哈萨克斯坦ASK技术大学Madisheva, Rima Kopbosynkyzy的研究团队经过不懈努力，揭示了哈萨克斯坦南图尔盖盆地油气聚集带形成的地球化学条件。2023年12月14日出版的《地球化学学报》发表了这项成果。

该研究利用岩芯(热解)和石油(生物标志物和碳同位素组成)样品的地球化学分析数据，通过确定其环境条件来评估有机质的热成熟度和特征。根据热解得到的地球化学参数，大多数研究样品的原始岩石的生油潜力由贫到富不等。相成因有机质以腐殖质型为主，其次是腐殖质—腐泥型，表明研究样品中的有机质聚集处于中度还原条件(干酪根III型和干酪根II型)和海岸-海洋环境下(干酪根I型)。

源自Aryskum坳陷侏罗纪沉积物的石油的碳同位素组成也表明，有机质为腐泥型和腐殖—腐泥混合型(干酪根II型和干酪根I型)。石油的生物标志物分析表明，原始有机质形成于缺氧环境。

附：英文原文

Title: Geochemical prerequisites for the formation of oil and gas accumulation zones in the South Turgay basin, Kazakhstan

Author: Madisheva, Rima Kopbosynkyzy, Portnov, Vassiliy Sergeevich, Amangeldiyeva, Gulmadina Bulatovna, Demeuova, Akmaral Bakhytbekovna, Seitkhaziyev, Yessimkhan Sherekhanovich, Azhgaliev, Dulat Kalimovich

Issue&Volume: 2023-12-14

Abstract: This study predicts favorable oil and gas source-rock formation conditions in the Aryskum Depression of the South Turgay Basin, Kazakhstan. This study assesses the thermal maturity and characteristics of organic matter by determining its environmental conditions using data from geochemical analysis of core (pyrolysis) and oil (biomarkers and carbon isotopic compositions) samples. According to the geochemical parameters obtained by pyrolysis, the oil generation potential of the original rocks of most studied samples varies from poor to rich. The facies–genetic organic matter is predominantly humic and less frequently humus–sapropel, indicating organic matter accumulation in the studied samples were under moderately reducing conditions (kerogen III and II types) and coastal–marine environments (kerogen type I). The carbon isotopic compositions of oils derived from the Jurassic deposits of the Aryskum Depression also indicate the sapropelic and mixed humic–sapropelic type of organic matter (kerogen II and I). Biomarker analysis of oils indicates original organic matter formation in an anoxic environment.

DOI: 10.1007/s11631-023-00660-4

Source: https://link.springer.com/article/10.1007/s11631-023-00660-4