Geochemical characteristics and exploration significance of Middle–Lower Jurassic source rocks in the Beshkent Depression and adjacent areas of the Amu Darya Basin

被引：0
|
作者：
Nie M. [1 ,2 ]
Zhang B. [1 ,2 ]
Zhao W. [3 ]
Xu S. [4 ]
Zhang R. [5 ]
Liu H. [5 ]
机构：
[1] College of Safety Science and Engineering, Liaoning Technical University, Liaoning, Huludao
[2] MOE Key Laboratory of Mine Thermodynamic disasters and Control, Ministry of Education/, Liaoning Technical University, Liaoning, Huludao
[3] Guizhou Shuicheng Mining Industry Group Co., Ltd., Guizhou, Liupanshui
[4] PetroChina Research Institute of Petroleum Exploration & Development, Beijing
[5] College of Mining Engineering, Liaoning Technical University, Liaoning, Fuxin
来源：
Natural Gas Industry | 2023年 / 43卷 / 10期
关键词：
Amu Darya Basin; Beshkent Depression; Central Asian coal-derived gas domain; Geochemical characteristics; Giant gas field; Marine-continent transitional source rock;
D O I：
10.3787/j.issn.1000-0976.2023.10.005
中图分类号：
学科分类号：
摘要：
The Middle–Lower Jurassic in the Beshkent Depression and its adjacent areas of the Amu Darya Basin develops a set of potential source rocks, which is also a set of potential petroleum system, but the current research is weaker. Therefore, through organic geochemical analysis of drilling cores and cuttings and basin modeling methods, the geochemical characteristics of organic matter (such as abundance, types and maturity) of the Middle–Lower Jurassic source rocks in the Beshkent Depression and adjacent areas are studied, as well as their formation environment, and the exploration direction is clarified. The results show that the organic matter abundance of source rocks in the marine-continent transitional mudstone section of the Middle–Lower Jurassic is 0.50%–3.53% (averaging 1.27%), the organic matter type is II2–III, and the thermal evolution degree of the organic matter is 0.7%–1.1%, thus they are effective source rocks. The shallow marine argillaceous limestone in the upper part of the mudstone section is a non-effective source rock with low organic matter abundance. The soluble organic matter in mudstone source rocks is dominated by low-carbon n-alkanes with a typical single peak. The content of C27 sterane is higher than that of C29 sterane, and the content of tricyclic terpane and tetracyclic terpane is high, but the saturation/aromatic ratio is low, the content of pregnane is high, and the content of aromatic sulfur fluorene is high. Therefore, organic matter may come from shallow-water macrobenthic algae, and was formed in the lagoon environment. It is concluded that the Middle–Lower Jurassic source rocks in the Beshkent Depression had matured in the late stage of the Early Cretaceous, mainly generating gas and supplemented by oil. They are still in the peak stage of hydrocarbon generation and are well configured with the formation period of structural traps, with large potential to form a reservoir. Tight sandstone gas is an important exploration direction of the Middle–Lower Jurassic petroleum system. © 2023 Natural Gas Industry Journal Agency. All rights reserved.
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页码：47 / 54
页数：7
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