Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (3): 927-939.doi: 10.13278/j.cnki.jjuese.20200277

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Petrophysical Model for Complex Pore Structure and Its Applications in Tight Sand Gas Reservoirs

Zhang Yiming1, Qin Xiaoying2, Guo Zhiqi2, Niu Cong1, Wang Di1, Ling Yun1   

  1. 1. CNOOC Research Institude Co, Ltd., Beijing 100028, China;
    2. College of GeoExploration Science and Techonology, Jilin University, Changchun 130026, China
  • Received:2020-11-26 Online:2021-05-26 Published:2021-06-07
  • Supported by:
    Supported by the China National Offshore Oil Corporation Research Project (YXKY-2019-ZY-04) and the National Natural Science Foundation of China (42074153)

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Abstract: We conducted rock physical modeling to investigate the effect of complex pore space on elastic properties of tight gas sands. Two ways for the characterization of pore spaces were compared in the rock physical model. The modeling results show that the complex velocity-porosity relationships from well log data can be interpreted by both the two models. The rock physical inversion using well log data shows that compared to the single pore aspect ratio model, the dual-porosity model gives better prediction in shear wave velocity. It reveals that the dual-porosity model may be a more realistic representation of tight sands, and the obtained parameter of the proportion of soft pores can reflect heterogeneity of pore spaces. The proposed rock physical model is used to evaluate elastic modulus of the tight sand dry frame using logging data. Compared with the conventional empirical formulas such as Krief or Pride, this method considers mineralogy, porosity and complex microstructural pore structures,so it is more rigorous to determine the elastic properties of dry frame. The analysis on the obtained results indicates that a small amount of micro-cracks may play an important role in determining elastic behaviors of dry frame of tight sands, and round pores provide the main storage space for gas. The obtained dry frame modulus can be used to calculate many rock physical parameters for formation evaluation such as the Biot coefficient, and provide key parameters for the Gassmann fluids substitution theory and BISQ theory.

Key words: tight gas sandstone, rock physics, pore structure, aspect ratio, fraction of soft pore, dry frame

CLC Number: 

  • P631
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