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

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Acta Geochimica Pub Date : 2023-12-14 DOI:10.1007/s11631-023-00660-4

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

{"title":"Geochemical prerequisites for the formation of oil and gas accumulation zones in the South Turgay basin, Kazakhstan","authors":"Rima Kopbosynkyzy Madisheva, Vassiliy Sergeevich Portnov, Gulmadina Bulatovna Amangeldiyeva, Akmaral Bakhytbekovna Demeuova, Yessimkhan Sherekhanovich Seitkhaziyev, Dulat Kalimovich Azhgaliev","doi":"10.1007/s11631-023-00660-4","DOIUrl":null,"url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"43 3","pages":"520 - 534"},"PeriodicalIF":1.4000,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11631-023-00660-4.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Geochimica","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s11631-023-00660-4","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}

引用次数: 0

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.

查看原文本刊更多论文

哈萨克斯坦南图尔盖盆地油气聚集区形成的地球化学先决条件

本研究预测了哈萨克斯坦南图尔盖盆地阿里斯库姆凹陷有利的油气源岩形成条件。本研究利用岩心（热解）和石油（生物标记和碳同位素组成）样本的地球化学分析数据，通过确定有机物的环境条件来评估有机物的热成熟度和特征。根据热解获得的地球化学参数，大多数研究样本原岩的石油生成潜力从贫油到富油不等。面源有机质主要是腐殖质，较少是腐殖质-皂质，这表明所研究样本中的有机质是在中度还原条件（III 和 II 型角质）和沿海-海洋环境（I 型角质）下积累的。从阿里斯库姆洼地侏罗纪沉积物中提取的油类的碳同位素组成也表明有机物属于皂质和腐殖-皂质混合类型（角质II和I型）。对油类的生物标记分析表明，有机物最初是在缺氧环境中形成的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-

CiteScore

2.80

自引率

6.20%

发文量

1134

期刊介绍： Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.