三塘湖盆地马芦1井芦草沟组烃源岩中 类胡萝卜烷系列化合物的检出及其地质意义
- 收稿日期:
2023-07-20
- 网络出版日期:
2024-04-09
摘要: 【目的】γ-和β-胡萝卜烷属于类胡萝卜烷,广泛分布于沉积物和原油中,但是低碳数的类胡萝卜烷系列化合物在烃源岩中较为少见,本次研究旨在探讨γ-和β-胡萝卜烷以及低碳数类胡萝卜烷系列化合物的来源及其在地质载体中的意义。【方法】基于三塘湖盆地马朗凹陷马芦1井芦草沟组12件代表性烃源岩样品,通过气相色谱-质谱、岩石热解、镜质体反射率、总有机碳(TOC)分析,详细表征其地球化学特征,以此获得目标化合物的生源信息。【结果】马芦1井芦草沟组烃源岩有机质丰度高、类型好、处于成熟阶段,并且这些烃源岩样品中富含γ-和β-胡萝卜烷以及低碳数(碳数范围为C13-C25)的类胡萝卜烷系列化合物。本次研究根据正构烷烃、萜烷、甾烷等系列生物标志化合物的分布特征,并综合分析了其它地球化学参数,认为γ-和β-胡萝卜烷主要来源于细菌。此外,结合烃源岩热演化、微生物化石及火山爆发的证据,本次研究还提出低碳数类胡萝卜烷系列化合物可能是γ-和β-胡萝卜烷受微生物或热演化作用的产物,该研究可以为烃源岩的探索提供新的思路。
Detection and Geological Significance of Carotenoid-derived alkanes in the Source Rocks from the well Malu 1 , lucaogou Formation, Santanghu Basin
- Received Date:
2023-07-20
- Available Online:
2024-04-09
Abstract: [Objective] γ-carotane and β-carotane belong to carotenoid-derived alkanes, which are widely distributed in sediments and crude oil, but carotenoid-derived alkanes with low carbon number are rare in the study of source rocks. The purpose of this study is to explore the sources of γ-carotane,β-carotane and carotenoid-derived alkanes with low carbon number, indicating significance in geological carriers. [Methods] 12 representative source rock samples are from the well Malu1 in the Lucaogou Formation of the Malang Sag,and Santanghu Basin were collected. The geochemical characteristics were demonstrated in detail by Gas Chromatography-Mass Spectrometry, Rock Pyrolysis, Vitrinite Reflectance (Ro) and Total Organic Carbon (TOC) analysis, so as to obtain the biogenic information of the target compound. [Results] The source rocks of Lucaogou Formation from the Well Malu 1 are rich in organic matter, good in type and in mature stage.Moreover ,the source rocks are rich in γ- and β-carotane with high abundance and have carotenoid-derived alkanes with low carbon number (Carbon number ranges from C13 to C25). Based on the comprehensive analysis of the distribution characteristics of a series of biomarkers such as n-alkanes, terpanes and steranes and other geochemical parameters, it is considered that bacteria may be the main biological precursors of γ- and β-carotane. In addition, combining the evidence of thermal evolution of hydrocarbon source rocks, microbial fossils and volcanic eruptions, the present study also proposes that the carotenoid-derived alkanes with low carbon number may be the products of γ- and β-carotane affected by microorganisms or thermal evolution.This study can provide new ideas for the exploration of source rocks.
符印, 王作栋, 张婷, 李晓斌, 王文军, 王志勇. 三塘湖盆地马芦1井芦草沟组烃源岩中 类胡萝卜烷系列化合物的检出及其地质意义[J]. 沉积学报. doi: 10.14027/j.issn.1000-0550.2024.013
Detection and Geological Significance of Carotenoid-derived alkanes in the Source Rocks from the well Malu 1 , lucaogou Formation, Santanghu Basin[J]. Acta Sedimentologica Sinica. doi: 10.14027/j.issn.1000-0550.2024.013
Citation: |
Detection and Geological Significance of Carotenoid-derived alkanes in the Source Rocks from the well Malu 1 , lucaogou Formation, Santanghu Basin[J]. Acta Sedimentologica Sinica. doi: 10.14027/j.issn.1000-0550.2024.013
|