| 鄂尔多斯盆地延长探区延长组页岩气储层孔隙结构特征 |
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| 引用本文： | 徐红卫,李贤庆,祁帅,周宝刚. 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 |
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| 作者姓名： | 徐红卫 李贤庆 祁帅 周宝刚 |
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| 作者单位： | 1中国矿业大学(北京)煤炭资源与安全开采国家重点实验室，北京100083；2中国矿业大学(北京)地球科学与测绘工程学院，北京100083 |
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| 基金项目： | 国家自然科学基金项目(41572125)；国土资源部公益性行业科研专项基金项目(201311022)；国家科技重大专项项目(2016ZX05007-003) |
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| 摘 要： | 为了评价陆相页岩气储层的储集空间和储气能力，以鄂尔多斯盆地延长探区上三叠统延长组长7段、长9段页岩为研究对象，运用电子扫描显微镜、高压压汞、低温CO2和N2气体吸附等实验方法,对陆相页岩气储层孔隙类型特征、孔隙结构及其影响因素进行研究。结果表明：(1)延长探区上三叠统延长组陆相页岩发育多种类型微观孔隙，以粒间孔和粒内孔为主，少量晶间孔和溶蚀孔,有机质孔发育较少，为陆相页岩气赋存提供了储集空间；(2)延长组页岩中介孔(2～50 nm)贡献了其主要的孔容和比表面积，占总孔容的7437%，占总比表面积的6440%，且长9段页岩的总孔容和总比表面积均大于长7段页岩；(3)延长组页岩孔隙结构以狭缝型孔和板状孔为主，孔径主要分布在04～09 nm、3～25 nm和5～200 μm区间段内，延长组页岩平均孔径为853 nm，且长7段页岩平均孔径大于长9段页岩；(4)页岩有机碳含量、有机质成熟度及矿物成分含量共同影响着延长组页岩孔隙的发育，其中矿物成分含量是以介孔孔隙为主的延长组页岩孔隙发育的主控因素，有机碳含量及成熟度的增加主要对页岩中微孔孔隙的发育起到积极作用。
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| 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 |
Pore Structure Characteristics of Yanchang Formation Shale Gas Reservoir in Yanchang Exploration Area of Ordos Basin |
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| XU Hongwei,LI Xianqing,QI Shuai,ZHOU Baogang. Pore Structure Characteristics of Yanchang Formation Shale Gas Reservoir in Yanchang Exploration Area of Ordos Basin[J]. Geoscience of Geosciences, 2017, 31(2): 328 |
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| Authors: | XU Hongwei LI Xianqing QI Shuai ZHOU Baogang |
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| Affiliation: | 1State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing)，Beijing100083，China; 2College of Geoscience and Surveying Engineering，China University of Mining and Technology (Beijing)，Beijing100083，China |
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| 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 influence 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 7434% of the total pore volume and 6440% 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 04-09 nm，3-25 nm and 5-200 μm. The average pore size of Yanchang Formation shale is 853 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. |
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| Keywords: | terrestrial shale gas reservoir pore structure pore type pore size distribution Yanchang Formation shale Yanchang exploration area |
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