现代地质2017，Vol.31Issue(2)：328-337,10.
鄂尔多斯盆地延长探区延长组页岩气储层孔隙结构特征
Pore Structure Characteristics of Yanchang Formation Shale Gas Reservoir in Yanchang Exploration Area of Ordos Basin
摘要
Abstract
In order to evaluate the space and the gas storage capacity of terrestrial shale gas reservoirs,many shale samples were taken from the Chang 7 and Chang 9 members of the Upper Triassic Yanchang Formation in Yanchang exploration area of Ordos basin,and the pore type and pore structure of these samples and their influ ence factors were studied by the use of scanning electron microscope (SEM),high pressure mercury injection and low-temperature gas adsorption experiments with CO2 and N2.The results reveal the following aspects:(1)There are many types of microscopic pores in these shale samples,mainly including intergranular pores and intragranular pores,and a small amount of crystal particle pores and dissolution pores exists,and organic matter pores are less development.These pores provide the main storage spaces for the shale gasreservoir.(2)Mesopores (2-50 nm) contribute to the main pore volume and specific surface area of Yanchang Formation,accounting for 74.34％ of the total pore volume and 64.40％ of the total surface area.The shale samples from the Chang 9 Member have a greater total pore volume and total specific surface area than those from the Chang 7 Member.(3)The pore structure is dominated by slit type pores and plate pores,and the pore size distribution mainly falls in 0.4-0.9 nm,3-25 nm and 5-200 μm.The average pore size of Yanchang Formation shale is 8.53 nm,and the Chang 7 Member shale has a greater average pore size than the Chang 7 Member shale.(4) The organic carbon content,organic matter maturity and mineral composition content affect the pore development of the Yanchang Formation shale.The mineral composition content is the main controlling factor of the pore development of Yanchang Formation shale which is predominated by the mesopore.The increase of the organic carbon content and maturity of shales mainly play a positive role in the development of the micropore in Yanchang Formation shale.关键词
陆相页岩气储层/孔隙结构/孔隙类型/孔径分布/延长组页岩/延长探区Key words
terrestrial shale gas reservoir/pore structure/pore type/pore size distribution/Yanchang Formation shale/Yanchang exploration area分类
能源科技引用本文复制引用
徐红卫,李贤庆,祁帅,周宝刚,王哲,高文杰,陈金明..鄂尔多斯盆地延长探区延长组页岩气储层孔隙结构特征[J].现代地质,2017,31(2):328-337,10.基金项目
国家自然科学基金项目(41572125) （41572125）
国土资源部公益性行业科研专项基金项目(201311022) （201311022）
国家科技重大专项项目(2016ZX05007-003). （2016ZX05007-003）
