东营凹陷细粒沉积岩岩相组合特征

doi:10.11885/j.issn.1674-5086.2018.11.07.01

摘要/Abstract

摘要： 综合应用岩芯、薄片、全岩X射线衍射等资料，根据岩石组分、沉积构造、TOC和碳酸盐晶体结构等指标划分东营凹陷沙四上-沙三下亚段细粒沉积岩岩相，该段主要发育富有机质纹层状隐晶泥质灰岩、富有机质纹层状微晶泥质灰岩、富有机质纹层状灰质泥岩、富有机质层状泥质灰岩、富有机质层状灰质泥岩、富有机质块状灰质泥岩、含有机质层状灰质泥岩和含有机质层状膏质泥岩相等8种岩相。结合地球化学元素资料恢复的古气候、古盐度、古水深及古水体的氧化还原性和古物源等指标恢复细粒沉积岩的沉积环境，进而明确不同沉积环境细粒沉积岩岩相组合特征及成因。在此基础上，建立了东营凹陷沙四上-沙三下亚段细粒沉积岩的沉积模式。该成果对陆相页岩油勘探有重要指导作用。

关键词: 细粒沉积岩, 沉积环境, 岩相组合特征, 沉积模式, 东营凹陷

Abstract: According to many core observation, thin section identification and X-ray diffraction, lithofacies of fine-grained sedimentary rocks in upper Es4 to lower Es3 in Dongying Depression can be divided into 8 main lithofacies based on rock constituents, sedimentary structure, TOC and carbonate crystal structure: organic-rich laminated cryptocrystalline argillaceous limestone facies, organic-rich laminated microcrystalline argillaceous limestone facies, organic-rich laminated calcareous mudstone facies, organic-rich layered argillaceous limestone facies, organic-rich layered calcareous mudstone facies, organic-rich massive calcareous mudstone facies, organic layered calcareous mudstone facies, organic layered gypsum mudstone facies. We first reconstructed of the ancient environment of climant, salinity, water depth and oxidation and reduction of water bodies on the basis of geochemical elements, then fine-grained sedimentary rock lithofacies assemblage characteristics and origin of different depositional environment was determined. On this basis, fine-grained sedimentary rock sedimentary model of upper Es4 to lower Es3 in Dongying Depression was built. The study is of guideance value for shale oil exploration.

Key words: fine-grained sedimentary rock, depositional environment, lithofacies assemblage characteristics, sedimentary model, Dongying Depression

中图分类号:

TE122

宁方兴, 王学军, 郝雪峰, 杨万芹, 丁桔红. 东营凹陷细粒沉积岩岩相组合特征[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 55-65.

NING Fangxing, WANG Xuejun, HAO Xuefeng, YANG Wanqin, DING Juhong. Fine-grained Sedimentary Rock Lithofacies Assemblage Characteristics in Dongying Depression[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 55-65.

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