Characteristics and influencing factors of nanopores in the Middle Jurassic Shimengou shale in well YQ-1 of the northern Qaidam Basin

被引：0
|
作者：
Shao L. [1 ]
Liu L. [1 ]
Wen H. [2 ]
Li Y. [2 ]
Zhang W. [2 ]
Li M. [3 ]
机构：
[1] College of Geosciences and Survey Engineering, China University of Mining and Technology (Beijing), Beijing
[2] No.105 Exploration Team, Qinghai Bureau of Coal Geological Exploration, Xining
[3] Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo
来源：
| 1600年 / Science Frontiers editorial department卷 / 23期
关键词：
Middle Jurassic; Nanopore; Northern Qaidam Basin; Shale; Shimengou Formation;
D O I：
10.13745/j.esf.2016.01.015
中图分类号：
学科分类号：
摘要：
The Northern Qaidam Basin (NQB) is a typical continental limnic basin and is also one of the basins with most shale gas potential. In this paper, the characteristics and influencing factors of nanopores of the shales in the Middle Jurassic Shimengou Formation of Well YQ-1 in the Yuqia area of NQB were studied by using nitrogen gas adsorption, total organic carbon content, organic matter maturity, and X-ray diffraction analyses. The results showed that the nanopore structures in the Shimengou shale are complex, and these nanopores can be subdivided into two types based on the nitrogen adsorption-desorption curves and pore diameter distribution. The first type mainly consists of the airtight pores with one end closed and the open parallel plate-slit pores, and the pore diameters are in a range of 3-5 nm. The second type mainly consists of the airtight pores with one end closed and the open inclined slit pores, and the pore diameters are characterized by a bimodal distribution, peaking in a range of 3-5 nm and 8-14 nm. The micropore and mesopore with an aperture smaller than 50 nm provided the dominating specific surface area and pore volume. The volume of micropores, mesopores and total pores showed a positive correlation with the clay contents. The pores of organic matter were less developed at a low maturity. The H9 shale, characterized by a high TOC content, shows a negative correlation between the TOC content and the volume of micopores, mesopores and total pores, while the H8 shale, characterized by a low TOC content, shows no correlation. Pore structures and diameter distributions are related to the hydrodynamic conditions of depositional environment. The clay content is a key factor controlling the nanopore development in shale, and the TOC content and depositional environment also have a certain influence. © 2016, Editorial Office of Earth Science Frontiers. All right reserved.
引用
收藏
页码：164 / 173
页数：9
相关论文
共 10 条
  • [1] Curtis J.B., Fractured shale-gas systems, AAPG Bulletin, 86, 11, pp. 1921-1938, (2002)
  • [2] Chalmers G.R., Bustin R.M., Power I.M., Characterization of gas shale pore systems by porosimetry, pycnometry, surface area, and field emission scanning electron microscopy/transmission electron microscopy image analyses: Examples from the Barnett, Woodford, Haynesville, Marcellus, and Doig units, AAPG Bulletin, 96, 6, pp. 1099-1119, (2012)
  • [3] Ross D.J.K., Marc Bustin R., The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs, Marine and Petroleum Geology, 26, 6, pp. 916-927, (2009)
  • [4] Li M., Shao L.Y., Lu J., Et al., Sequence stratigraphy and paleogeography of the Middle Jurassic coal measures in the Yuqia Coalfield, northern Qaidam Basin, northwestern China, AAPG Bulletin, 98, 12, pp. 2531-2550, (2014)
  • [5] Broekhoff J.C.P., De Boer J.H., Studies on pore systems in catalysts: XIII. Pore distributions from the desorption branch of a nitrogen sorption isotherm in the case of cylindrical pores B. applications, Journal of Catalysis, 10, 4, pp. 377-390, (1968)
  • [6] Sing K.S.W., Everett D.H., Haul R.A.W., Et al., Reporting physisorption data for gas/solid with special reference to the determination of surface systems area and porosity, Pure and Applied Chemistry, 57, 4, pp. 603-619, (1985)
  • [7] Loucks R.G., Reed R.M., Ruppel S.C., Et al., Spectrum of pore types and networks in mudrocks and a descriptive classification for matrix-related mudrock pores, AAPG Bulletin, 96, 6, pp. 1071-1098, (2012)
  • [8] Loucks R.G., Reed R.M., Ruppel S.C., Et al., Morphology, genesis, and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett shale, Journal of Sedimentary Research, 79, 11-12, pp. 848-861, (2009)
  • [9] Curtis M.E., Cardott B.J., Sondergeld C.H., Et al., Development of organic porosity in the Woodford Shale with increasing thermal maturity, International Journal of Coal Geology, 103, 23, pp. 26-31, (2012)
  • [10] Ross D.J.K., Bustin R.M., Characterizing the shale gas resource potential of Devonian-Mississippian strata in the Western Canada sedimentary basin: Application of an integrated formation evaluation, AAPG Bulletin, 92, 1, pp. 87-125, (2008)
1