氟蒽+苯并芘）以及由于异常加热改变而导致的未取代芳烃与甲基化芳烃比值高的特点。这些焦比妥具有高浓度的 BNTs，其三种异构体呈现出 [2,1] > [1,2] > [2,3]BNT 的模式。BNTs浓度与异常加热相关的多环芳烃浓度呈良好的正相关关系，而[2,1]/（[2,1]+ [1,2]）BNT比值与异常加热相关指数没有相关性，这表明古油藏的异常加热导致了BNTs的富集，但对[2,1]/（[2,1]+ [1,2]）BNT比值的影响有限。此外，[2,1]/（[2,1] + [1,2]）BNT 比率似乎不受角质类型和沉积环境的影响，但会随着源岩成熟度的提高而增加。因此，[2,1]/（[2,1]+[1,2]）BNT 仍是异常加热储层的有效迁移示踪剂。在研究区域，该比率被用作迁移示踪剂。结果表明，古石油主要从西凹陷向东隆起迁移，然后从西北向东南方向迁移，这与地质环境和勘探实践相一致，表明该参数适用于异常热变质油藏。

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Using benzonaphthothiophenes to trace paleo-oil migration directions in the Ediacaran-Cambrian reservoirs of the central Sichuan Basin

Benzonaphthothiophenes (BNTs) are important organosulfur compounds in oil, and their concentrations and [2,1]/([2,1] + [1,2])BNT ratio have been used as migration tracers. Here we focus on the applicability of BNTs as migration tracers for abnormally heat-altered paleo-oil reservoirs. For this purpose, 57 pyrobitumen samples from the Ediacaran to Cambrian dolomite reservoirs in the central Sichuan Basin were collected and detected by gas chromatography-mass spectrometry. The results showed that most pyrobitumens of the studied samples are characterized by high concentrations of unsubstituted polycyclic aromatic hydrocarbons (PAHs), high values of fluoranthene/PAHs, pyrene/PAHs, fluoranthene/(fluoranthene + pyrene), benzofluoranthene/(benzofluoranthene + benzopyrene), and unsubstituted-to-methylated aromatic ratios due to the alteration by abnormal heating. These pyrobitumens have high concentrations of BNTs, and their three isomers show a pattern of [2,1] > [1,2] > [2,3]BNT. The BNTs concentrations display a good positive relationship with the concentrations of the abnormal heating-related PAH, while [2,1]/([2,1] + [1,2])BNT ratio has no correlation with the abnormal heating-related indices, suggesting that abnormal heating of the paleo-oil reservoirs lead to the enrichment of BNTs but has a limited effect on [2,1]/([2,1] + [1,2])BNT ratio. Moreover, [2,1]/([2,1] + [1,2])BNT ratio seem to be not affected by kerogen type and depositional environment, but increases with source rock maturity. Therefore, the [2,1]/([2,1]+[1,2])BNT is still an effective migration tracer for abnormally heated reservoirs. This ratio was applied as migration tracer in the studied area. The result suggests that the paleo-oil primarily migrated from west depression to east bulges, followed by the direction from northwest to southeast, which is congruent with the geological setting and exploration practice, demonstrating the applicability of this parameter for abnormally heat-altered oil reservoirs.

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.