四川盆地东部寒武纪 DEPS 的成因系统及其地质意义

IF 1.1 4区 地球科学 Q3 GEOLOGY
Jixuan Wang, Zhonggui Hu, Lin Guan, Jiuzhen Hu, Jie Ren, Jun Zhang
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引用次数: 0

摘要

为了确定四川盆地东部寒武纪DEPS(白云岩-蒸发岩副成因系统)的成因和演化,研究了C、O和流体包裹体的同位素地球化学特征。根据水文系统确定了寒武纪 DEPS 的四个成因系统。这四个成因系统包括:半同期阶段的孔隙卤水、早期成因阶段的密封卤水、中期和晚期成因阶段的压实热卤水以及晚期构造隆起阶段涉及深层热水的混合热液。不同成因阶段和系统的流体特征和来源具有一定的熟悉性和发展演化的继承性特征。但是,不同成因阶段和成因体系的流体对储层的影响也不尽相同。成岩体系和成岩方式与储层发育密切相关。这些成因系统包括早期成因阶段的埋藏白云石化和密封盐水溶解,以及构造隆起阶段的热化学硫酸盐还原(TSR)和涉及深层热水的混合热液再结晶。盆地构造分析表明,四川盆地东部寒武系脱落层引起的一系列断层是控制DEPS成因系统与储层时空耦合关系的主导因素。滩涂亚地层控制了储层的区域分布。在早期成岩阶段,埋藏的白云石化有助于储层的继续发育,而构造成岩阶段的TSR和重结晶则通过提高孔隙度和渗透率来改善储层质量。寒武系DEPS地层与下伏琼珠寺地层泥页岩构成了四川盆地东部优质的源-储层-岩体组合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Diagenetic systems of Cambrian DEPS in Eastern Sichuan basin and geological significance

Diagenetic systems of Cambrian DEPS in Eastern Sichuan basin and geological significance

To determine the diagenesis and evolution of the Cambrian DEPS (dolomite-evaporite paragenetic system) in the eastern Sichuan basin, the isotopic geochemistry characteristics of C, O, and fluid inclusions were studied. Four diagenetic systems were determined in the Cambrian DEPS based upon the hydrological system. These include the pore brine during the penecontemporaneous stage, sealed brine during the early diagenetic stage, compaction hot brine during the middle and late diagenetic stage, and mixed hydrothermal fluids involving deep thermal water during the later tectonic uplift stage. The character and source of fluids of various diagenetic stages and systems have a certain familiarity and inheritance features of development and evolution. However, fluids of various diagenetic stages and systems have different effects on the reservoirs. The diagenetic systems and manner of diagenesis are related to reservoir development closely. These include burial dolomitization and dissolution of sealed brine of the early diagenetic stage, and TSR (thermochemical sulfate reduction) and recrystallization of the mixed hydrothermal fluids involving deep thermal water during the tectonic uplift stage. Analyzing the basin structure indicates that a series of faults caused by the Cambrian detachment layer in the Eastern Sichuan Basin are the dominant factor controlling the spatiotemporal coupling relationship between the diagenetic systems and the reservoir in DEPS. The shoal subfacies control the regional distribution of the reservoir. During the early diagenetic stage, buried dolomitization helped with continued reservoir development, while TSR and recrystallization in the tectonic diagenetic stage improved reservoir quality by enhancing porosity and permeability. The Cambrian DEPS strata and the underlying Qiongzhusi Formation mud shale form a high-quality source-reservoir-caprock assemblage in the eastern Sichuan Basin.

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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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