中南大学学报（自然科学版）2024，Vol.55Issue(3)：994-1007,14.DOI:10.11817/j.issn.1672-7207.2024.03.014
断陷湖盆细粒区页岩组构特征与页岩油富集成藏规律:以黄骅坳陷古近系为例
Fabric characteristics and oil accumulation laws of shales in fine-grained areas of faulted lacustrine basin:a case of Paleogene in Huanghua Depression
摘要
Abstract
In order to clarify the microscopic fabric characteristics and oil accumulation laws of shales in fine-grained areas of faulted lacustrine basin,based on the core data,logging data and oil testing data of three sets of shale successions in the second member of Kongdian Formation(Kong 2 for short),the third member and the first member of Shahejie Formation(Sha 3 and Sha 1 for short)of the Paleogene in Huanghua Depression,mineral analysis-field emission scanning electron microscope,argon ion polishing-field emission scanning electron microscope,focused ion beam-field emission scanning electron microscope etc.were used to characterize shale samples at multiple scales and dimensions in detail.The characteristics of shale minerals,organic matter,pores and shale oil occurrence were systematically analyzed from the microscopic and quantitative points of view,to reveal the accumulation and enrichment laws,and enrichment model of shale oil.The results show that in the microscopic view,complex types of shales are composed by multiple types of minerals mix and stack in laminae.The reservoir space in shale can be divided into nine types in three categories,including inorganic pore,organic pore and microfracture.Inorganic pores account for more than 85%on average,and pores with diameters less than 50 nm take up the majority of the reservoir space.Microscopically,there are three types of organic matter,synsedimentary organic matter,intergrown and differentiated organic matter,and migration and filling organic matter.Based on the characteristics,distribution and spatial interrelationship of four elements,including minerals,organic matter,reservoir space and hydrocarbons in shale strata,a"four-element coupling"reservoir accumulation and enrichment law is proposed,and three types of shale oil accumulation and enrichment models are sorted out.Under the guidance of these models,several horizontal wells have tapped high oil production in the Kong 2 Member in Cangdong Sag,and high-quality shale oil blocks have realized economically viable development at the current oil prices.Meanwhile,shale oil exploration has made major breakthrough in Sha 3 Member and lower submember of Sha 1 Member in Qikou Sag.All these show broad exploration prospects of Paleogene shale oil in Huanghua Depression.关键词
页岩油/孔店组二段/沙河街组三段/沙河街组一段/黄骅坳陷/组构特征/富集成藏规律Key words
shale oil/the second member of Kongdian Formation/the third member of Shahejie Formation/the first member of Shahejie Formation/Huanghua Depression/fabric characteristics/oil accumulation laws分类
能源科技引用本文复制引用
蒲秀刚,许静,董姜畅,付永强,时战楠,柴公权,陈长伟,姜文亚,韩文中,鄢继华,官全胜..断陷湖盆细粒区页岩组构特征与页岩油富集成藏规律:以黄骅坳陷古近系为例[J].中南大学学报（自然科学版）,2024,55(3):994-1007,14.基金项目
国家重点研发计划项目(2022YFF0801204,2020YFA0710504)(Projects(2022YFF0801204,2020YFA0710504)supported by National Key Research and Development Program) （2022YFF0801204,2020YFA0710504）
