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南海神狐海域水合物储层沉积物中有机质的地球化学特征及意义。

Geochemical Characteristics and Significance of Organic Matter in Hydrate-Bearing Sediments from Shenhu Area, South China Sea.

机构信息

College of Engineering, Peking University, Beijing 100871, China.

Beijing International Center for Gas Hydrate, School of Earth and Space Sciences, Peking University, Beijing 100871, China.

出版信息

Molecules. 2022 Apr 14;27(8):2533. doi: 10.3390/molecules27082533.

DOI:10.3390/molecules27082533
PMID:35458729
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9025314/
Abstract

Rock-Eval pyrolysis and the biomarker composition of organic matter were systematically studied in hydrate-bearing sediments from the Shenhu area, South China Sea. The n-alkane distribution patterns revealed that the organic matter in the sediments appeared to originate from mixed sources of marine autochthonous input, terrestrial higher plants, and ancient reworked organic matter. The low total organic carbon contents (average < 0.5%) and the low hydrogen index (HI, <80 mg HC/g TOC) suggested the poor hydrocarbon-generation potential of the deposited organic matter at a surrounding temperature of <20 °C in unconsolidated sediments. The abnormally high production index and the fossil-originated unresolved complex mixture (UCM) accompanied by sterane and hopane of high maturity indicated the contribution of deep hydrocarbon reservoirs. Preliminary oil-to-source correlation for the extracts implied that the allochthonous hydrocarbons in the W01B and W02B sediments might have originated from the terrestrial source rocks of mature Enping and Wenchang formations, while those of W03B seem to be derived from more reduced and immature marine source rocks such as the Zhuhai formation. The results of the organic extracts supported the previous identification of source rocks based on the isotopic composition of C2+ hydrate-bound gases. The biomarker of methanogens, squalane, was recognized in the sediments of this study, possibly suggesting the generation of secondary microbial gases which are coupled with the biodegradation of the deep allochthonous hydrocarbons.

摘要

对南海神狐海域水合物赋存沉积物进行了岩石热解和有机质生物标志物组成的系统研究。正构烷烃分布模式表明，沉积物中的有机质似乎来源于海洋自生输入、陆地高等植物和古老再循环有机质的混合源。低总有机碳含量（平均<0.5%）和低氢指数（HI，<80mg HC/g TOC）表明，在<20°C的周围温度下，未固结沉积物中沉积有机质的生烃潜力较差。异常高的产率指数和源自化石的未解复杂混合物（UCM）以及高成熟甾烷和藿烷表明深部烃源层的贡献。提取物的初步油源对比表明，W01B 和 W02B 沉积物中的外源烃可能源自成熟恩平组和文昌组的陆源岩，而 W03B 的则可能源自更还原和不成熟的海洋源岩，如珠海组。有机提取物的结果支持了先前基于 C2+水合物结合气体同位素组成对烃源岩的识别。本研究沉积物中识别出了产甲烷菌生物标志物 squalane，可能表明次生微生物气体的生成与深部外源烃的生物降解有关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/9235627082d7/molecules-27-02533-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/cdb6ebe9aa70/molecules-27-02533-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/8f54b9a4fe35/molecules-27-02533-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/b3f40949ff7b/molecules-27-02533-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/0a2b69096080/molecules-27-02533-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/b624d5d7e226/molecules-27-02533-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/39033c26f504/molecules-27-02533-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/9bf2191a5cfb/molecules-27-02533-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/3585aed6c6c5/molecules-27-02533-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/9235627082d7/molecules-27-02533-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/cdb6ebe9aa70/molecules-27-02533-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/8f54b9a4fe35/molecules-27-02533-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/b3f40949ff7b/molecules-27-02533-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/0a2b69096080/molecules-27-02533-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/b624d5d7e226/molecules-27-02533-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/39033c26f504/molecules-27-02533-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/9bf2191a5cfb/molecules-27-02533-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/3585aed6c6c5/molecules-27-02533-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773c/9025314/9235627082d7/molecules-27-02533-g009.jpg

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