Possible application of bicyclic sesquiterpanes to evaluate the thermal maturity of oils. A study of Kamchatka and Chukotka oils from Cenozoic deposits, Russia

IF 2.6 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Organic Geochemistry Pub Date : 2023-12-15 DOI:10.1016/j.orggeochem.2023.104717

Irina Konopleva

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Abstract

The distribution of bicyclic sesquiterpanes in crude oils was studied to assess the applicability of the sesquiterpane ratios as maturity parameters. GC–MS analysis was conducted on ten oil samples that were generated in Miocene-Paleogene deposits located within the Kamchatka Peninsula and southeast Chukotka, the Russian Far East. During catagenesis, there is a shift in the distribution of sesquiterpanes with increasing thermal maturity, e.g., a decrease of the relative content of C₁₆ homodrimanes towards an increase of C₁₅ drimanes and C₁₄ sesquiterpanes. New maturity indices, based on sesquiterpanes, correlate well with commonly used maturity indicators, such as a methylphenanthrene index (MPI-1) and a methyldibenzothiophene ratio (MDR) (the R² value greater than 0.746). Since C₁₄ sesquiterpanes can arise as a product of thermolysis of higher homologues or may be derived from other organic sources, it is not included in one of the new indices.

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应用双环倍半萜评估油类热成熟度的可能性。对俄罗斯堪察加半岛和楚科奇半岛新生代矿床油类的研究

研究了双环倍半萜在原油中的分布，评价了倍半萜比值作为成熟度参数的适用性。对俄罗斯远东堪察加半岛和楚科奇东南部中新世-古近纪沉积的10个油样进行了气相色谱-质谱分析。在变质过程中，随着热成熟度的增加，倍半萜烯的分布发生了变化，即C16同萜类化合物的相对含量减少，而C15萜类和C14倍半萜烯的相对含量增加。基于倍半萜的新成熟度指标与常用成熟度指标，如甲基菲指数(MPI-1)和甲基二苯并噻吩比(MDR)具有良好的相关性(R2值大于0.746)。由于C14倍半萜可以作为高级同系物的热裂解产物产生，也可以来自其他有机来源，因此它不包括在一个新的指数中。

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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.