收稿日期: 2014-10-30
修回日期: 2015-01-07
网络出版日期: 2015-05-10
基金资助
陕西省自然科学基金项目“鄂尔多斯盆地延长组陆相富有机质页岩孔隙特征及其控制因素”(编号：2013JQ5003)|国家科技重大专项“鄂尔多斯盆地及周边页岩气资源评价”(编号：2011ZX05018001-004)|西安石油大学博士科研启动基金“准连续型油气藏储层形成机理与油气成藏——以鄂尔多斯盆地为例”(编号:YS29031219)联合资助.
Controlling Role of Sedimentary Environment on the Distribution of Organic-rich Shale:A Case Study of the Chang7 Member of the Triassic Yanchang Formation,Ordos Basin
Received date: 2014-10-30
Revised date: 2015-01-07
Online published: 2015-05-10
富有机质页岩厚度和分布范围是页岩油气形成条件评价的重要内容，而页岩的分布受沉积环境的控制。利用露头和岩心揭示了延长组长7油层组暗色页岩的沉积环境，通过露头和钻井资料确定了暗色页岩纵向结构特征，结合岩心和薄片资料阐述了暗色页岩的沉积构造和显微层理特征；综合实测数据和测井解释资料分析了不同沉积环境下暗色页岩的有机碳含量和有机质类型差异。长7油层组暗色页岩主要发育在三角洲前缘水下分流间湾和半深湖—深湖环境下：三角洲前缘环境下的页岩连续厚度小，呈页岩、砂岩等厚互层或薄页岩和厚砂岩互层；半深湖—深湖环境下，页岩连续厚度大，砂岩厚度小，暗色页岩多发育页理、水平纹层或砂质纹层。三角洲前缘环境下，多以暗色泥岩、粉砂质泥岩为主，页理不发育，暗色页岩有机质类型以Ⅱ2型和Ⅲ型居多；半深湖—深湖环境下，有机碳含量明显高于三角洲前缘环境，有机质类型以Ⅰ型和Ⅱ1型居多。根据页岩纵向和平面分布、页岩沉积构造类型、有机质类型和有机碳含量综合评价认为，半深湖—深湖环境下形成的暗色页岩是延长组页岩油气最有利的勘探对象。
耳闯，赵靖舟，王芮，魏之焜 . 沉积环境对富有机质页岩分布的控制作用——以鄂尔多斯盆地三叠系延长组长7油层组为例[J]. 天然气地球科学, 2015 , 26(5) : 823 -832,892 . DOI: 10.11764/j.issn.1672-1926.2015.05.0823
The thickness and distribution of organic-rich shale are important parts of forming conditions appraising about shale gas and shale oil.The distribution of shale is controlled by sedimentary environments.This study determined the sedimentary environment of dark shale of the Chang 7 Member by field profile and cores.Vertical overlaying features of dark shale were confirmed by field profile and wells.Sedimentary structures and micro-bedding structures were delineated by cores and sections.Differences of total organic content and organic types between dark shale in different sedimentary environments were revealed by testing data and logging interpretation.Dark shale of the Chang 7 member distributes in the subaqueous distributary bay of delta front and semi-deep to deep lacustrine.In semi-deep to deep lacustrine,dark shale has great continuous thickness and sandstones have thin thickness.However,in delta front,dark shale has thin continuous thickness,shale and sandstone interbeddings have similar thickness or thin shale layer and thick sandstone layer.In semi-deep to deep lacustrine,dark shale always has lamellation,horizontal lamination and sandy lamination,whereas lamellation does not develop very well in delta front shales.Organic types of delta front are mainly type Ⅱ2 and Ⅲ,and type I and type Ⅱ1 to semi-deep to deep lacustrine shales,respectively.TOCof semi-deep to deep lacustrine shale are higher than that of delta front shale.Based on these comparisons,we concluded that shales which distribute in semi-deep to deep lacustrine are the more favorable prospecting target for shale gas/oil in the Yanchang Formation.
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