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On the basis of the results of simulation experiments, now we better understand the contribution of high carbon number hydrocarbons to diamondoid generation during thermal pyrolysis of crude oil and its sub-fractions (saturated, aromatic, resin, and asphalene fractions). However, little is known about the effect of volatile components in oil on diamondoid generation and diamondoid indices due to the lack of attention to these components in experiments. In this study, the effect of volatile components in oil on diamondoid generation and maturity indices was investigated by the pyrolysis simulation experiments on a normal crude oil from the HD23 well of the Tarim Basin and its residual oil after artificial volatilization, combined with quantitative analysis of diamondoids. The results indicate that the volatile components (≤ nC) in oil have an obvious contribution to the generation of adamantanes, which occurs mainly in the early stage of oil cracking (Easy R<1.0%), and influences the variations in maturity indices of adamantanes; but they have no obvious effect on the generation and maturity indices of diamantanes. Therefore, some secondary alterations e.g., migration, gas washing, and biodegradation, which may result in the loss of light hydrocarbons in oil under actual geological conditions, could affect the identification of adamantanes generated during the late-stage cracking of crude oil, and further influence the practical application of adamantane indices. [ABSTRACT FROM AUTHOR]

Branched glycerol dialkyl glycerol tetraethers (brGDGTs), likely produced by bacteria in soil and peat, are widely distributed, easily detected, newly adopted biomarker compounds. In this study, brGDGTs were used to explore the relationship between the absolute abundance of brGDGTs and the distribution of oil and gas fields in the Duoshiqiao area of the Jiyang depression. The results showed that the concentrations at the Xiakou fault and in the oil and gas fields were obviously higher than those in the contrast areas. The clear relationship among the concentration of brGDGTs, the distribution of oil and gas fields, and the acidolysis hydrocarbon (ethane) indicates that the concentration effectively responds to hydrocarbon seeps from the oil and gas field below. brGDGTs may become some of the most important indicators in surface geochemical prospecting for oil and gas. [ABSTRACT FROM AUTHOR]