谭宝德,张金友,李强,王显东,王志国,王有智
TAN Baode,ZHANG Jinyou,LI Qiang,WANG Xiandong,WANG Zhiguo,WANG Youzhi

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

为进一步明确四川盆地东北部营山地区东岳庙段岩相类型、沉积环境及其对有机质富集的控制机制，利用岩心观察、薄片鉴定、总有机碳含量测定、全岩X射线衍射（XRD）及微量元素分析等技术手段，对岩相-沉积相-古环境的耦合关系开展了研究。结果表明：东岳庙段沉积储层可划分为3大类12种岩相，其中高有机质纹层状黏土质页岩、高有机质层状混合质含灰/灰质页岩、低有机质层状混合质含生屑/生屑质页岩、贫有机质层状介壳灰岩4种岩相是东岳庙段最主要的岩相；识别出砂坪、泥坪、混合坪、盐坪、生屑滩、半深湖泥6种沉积微相，并明确了不同微相与特定岩相组合的成因对应关系；沉积演化序列从下往上为滨浅湖→半深湖→滨浅湖，构成一个完整湖进―湖退旋回，控制了岩相的垂向有序组合；微量元素定量分析表明，w(Sr)/w(Cu)平均为9.28，揭示沉积时期古气候总体温湿，w(Sr)/w(Ba)平均为0.49，揭示古盐度为淡水-半咸水，w(V)/w(V+Ni)平均为0.74，揭示古氧化还原条件为缺氧环境；东岳庙段沉积时期，湿润气候、淡水-半咸水和缺氧环境共同控制了高有机质页岩在半深湖环境中的富集。研究成果系统揭示了营山地区东岳庙段“岩相-沉积环境-有机质富集”的内在联系，可为该区页岩油气勘探提供科学依据。
To further clarify lithofacies types, sedimentary environment and their controlling mechanisms on organic matter enrichment in Dongyuemiao Member of Yingshan area in northeastern Sichuan Basin, coupling relationship among lithofacies, sedimentary facies and paleoenvironment is studied by using technical methods such as core observation, thin section identification, total organic carbon content determination, whole rock X-ray diffraction(XRD) and trace element analysis. The results show that, sedimentary reservoirs in Dongyuemiao Member are divided into 3 major categories and 12 lithofacies types. Among them, 4 most dominant lithofacies include high-organic matter laminated clayey shale, high-organic matter laminated mixed calcareous/argillaceous shale, low-organic matter laminated mixed bioclastic-bearing/bioclastic shale and poor-organic matter laminated shelly limestone. 6 sedimentary microfacies of sand flat, mud flat, mixed flat, salt flat, bioclastic shoal and semi-deep lacustrine mud are identified, clarifying genetic corresponding relationships between microfacies and specific lithofacies assemblages. Sedimentary evolution sequence from bottom to top comprises shallow lake→ semi-deep lake→ shallow lake, forming a complete transgressive and regressive cycle, which controls the vertical ordered assemblage of lithofacies. Quantitative analysis of trace elements reveals an average w(Sr)/w(Cu) of 9.28, indicating a warm and humid paleoclimate during deposition period. The average w(Sr)/w(Ba) is 0.49, suggesting that the paleosalinity is freshwater-brackish water. The average w(V)/w(V+Ni) is 0.74, pointing to an anoxic redox environment. During deposition period of Dongyuemiao Member, the humid climate, freshwater-brackish water and anoxic environment jointly controlled the enrichment of high-organic matter shale in semi-deep lake environment. The research results systematically reveal the intrinsic relationship among “lithofacies-sedimentary environment-organic matter enrichment” in Dongyuemiao Member of Yingshan area, providing a scientific basis for shale oil and gas exploration in this area.

关键词(KeyWords)： 川东北;营山地区;东岳庙段;岩相类型;微量元素;沉积环境;有机质富集
northeastern Sichuan;Yingshan area;Dongyuemiao Member;lithofacies type;trace elements;sedimentary environment;organic matter enrichment

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司科学研究与技术开发项目“四川盆地大庆探区侏罗系陆相页岩油富集机理与关键评价技术研究”（2022DJ1809）

作者(Author): 谭宝德,张金友,李强,王显东,王志国,王有智
TAN Baode,ZHANG Jinyou,LI Qiang,WANG Xiandong,WANG Zhiguo,WANG Youzhi

DOI: 10.19597/J.ISSN.1000-3754.202509056

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