Five series of benzohopanes in early Cretaceous sediments from the Chaoyang Basin, NE China

IF 2.6 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Organic Geochemistry Pub Date : 2024-08-01 DOI:10.1016/j.orggeochem.2024.104843

Lian Jiang , Li Li , Hans P. Nytoft , Yunpeng Wang , Simon C. George

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Abstract

Five series of benzohopanes were identified in a set of immature to early-oil-window early Cretaceous sediments from the ZK1006 well, Chaoyang Basin, NE China. Series a (C₃₁-C₃₅), b (C₃₃-C₃₅), and c (C₃₁-C₃₅) benzohopanes form by different pathways, while the newly-found series d (C₃₁-C₃₄, maybe to C₃₅?) and e (C₃₁-C₃₂, maybe to C₃₅?) benzohopanes have similar formation mechanisms. Series a is usually the predominant benzohopane series, but occasionally samples are dominated by series c benzohopanes. Series b benzohopanes may be associated with terrigenous organic matter. Series a and b benzohopanes are possibly influenced by redox properties, while paleosalinity more likely controls the formation and enrichment of series c benzohopanes. Two novel parameters (a benzohopane index, and the C₃₅/C₃₄ benzohopane ratio) are proposed to be useful paleoenvironmental proxies in the study area. A high benzohopane index and C₃₅/C₃₄ benzohopane ratio may indicate an anoxic environment.

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中国东北朝阳盆地早白垩世沉积物中的五系苯并噻吩类化合物

在中国东北朝阳盆地ZK1006井一套未成熟至早油窗早白垩世沉积物中发现了五个系列的苯并烃。系列 a（C-C）、b（C-C）和 c（C-C）苯并噻吩的形成途径不同，而新发现的系列 d（C-C，可能到 C?）和 e（C-C，可能到 C?）苯并噻吩的形成机制相似。a 系列通常是主要的苯并噻吩系列，但偶尔也会出现以 c 系列苯并噻吩为主的样品。系列 b 的苯并蹄花烷可能与土著有机物有关。系列 a 和 b 苯并ohopanes 可能受到氧化还原特性的影响，而古盐度更有可能控制系列 c 苯并ohopanes 的形成和富集。我们提出了两个新参数（苯并蹄烷指数和 C/C 苯并蹄烷比），作为研究区域有用的古环境代用指标。高苯并蹄烷烃指数和 C/C 苯并蹄烷烃比率可能预示着缺氧环境。

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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.