浅地表地层中亚铁离子的分布特征及其地球化学意义  

Distribution characteristics of ferrous ions in shallow surface strata and its geochemical significance

作　　者：李广之 宁丽荣[1] 王国建[1] 胡斌 LI Guangzhi;NING Lirong;WANG Guojian;HU Bin(Wuxi Research Institute of Petroleum Geology,Research Institute of Petroleum Exploration&Development,SINOPEC,Wuxi 214126,Jiangsu,China)

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126

出　　处：《矿产与地质》2022年第5期1029-1033,共5页Mineral Resources and Geology

基　　金：国家科技部国家重点研发计划课题“华南火成岩地区深层地热资源探测技术”(2019YFC0604902);中国石油化工股份有限公司科技部课题“东南深层地热物化探关键技术研究及应用”(P20041-2)共同资助。

摘　　要：油气藏中的烃类及地热伴生气中的还原组分会使地层中的Fe^(3+)转化为Fe^(2+),Fe^(2+)主要存在于相对还原的环境中,在浅地表地层中主要分布于烃类运移的通道上、油气藏上方地层中及地热伴生气的通道上。分析近浅地表土壤(岩石)中的Fe^(2+)及Fe^(3+)的含量变化特征,不仅可揭示油气藏中的烃类气体垂向微运移踪迹,还可指示成烃的氧化还原环境,也可对探井的含油气性进行评价,并可预测下伏对应地层的含油气信息,同时可以预测下伏地层中可能存在的地热资源。Hydrocarbons in oil and gas reservoirs and reducing components in geothermal associated gas will convert Fe^(3+)into Fe^(2+)in the formation. Fe^(2+)mainly exists in a relatively reduced environment, and is mainly distributed on the channels of hydrocarbon migration in shallow surface strata and in the strata above the oil and gas reservoirs and in the channels associated with geothermal gas generation. For the analysis of the characteristics of Fe^(2+)and Fe^(3+)content in near-surface soil(rock), it can not only reveal the vertical micro-transport of hydrocarbon gas in oil and gas reservoir, but also indicate the redox environment of hydrocarbon formation. It can also evaluate the petroleum-bearing properties of exploratory wells, and can predict the petroleum-bearing information of the underlying corresponding strata, and predict the possible geothermal resources in the underlying strata, and at the same time can predict the geothermal resources that might exist in the underlying strata.

关 键 词：烃类 地热 Fe^(2+) Fe^(3+) 分布特征 地球化学意义 

分 类 号：P632[天文地球—地质矿产勘探] P618.13[天文地球—地质学]