Hydrocarbon Accumulation and Overpressure Evolution in Deep–Ultradeep Reservoirs in the Case of the Guole Area of the Tarim Basin

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-07-31 DOI:10.3390/min14080790
Zhanfeng Qiao, Tianfu Zhang, Ruyue Wang, Yahao Huang, Yifan Xue, Jiajun Chen, Haonan Tian, Anjiang Shen, Chunsong Si
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Abstract

Usually, deep oil and gas accumulation is often controlled by strike–slip faults. However, in the Tarim Basin, deep Ordovician oil and gas accumulations are also found in areas far from the fault zone. The process of oil and gas accumulation in deep reservoirs far from strike–slip fault zones is still unclear at present. The source and evolution of Ordovician fluids were analyzed using inclusion geochemical methods and the U–Pb dating technique. The analysis of rare earth elements and carbon–oxygen–strontium isotopes in the reservoirs showed that the reservoirs were weakly modified by diagenetic fluid. The fluid was derived from the fluid formation during the same period as the seawater, and no oxidizing fluid invaded the reservoir. The late oil and gas reservoirs had good sealing properties. The U–Pb dating results combined with homogenization temperature data revealed that the first-stage oil was charged during the Late Caledonian Period, and the second-stage natural gas was charged during the Middle Yanshanian Period. The evolution of the paleo-pressure showed that the charging of natural gas in the Middle Yanshanian was the main reason for the formation of reservoir overpressure. The strike–slip fault zone was basically inactive in the Middle Yanshanian. During this period, the charged natural gas mainly migrated to the reservoir along the unconformity surface and the open strike–slip fault zone in the upper part of the Ordovician reservoir. The source of the fluid shows that the reservoir in the late stage had good sealing properties, and there was no intrusion of exogenous fluid. The overpressure in the reservoir is well preserved at present.
塔里木盆地郭勒地区深层-超深层储层的碳氢化合物积累和超压演化
通常,深层石油和天然气的积聚往往受走向滑动断层的控制。但在塔里木盆地,远离断层带的地区也有奥陶系深层油气聚集。目前,远离走向滑动断层带的深层油气藏的油气积累过程尚不清楚。研究人员利用包裹体地球化学方法和铀-铅年代测定技术分析了奥陶纪流体的来源和演化过程。储层中稀土元素和碳氧锶同位素的分析表明,储层受到成岩流体的弱改造。这些流体与海水来自同一时期的流体层,没有氧化性流体侵入储层。晚期油气藏具有良好的密封性。铀-铅年代测定结果与均质温度数据相结合,揭示了第一期石油充注于加里东晚期,第二期天然气充注于燕山期中期。古压力的演变表明,中燕山期天然气的充注是储层超压形成的主要原因。在中燕山期,走向滑动断层带基本处于不活动状态。在此期间,带电天然气主要沿奥陶系储层上部的不整合面和开放的走向滑动断层带向储层迁移。流体来源表明,晚期储层具有良好的密封性,没有外源流体侵入。储层中的超压目前保存完好。
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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