Characteristics of Carbonate Cements in Sandstone of Shahejie Formation in Western Depression, Liaohe Basin

被引：0
|
作者：
Zhu F. [1 ,2 ]
Zhou H. [1 ,2 ]
机构：
[1] School of Earth Resources, China University of Geosciences, Wuhan
[2] Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 12期
关键词：
carbonate cement; isotopic geochemistry; Liaohe basin; petroleum geology; Shahejie Formation;
D O I：
10.3799/dqkx.2022.460
中图分类号：
学科分类号：
摘要：
The study of oxygen and carbon isotopic compositions of carbonate cements is an important technical method to analyze fluid-rock interaction during diagenesis. By means of petrology, mineralogy and geochemistry, the chemical composition and isotopic composition of carbonate cements and diagenetic fluids in sandstones of Shahejie Formation in western depression of Liaohe basin are systematically analyzed. The results show that the carbonate rocks in the study area are mainly calcite and dolomite, and the main types of cementation are inlaid cementation, pore cementation, patchy cementation and star-point cementation. The stable isotopic composition of carbon and oxygen can effectively reflect the origin of diagenetic and ore-forming fluids and other materials. The oxygen isotopic composition of carbonate cements is very different from that of shallow groundwater but similar to that of metamorphic water, which reflects the influence of active thermal fluid on diagenesis during basin evolution. The hydrogen and oxygen isotopic compositions of the inclusions can represent the evolution characteristics of the ore-forming solutions. The inclusions of the sandstone carbonate cements are enriched with light isotopes of hydrogen and heavy isotopes of oxygen, indicating the obvious "oxygen-18 drift". The carbonate cemented ore-forming solution shows the isotopic composition of "heated rain", which reflects the influence of deep active thermal fluid on diagenesis. © 2022 China University of Geosciences. All rights reserved.
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页码：4724 / 4730
页数：6
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