雪峰隆起西缘牛蹄塘组页岩古氧化还原特征研究  

Research on the paleoredox characteristics of the Niutitang formation shale in the western edge of the Xuefeng uplift

作　　者：王奕松 陈祎 龙萃芸 曾旎 刘苏瑶 谭欣 吴传杰 雷昌远 冯霞 WANG Yisong;CHEN Yi;LONG Cuiyun;ZEGN Ni;LIU Suyao;TAN Xin;WU Chuanjie;LEI Changyuan;FENG Xia(Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas,Ministry of Natural Resources,Guiyang Guizhou 550000,China;Guizhou Engineering Research Institute of Oil&Gas Exploration and Development,Guiyang Guizhou 550000,China)

机构地区：[1]自然资源部复杂构造区非常规天然气评价与开发重点实验室,贵州贵阳550000 [2]贵州省油气勘查开发工程研究院,贵州贵阳550000

出　　处：《石油化工应用》2024年第7期70-74,80,共6页Petrochemical Industry Application

基　　金：贵州省科技支撑项目(黔科合支撑[2023]一般370);贵州省科技厅找矿突破战略行动重大协同创新项目(黔科合战略找矿[2022]ZD005);贵州省基础研究计划(自然科学类)项目(黔科合基础-ZK[2023]一般192);贵州页岩气勘探开发有限责任公司项目(FW2022042、FW2022043)。

摘　　要：贵州省寒武系牛蹄塘组页岩气资源丰富,为深入研究其页岩沉积的氧化还原条件特征,启发区域页岩气的勘探及相关研究。以雪峰隆起西缘QX1井的牛蹄塘组富有机质页岩为对象,针对古氧化还原条件特征开展了微量元素研究。研究显示,样品的V/Cr、Ni/Co、Mo-U富集系数协变模式图等指示牛蹄塘组整体为还原环境,其变化具体表现为牛蹄塘组沉积早中期为缺氧的还原环境,晚期快速变为硫化静海的强还原环境,而在末期又明显变为贫氧-含氧的弱还原环境。各氧化还原指标与TOC的相关性显示,牛蹄塘组的有机质富集受古氧化还原条件影响较强。The Guizhou Province has abundant shale gas resources in the Cambrian Niutitang formation.To further study the redox conditions of its shale deposits,inspire exploration and related research of regional shale gas.A trace element study was conducted on the organic rich shale of the Niutitang formation in well QX1 at the western edge of the Xuefeng uplift,targeting the characteristics of ancient redox conditions.Research has shown that the V/Cr,Ni/Co,Mo-U,et al.of the samples indicate that the overall Niutitang formation is a reducing environment.The specific changes are as follows,the early and middle stages of Niutitang formation sedimentation were in an anoxic reducing environment,and in the late stage,it rapidly transformed into a strong reducing environment of euinxic,and in the end stage,it clearly became a weak reducing environment with suboxic and oxic.The correlation between various redox indicators and TOC shows that the organic matter enrichment of the Niutitang formation is strongly influenced by ancient redox conditions.

关 键 词：雪峰隆起西缘 页岩气 牛蹄塘组 氧化还原 微量元素 

分 类 号：TE132.2[石油与天然气工程—油气勘探]