Characterization of shale matrix pore structure via experiment and model
- 104 Downloads
Shale gas reservoirs develop multi-scale pores ranging in size from nanometer to micrometer, the characteristics of gas transport involve the multi-scale pore space which divided into organic and inorganic matrix pores. This paper reveals the shale pore structure with large amounts of organic mesoporous based on the techniques of focused ion beam scanning electron microscopes (FIB-SEM), high-pressure mercury intrusion (MICP), and low-pressure adsorption (LPA), which also shows the size and distribution of these pores. Then the research characterizes effective pore scale via circular tube bundle model with due regard for gas adsorption layer thickness on the walls of organic pores and water film thickness on the walls of inorganic pores, and the investigation of shale pore geometry is significant for designing and developing shale gas reservoirs. This work shows that the widely existing shale mesoporous volume with diameter of 2~50 nm accounts for 81% based on experimental testing, then it reduces to about 76% via effective diameter model calculation.
KeywordsShale gas Multi-scale pore Adsorption layer Water film Circular tube bundle
The authors wish to acknowledge anonymous reviewers for constructive comments and suggestions for improving this paper. The authors also wish to thank the anonymous Associate Editor for his handling of the paper and additional suggestions.
This work was supported by the National Natural Science Foundation of China (grant number 51374044).
- Chen Q, Kang YL, You LJ, Yu YF, Liu HL (2013) Micro-pore structure of gas shale and its effect on gas mass transfer. Nat Gas Geosci 6:1298–1304Google Scholar
- Cui JW, Zou CN, Zhu RK, Bai B, Wu ST, Wang T (2012) New advances in shale porosity research. Adv Earth Science 12:1319–1325Google Scholar
- He CZ, Hua MQ (1998) The thickness of water film in oil and gas reservoirs. Pet Explor Dev 2:75–77Google Scholar
- Jia B, Li D, Tsau JS, Barati R (2017) Gas permeability evolution during production in the Marcellus And Eagle Ford shales: coupling diffusion/slip-flow, geomechanics, and adsorption/desorption. SPE/AAPG/SEG Unconventional Resources Technology Conference, 24–26 July, Austin, Texas, USAGoogle Scholar
- Li ZF, Li ZP, Miao LL, Fu YK, Wang Y, Xie S (2013) Gas flow characteristics in nanoscale pores of shale gas. Nat Gas Geosci 5:1042–1047Google Scholar
- Li Y, Li X, Shi J, Wang H, Wu L, Teng S (2014) A Nano-pore scale gas flow model for shale gas reservoir. Soc Pet Eng. https://doi.org/10.2118/169939-MS
- Liu SC, Yan WD (2012) Current situation and enlightenment of world shale gas exploration and development. Land Resour Inf 2:1–6Google Scholar
- Liu DX, Yue XA, Hou JR, Cao JB, Wang LM (2005) Experimental study of adsorbed water layer on solid particle surface. Acta Min Log Sin 1:15–19Google Scholar
- Pan RF, Huang XS (2009) Shale gas and its exploration prospects in China. Chin Pet Explor 3:1–5Google Scholar
- Shi JT, Zhang L, Li YS, Yu W, He XN, Liu N, Li XF, Wang T (2013) Diffusion and flow mechanisms of shale gas through matrix pores and gas production forecasting. doi: https://doi.org/10.2118/167226-MS
- Tian H, Zhang SC, Liu SB, Zhang H (2012) Determination of organic-rich shale pore features by mercury injection and gas adsorption methods. Acta Pet Sin 3:419–427Google Scholar
- Wang XZ (2014) Lacustrine shale gas. Petroleum Industry Press, BeijingGoogle Scholar
- Wang CC, Yao J, Wu KL, Ren GX, Sun H, Yang YF, Gao Y, Chen ZX (2014) Organic and inorganic pore structure analysis in shale matrix with superposition method. Unconventional resources technology conference. doi: https://doi.org/10.15530/URTEC-2014-1922283
- Xiang Y (1999) Tight sandstone gas reservoir water flooding dynamic recovery and rain water depth study. J Chengdu Univ Technol 4:389–391Google Scholar
- Yang F, Ning ZF, Hu CP, Wang B, Peng K, Liu HQ (2013a) Characterization of microscopic pore structures in shale reservoirs. Acta Pet Sin 2:301–311Google Scholar
- Yang F, Ning ZF, Zhang SD, Hu CP, Du LH, Liu HQ (2013b) Characterization of pore structures in shales through nitrogen adsorption experiment. Nat Gas Ind 4:135–140Google Scholar
- Zhao Q, Wang HY, Liu RH, Bai WH, Zhang XW (2008) Global development and China’s exploration for shale gas. Nat Gas Technol 3:11–14Google Scholar
- Zhao B, Shang Y, Jin L, Jia B (2017) Characterizing connectivity of multiscale pore structure in unconventional reservoirs by the complex network theory. SPE/AAPG/SEG Unconventional Resources Technology Conference, 24–26 July, Austin, Texas, USAGoogle Scholar