| 鲁西地区张夏组碳酸盐岩成岩系统 |
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| 引用本文： | 樊爱萍,杨仁超,韩作振,崔明明,蔡娜.鲁西地区张夏组碳酸盐岩成岩系统[J].沉积学报,2015,33(1):67-78. |
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| 作者姓名： | 樊爱萍 杨仁超 韩作振 崔明明 蔡娜 |
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| 作者单位： | 1.山东省沉积成矿作用与沉积矿产重点实验室 山东科技大学地科学院 山东青岛 266590; |
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| 基金项目： | 国家自然科学基金(批准号:40972043);教育部科学技术研究重点项目(编号:211097);山东省中青年科学家基金(编号:BS2009HZ020,2010BSE06022);山东省高校科学计划项目(编号:G08LD01,J09LE04);山东科技大学科研创新团队计划(编号:2010KYTD103)联合资助 |
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| 摘 要： | 鲁西地区寒武系碳酸盐岩广泛发育,但针对该区碳酸盐岩成岩作用的研究较少.镜下鉴定显示研究区发育压实作用、胶结作用这两种破坏性成岩作用及溶解作用、压溶作用和白云石化作用等三种建设性成岩作用.新生变形作用对物性的影响可分两种情况,退变新生变形作用对改善岩石物性意义不大,进变新生变形作用有利于晶间孔的形成.结合流体包裹体分析,将研究区张夏组划分为海水、大气淡水、封存压实卤水、温压水4个连续演化的成岩系统,不同成岩系统中发育不同的成岩流体体系和成岩作用类型.海水成岩系统的特征为:在浅海海底成岩环境下,成岩温度低,流体包裹体为单相;成岩作用有压实、泥晶化作用、胶结作用(形成纤维状、共轴纤维状、共轴增生胶结物),海水和淡水过渡带鲕粒发生白云石化作用.在大气淡水系统:早成岩期的成岩体系为CaCl2-H2O、NaCl-H2O、MgCl2-H2O和NaCl-MgCl2-H2O盐水体系,且盐度较低,发育等轴粒状方解石胶结作用和淡水溶解作用;古表生期和表生期发育溶解作用.封存压实卤水成岩系统,成岩流体体系为NaCl-MgCl2-MgSO4和KCl-CaCl2-H2O体系,主要发育胶结作用和压溶作用.温压水系统中,成岩流体体系为CaCl2-H2O、NaCl-CaCl2-6H2O、NaCl-MgCl2-MgSO4、MgCl2-H2O和FeCl2-H2O,发育胶结作用、埋藏溶蚀、压溶作用(表现为粗缝合线)和进变新生变形作用.淡水成岩系统和温压水系统都有利于溶解作用的发育,但是淡水成岩系统中选择性的溶解作用造成的溶蚀孔隙多被后期胶结物充填,而温压水体统中的溶蚀作用可新增1%~5%次生孔隙;压溶作用形成的未被完全充填的粗缝合线和进变新生变形作用发育的晶间孔,均有利于改善岩石物性.
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| 关 键 词： | 鲁西地区 寒武系 成岩体系 流体包裹体 碳酸盐岩 |
| 收稿时间： | 2013-12-23 |
Carbonate Diagenetic System of Zhangxia Formation in West Shandong Province |
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| FAN AiPing;YANG RenChao;HAN ZuoZhen;CUI MingMing;CAI Na.Carbonate Diagenetic System of Zhangxia Formation in West Shandong Province[J].Acta Sedimentologica Sinica,2015,33(1):67-78. |
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| Authors: | FAN AiPing;YANG RenChao;HAN ZuoZhen;CUI MingMing;CAI Na |
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| Institution: | 1.Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590;2.Shandong Province Experimental Institute of Geological Science, Ji'nan 250013 |
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| Abstract: | Carbonate rock is widely developed in the Cambrian system in the west Shandong province but rare studies have been conducted on the diagenesis of the carbonate rock there. It can be inferred from microscopic observation of this study that there exist compaction and cementation as distructive diagenesis and dissolution, pressolution and dolomitization as constructive diagenesis in the studied area. Degrading neomorphism and aggrading neomorphism affect the physical properties of the rock differently, the former one makes little sense to improve the physical properties, while the latter one is conducive to the formation of inter-crystalline pores. Combined with the analysis of fluid inclusions, the Zhangxia Formation comprises four continuously evolved diagenetic systems, including seawater, freshwater, connate water and thermobaric water diagenetic systems where different diagenetic fluid systems and diagenesis types are developed. The seawater diagenetic system is characterized by low diagenetic temperature and single-phase fluid inclusion in the environment of the shallow seabed. Diagenesis in this system mainly involves compaction, micritization/cementation (to form fibriform, coaxial fibriform, coaxial proliferative cements), and dolomitization occurred to the oolite at the seawater-freshwater transition zone. In the freshwater diagenetic system, the early stage witnesses the presence of CaCl2-H2O, NaCl-H2O, MgCl2-H2O and NaCl-MgCl2-H2O low salinity water systems under the actions of isometric calcite cementation and freshwater dissolution; the ancient epidiagenetic stage and the epidiagenetic stage are manifested with the dissolution action. In the connate water diagenetic system, the diagenetic fluid systems are prevailed by NaCl-MgCl2-MgSO4 and KCl-CaCl2-H2O under the actions of cementation and presolution. And the diagenetic fluid systems for thermobaric water diagenetic system are dominated by CaCl2-H2O, NaCl-CaCl2-6H2O, NaCl-MgCl2-MgSO4, MgCl2-H2O and FeCl2-H2O under the modification of cementation, burial dissolution, presolution (in the form of coarse stylolite) and aggrading neomorphism. Both freshwater diagenetic system and thermobaric water diagenetic system are suitable for the development of dissolution. Most dissolved pores caused by selective dissolution in freshwater diagenetic system are merely filled with the cements produced in the later stage. But dissolution in thermobaric water diagenetic system can proliferate by 1%~5% of secondary pores. Both the incompletely filled coarse stylolites that are produced from presolution and the inter-crystalline pores developed under aggrading neomorphism are helpful to improve the physical properties of the carbonate rocks. |
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| Keywords: | West Shandong province Cambrian system diagenetic system fluid inclusions carbonate rocks |
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