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首页> 外文期刊>Marine and Petroleum Geology >Biomarker signatures of the Ediacaran-Early Cambrian origin petroleum from the central Sichuan Basin, South China: Implications for source rock characteristics
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Biomarker signatures of the Ediacaran-Early Cambrian origin petroleum from the central Sichuan Basin, South China: Implications for source rock characteristics

机译：伊德拉甘初期寒武纪的生物标志物签名来自四川盆地中部南方河南省河北省河北省河北省的石油：源岩特征的影响

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摘要

Hydrocarbons with an Ediacaran-Early Cambrian origin from the central Sichuan Basin, South China were investigated for biomarker compositions. They were obtained by solvent extraction from the Upper Ediacaran reservoir core samples, which contain abundant solid bitumen. The solid bitumen is widely believed to be formed by thermal cracking of early-charged oils in the reservoirs, which have presumed source rocks of an Ediacaran-Early Cambrian age. Thermal maturity parameters based on phenanthrenes and aromatic steroids suggest a very high thermal maturity for the extracted hydrocarbons, which is consistent with the severe maturation undergone by their host reservoirs. Age-diagnostic biomarkers including C-30 24-isopropylcholestanes and mid-chain monomethyl alkalies support source rocks of an Ediacaran-Early Cambrian age. The extracted hydrocarbons have very similar biomarker signatures, which include high relative abundance of acyclic isoprenoids and pristane/phytane 1; high abundance of 2a-methylhopanes; high abundance of C-27 to C-29 steranes with a slight preference for either C-27 or C-29 homologues; high relative abundance of diasteranes; the concomitant presence of 24-n-propyl and 24-isopropylcholestanes and 24-isopropy 1/2 4-n-propylcholestanes 1; and the presence of C-26 norcholestanes, methyl- and ethyisteranes. The presence of hopanoids including extended series and methylhopanes indicates contributions from prokaryotic bacteria while the presence of various steroids including regular steranes and methylsteranes indicates contributions from the eukaryotic algae. Parameters based on tricyclic terpane and hopane, dibenzothiophene/phenanthrene ratios, and C-27 diasteranes/ (diasteranes + regular steranes) ratios suggest a major shale source, but a mixed shale-carbonate source cannot be completely excluded. Presence of C-30 demethylsteranes, low pristane/phytane ratios, high gammacerane index, and presence of 28,30-dinorhopane and 2-methyhopanes indicate that the source rocks were deposited in a stratified, anoxic marine depositional environment with enhanced salinity conditions.
机译：碳氢化合物与伊德拉班早期寒武纪起源的碳氢化合物被研究为生物标志物组合物。它们是通过从上埃德拉兰储层核心样品中的溶剂萃取而获得，该储层含有丰富的固体沥青。众所周知，固体沥青被广泛被储存器中早期充电油的热破裂形成，这引起了埃德拉甘早期寒武纪时代的推定来源岩。基于菲苯树和芳族类固醇的热成熟度参数表明提取的烃的热成熟度非常高，这与其主机储存器的严重成熟经过一致。年龄诊断生物标志物，包括C-30 24-异丙基胆烷和中链单甲基碱支持埃德拉甘早期寒武纪时代的源岩。提取的烃具有非常相似的生物标志物签名，其包括高相对丰度的无循环异戊二烯和血糖/植物＆ 1;高丰度的2A-甲基烷;高丰盈的C-27至C-29甾体，略微偏好C-27或C-29同源物;高相对丰富的侨民;伴随的24-正丙基和24-异丙基胆糖烷和24-异丙基1/2 4-N-丙基胆糖烷＆GT; 1;和C-26诺谢斯坦，甲基和乙基人的存在。潜水蛋白的存在包括扩展系列和甲基烷，表明了原核细菌的贡献，而各种类固醇的存在，包括常规的甾体常规和甲基甲烷表明来自真核藻类的贡献。基于三环萜状物和血糖，二苯甲酸酚酚/菲比的参数，以及C-27羚羊/（侨民+常规甾体）比率表明了一个主要的页岩来源，但不能完全排除混合的页岩碳酸盐源。 C-30去甲基烷基斯，低血丙烷率，高γ甲烷指数和28,30-二甲丙烷和2-甲烷的存在表明，源岩沉积在具有增强的盐度条件下的分层的缺氧船舶沉积环境中。

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