南海珠江口西部盆地复杂含油气系统中原油驱动骨架化合物含量和组成的控制因素及地质应用

IF 2.6 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Organic Geochemistry Pub Date : 2025-02-01 DOI:10.1016/j.orggeochem.2024.104925

Peng Cheng , Yuhao Ren , Haifeng Gai , Shangli Liu , Tao Cheng , Hui Tian

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引用次数: 0

摘要

原油通常含有驱动烃骨架化合物，但控制驱动烃分布的主要因素的不确定性限制了它们的有效地质应用，特别是在复杂的石油系统中。本研究系统研究了南海珠江口西部盆地不同构造区原油的驱动骨架化合物组成及其与C30藿烷（CDSC）的相对含量。结果表明，原油的CDSC主要受其有机来源控制。原油中CDSC值越高，表明陆源有机质对烃源岩的贡献越大。对于生物输入相似的烃源岩原油，CDSC值主要受沉积环境控制。原油中较高的CDSC值对应于较高的粘土矿物浓度和较低的盐度。此外，原油的驱动骨架化合物组成在很大程度上受其成熟度的控制。随着成熟度的增加，驱动烷与同驱动烷的比值（Dr/HDr）、总重排驱动烷与总驱动烷和同驱动烷的比值（TRDr/TDr）、8重排驱动烷与9重排驱动烷的比值（8RDr/9RDr）同步增加。这些比值可以有效地表征不同类型原油的成熟度。驱动型成熟度参数所表征的期限范围大于常规成熟度参数所表征的期限范围。基于动力参数和其他有机地球化学参数的对比图可以对原油进行分类，揭示其来源和成因，在复杂含油气盆地，特别是在富含轻质油/凝析油的深层和超深层含油气系统中具有很大的应用潜力。

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Controlling factors and geological applications of the drimane-skeleton compound content and composition of crude oils in complex petroleum systems: New insights from the Western Pearl River Mouth Basin, South China Sea

Crude oils generally contain drimane-skeleton compounds, but the uncertainty of the main factors controlling drimane distributions limits their effective geological applications, especially in complex petroleum systems. In this study, the drimane-skeleton compound composition and the relative content of each drimane-skeleton compound to C₃₀ hopane (C_DSC) were systematically studied for crude oils in different structural regions of the Western Pearl River Mouth (WPRM) Basin, South China Sea. The results show that the C_DSC of crude oil is mainly controlled by its organic sources. Higher C_DSC values in crude oil indicates a greater contribution from terrigenous organic matter to their source rocks. For crude oils from source rocks with similar biotic inputs, the C_DSC values are controlled mainly by the depositional environment. Higher C_DSC values in crude oil correspond to higher concentrations of clay minerals and lower salinities. In addition, the drimane-skeleton compound composition of crude oil is largely controlled by its maturity. The ratios of drimane to homodrimane (Dr/HDr), total rearranged drimane to total drimane and homodrimane (TRDr/TDr), and 8-rearranged drimane to 9-rearranged drimane (8RDr/9RDr) synchronously increase with increasing maturity. These ratios can effectively characterize the maturity of various types of crude oils. The maturity range characterized by the drimane maturity parameters is greater than that characterized by conventional maturity parameters. Correlation diagrams based on drimane parameters and other organic geochemical parameters can be used to classify crude oils and reveal their sources and origins, which has great application potential in complex petroliferous basins, especially in deep and ultra-deep petroleum systems with abundant light oil/condensate.

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来源期刊

Organic Geochemistry 地学-地球化学与地球物理

CiteScore

5.50

自引率

6.70%

发文量

100

审稿时长

61 days

期刊介绍： Organic Geochemistry serves as the only dedicated medium for the publication of peer-reviewed research on all phases of geochemistry in which organic compounds play a major role. The Editors welcome contributions covering a wide spectrum of subjects in the geosciences broadly based on organic chemistry (including molecular and isotopic geochemistry), and involving geology, biogeochemistry, environmental geochemistry, chemical oceanography and hydrology. The scope of the journal includes research involving petroleum (including natural gas), coal, organic matter in the aqueous environment and recent sediments, organic-rich rocks and soils and the role of organics in the geochemical cycling of the elements. Sedimentological, paleontological and organic petrographic studies will also be considered for publication, provided that they are geochemically oriented. Papers cover the full range of research activities in organic geochemistry, and include comprehensive review articles, technical communications, discussion/reply correspondence and short technical notes. Peer-reviews organised through three Chief Editors and a staff of Associate Editors, are conducted by well known, respected scientists from academia, government and industry. The journal also publishes reviews of books, announcements of important conferences and meetings and other matters of direct interest to the organic geochemical community.