东营凹陷沙河街组四段上亚段细粒沉积岩岩相特征及与沉积环境的关系

发布时间：2018-06-23 10:11

本文选题：细粒沉积岩 + 岩相特征　；参考：《石油学报》2017年10期

【摘要】：细粒沉积岩的岩相特征影响泥页岩的生烃能力与储集性能,与沉积环境的相互关系分析亦可丰富细粒沉积的研究。然而目前针对陆相细粒沉积岩岩相的研究较为薄弱,基于岩相成因,与沉积环境相结合的岩相特征分析较少。基于大量岩心、薄片、X射线衍射及地球化学数据,以成分为第一要素,以东营凹陷沙河街组四段上亚段细粒沉积岩为例,划分出4大类、12种岩相类型,分析每一种岩相的宏观、微观、成分及成因特征。通过矿物成分、地球化学等多参数的分析发现,沙河街组四段上亚段沉积环境分为4个阶段。沉积环境通过控制岩相主要成分而控制了岩相的类别与发育;沉积环境的旋回性与阶段性变化导致岩相的旋回性与阶段性变化;沉积环境控制岩相发育,岩相亦能反应沉积环境的变化。在细粒沉积分析中,不能排除突发事件(海侵、浊流等)对岩相及沉积环境的影响。
[Abstract]:The lithofacies characteristics of fine-grained sedimentary rocks affect the hydrocarbon generation and reservoir performance of shale, and the correlation analysis with sedimentary environment can also enrich the study of fine-grained deposition. However, the present study on the microfacies of continental fine grain sedimentary rocks is relatively weak, and the lithofacies characteristics combined with sedimentary environment are less based on the origin of lithofacies. Based on a large number of core, thin slice X-ray diffraction and geochemical data, taking the composition as the first element and taking the upper submember fine sedimentary rocks of the Shahejie formation in Dongying depression as an example, four types and 12 types of lithofacies are classified, and the macroscopic features of each lithofacies are analyzed. Microscopic, composition and genetic characteristics. It is found that the sedimentary environment of the upper member of the fourth member of the Shahejie formation can be divided into four stages through the analysis of the mineral composition, geochemistry and other parameters. Sedimentary environment controls the type and development of lithofacies by controlling the main components of lithofacies; the cyclicity and phase change of sedimentary environment leads to the cyclicity and phase change of lithofacies; the sedimentary environment controls the development of lithofacies. Lithofacies can also reflect changes in the sedimentary environment. The influence of sudden events (transgression, turbidity current, etc.) on lithofacies and sedimentary environment can not be excluded in fine grain deposition analysis.
【作者单位】：中国石油化工股份有限公司石油勘探开发研究院;中国石油化工集团公司页岩油气勘探开发重点实验室;中国地质大学能源学院;中国石油大学地球科学与技术学院;
【基金】：国家自然科学基金项目(No.41602142) 国家重大科技专项(2016ZX05036-004-001) 中国博士后基金项目(No.2017T100523,2015M582465) 山东省自然科学基金项目(ZR2016DB16) 中国石油化工股份有限公司科技攻关项目(P16043)资助
【分类号】：P512.2;P588.2

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