Effects of organic matter and mineral compositions on pore structures of shales: A comparative study of lacustrine shale in Ordos Basin and Marine Shale in Sichuan Basin, China
Effects of organic matter and mineral compositions on pore structures of shales: A comparative study of lacustrine shale in Ordos Basin and Marine Shale in Sichuan Basin, China
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有机质和矿物成分对页岩孔隙结构的影响——鄂尔多斯盆地湖相页岩与四川盆地海相页岩对比研究
DOI：
10.1177/0144598717723646
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发表时间：
2018
影响因子：
2.7
通讯作者：
Xing Fengcun
中科院分区：
文献类型：
--
作者：
Tang Xianglu;Jiang Zhenxue;Li Zhuo;Jiang Shu;Peng Yongmin;Xiao Dianshi;Xing Fengcun
页岩孔隙结构对油气的赋存和聚集起着关键作用。选取鄂尔多斯盆地三叠系延长组和四川盆地志留系龙马溪组12个不同时代、不同沉积环境、不同成熟度的具有代表性的样品，采用聚焦离子束扫描电子显微镜和高压压汞毛细管孔隙仪分析页岩孔隙结构。结果表明，三叠系延长组成熟度为Ro <； 1.3%的湖相页岩孔隙主要由孔喉直径大于30 µm的孔隙组成，志留系龙马溪组成熟度为Ro >； 1.3%的海相页岩孔隙主要由孔喉直径小于100 nm的孔隙组成。孔隙度方面，低熟湖相页岩的平均孔隙度为2.4%，高成熟海相页岩的平均孔隙度为1.5%。在孔隙类型上，湖相页岩主要发育粒间无机孔隙，而海相页岩主要发育有机孔隙，孔喉直径为5~2 0 0 nm。与低成熟湖相页岩相比，高成熟海相页岩的大孔隙发育程度较低，微孔隙占优势。重要的是，脆性矿物(石英、长石和碳酸盐矿物)主要影响湖相页岩的孔隙结构，而有机质主要影响海相页岩的孔隙结构。
The pore structure of shale plays key role in oil and gas storage capacity and accumulation. Twelve representative samples were selected from Triassic Yanchang Formation in the Ordos Basin and Silurian Longmaxi Formation in the Sichuan Basin with different ages, depositional settings, and maturities to analyze shale pore structure using focused ion beam-scanning electron microscopy and high-pressure mercury intrusion capillary porosimetry. The results show that the pores of lacustrine shale with maturity Ro < 1.3% from the Triassic Yanchang Formation were predominantly composed of pores with pore throat diameter of larger than 30 µm. The pores of marine shale with maturity Ro > 1.3% from the Silurian Longmaxi Formation were predominantly composed of pores with pore throat diameter of smaller than 100 nm. For the porosity, the average porosity of low-mature lacustrine shale is 2.4%, while the average porosity of high-mature marine shale is 1.5%. For the pore type, intergranular inorganic pores predominantly occurred between mineral particles in the lacustrine shale, while the marine shale mainly developed organic pores with pore throat diameters ranging from 5 to 200 nm. Compared to the low-mature lacustrine shale, macropores of high-mature marine shale are less developed and micropores dominant. Importantly, brittle minerals (quartz, feldspar, and carbonate minerals) mainly affect the pore structure of lacustrine shale, while organic matter mainly affects the pore structure of marine shale.
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影响因子：
2.4
作者：
Cardoso L;Fritton SP;Gailani G;Benalla M;Cowin SC
通讯作者：
Cowin SC
影响因子：
5.6
作者：
X. Fu;Jian Wang;Y. Zeng;F. Tan;Xinglei Feng
通讯作者：
X. Fu;Jian Wang;Y. Zeng;F. Tan;Xinglei Feng
影响因子：
1.5
作者：
KATSUBE, TJ;WILLIAMSON, MA
通讯作者：
WILLIAMSON, MA
影响因子：
2.7
作者：
Yao Ma;Wenhou Li;Chiyang Liu
通讯作者：
Yao Ma;Wenhou Li;Chiyang Liu
影响因子：
3.3
作者：
Wang Yufang;G. Zhai;Shu-jing Bao;S. Ren;Mingna Ge;Zhi Zhou
通讯作者：
Wang Yufang;G. Zhai;Shu-jing Bao;S. Ren;Mingna Ge;Zhi Zhou