中国四川盆地东部二叠系茅口地层白云岩储层成因流体的来源和 U-Pb 年表

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Minerals Pub Date : 2024-08-07 DOI:10.3390/min14080803
Shuangjian Li, Jian Gao, Tianbo Yang, Tianyi Li, Tianjia Liu, Yunqing Hao, Zhiliang He, Entao Liu
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引用次数: 0

摘要

基底断层活动促进的热液白云岩化对四川盆地二叠系茅口组白云岩产生了重要影响,该组白云岩经历了复杂的成岩作用,并呈现出强烈的储层异质性。这一演替中成岩流体的来源和年龄仍存在争议。本研究对从四川盆地东部15号断层附近露头和井中采集的样品进行了多种分析,包括岩石学、微域同位素、稀土元素、流体包裹体均化温度和激光烧蚀电感耦合等离子体质谱(LA-ICP-MS)U-Pb定年,以重建多阶段流体活动并分析其对储层发育的影响。细粒基质白云岩和鞍状白云岩中原生卤水包裹体的均质化温度集中在 100 至 150 ℃ 之间,这表明受到了其他地质体异常高温的影响。δ13C和δ18O值以及较低的87Sr/86Sr值表明细粒基质白云岩的成岩流体主要是二叠纪海水。细粒基质白云岩的U-Pb年龄约为260Ma,与峨眉山大火成岩带的主岩浆活动年龄相吻合,热液为五叠纪提供了有利的高温环境。高放射性 87Sr/86Sr 成分表明了鞍状白云岩的成分,而高温富 Sr 形成液则表明了鞍状白云岩的成分。鞍状白云岩的 U-Pb 年龄为 245-250 Ma,与 ELIP 的 255~251 Ma 岩浆活动年龄相吻合。这表明它们应该是 ELIP 热液在浅埋阶段的成岩产物。粗粒方解石的U-Pb年龄为190-220 Ma,应为深埋阶段的成岩产物。粗粒方解石中发育有与原生甲烷包裹体相关的盐水包裹体,均化温度范围为140.8-199.8 ℃,表明地层流体活动与烃充填有关。二叠系茅口地层白云岩首先形成于半同期浅埋阶段,在ELIP活跃期,由于基底断层和异常高的热流,白云岩进一步热液白云化。热液白云岩化促进了晶间孔隙和溶蚀孔隙的形成和维持,同时也形成了鞍状白云岩填充孔隙,减少了孔隙空间。深部流体活动对储层演化的影响得到了进一步区分。
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Source and U-Pb Chronology of Diagenetic Fluids in the Permian Maokou Formation Dolomite Reservoir, Eastern Sichuan Basin, China
The hydrothermal dolomitization, facilitated by basement fault activities, had an important impact on the Permian Maokou Formation dolomite in the Sichuan Basin, which experienced complex diagenesis and presented strong reservoir heterogeneity. The source and age of diagenetic fluids in this succession remain controversial. In this study, various analyses were implemented on samples collected from outcrops and wells near the No. 15 fault in the eastern Sichuan Basin to reconstruct the multi-stage fluid activity and analyze the impact on reservoir development, including petrology, micro-domain isotopes, rare earth elements, homogenization temperature of fluid inclusions, and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) U-Pb dating. The homogenization temperature of primary brine inclusions in fine-grained matrix dolomite and saddle dolomite is concentrated between 100 and 150 °C, which indicates that the impacts of abnormally high temperatures of other geological bodies. The δ13C and δ18O value and low 87Sr/86Sr value indicate that the diagenetic fluid of fine-grained matrix dolomite is mainly Permian seawater. The U-Pb ages of fine-grained matrix dolomite are ~260 Ma, which coincides with the age of the main magmatism of Emeishan Large Igneous Province (ELIP), and hydrothermal fluid provided a favorable high-temperature environment in the penecontemporaneous stage. While highly radiogenic 87Sr/86Sr compositions suggests those of saddle dolomite, the high-temperature Sr-rich formation fluid. The U-Pb ages of saddle dolomite are 245–250 Ma, which coincides with the age of the 255~251 Ma magmatism of ELIP. This indicates that those should be the diagenetic products of the ELIP hydrothermal fluid in the shallow burial stage. The U-Pb age of coarse-grained calcite is 190–220 Ma, and it should be the diagenetic product of the deep burial stage. Brine inclusions associated with primary methane inclusions were developed in coarse-grained calcite, with a homogenization temperature range of 140.8–199.8 °C, which indicates that the formation fluid activities were related to hydrocarbon charging. The Permian Maokou Formation dolomite was firstly formed in the penecontemporaneous shallow burial stage, and then it was subjected to further hydrothermal dolomitization due to the basement faulting and the abnormally high heat flow during the active period of ELIP. Hydrothermal dolomitization contributed to the formation and maintenance of intercrystalline and dissolution pores, whereas it also formed saddle dolomite to fill the pores, and reduce the pore space. The influence of deep fluid activities on reservoir evolution is further distinguished.
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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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