Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 82-90.doi: 10.12108/yxyqc.20180510

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Inversion of rock physics parameters based on KT model fluid substitution

PENG Da1,2, XIAO Fusen1, RAN Qi1, XIE Bing1, CHEN Xiao1, ZHANG Fuhong1, CHEN Kang1, XU Xiang1   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Company, Chengdu 610015, China;
    2. Post-Doctoral Mobile Station, Southwest Petroleum University, Chengdu 610500, China
  • Received:2017-12-15 Revised:2018-03-02 Online:2018-09-14 Published:2018-09-14

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Abstract: There are many rock physics parameters in rock physics model,some parameters are directly obtained from log data or lab data,and the others are indirectly obtained by inversion,such as mineral matrix elastic modulus and pore geometry. It's important to investigate estimation methods for these rock physics parameters. For the sandstone reservoir,three different pore aspect ratios were used to describe the pore structure of sandstone,Biot's coefficient was used to determine the variation range of mineral matrix elastic modulus,and combined with simulated annealing simulated annealing algorithm,an inversion method for estimating rock physics parameters based on KT model fluid substitution was proposed. The mineral matrix bulk and shear modulus of 42 sandstone samples were inversed,and their pore aspect ratio spectrum were inversed simultaneously. The results show that:pore aspect spectrum has a great effect on rock elastic properties;pore aspect spectrum can be used to depict pore structure and diagenesis;using KT model with three pore aspect ratios to carry out fluid substitution simulation has a good adaptability;percentages of crack pores have a high sensitivity to rock elastic modulus.

Key words: KT model, fluid substitution, rock physics parameters, mineral matrix elastic modulus, pore aspect ratios spectrum

CLC Number: 

  • P315
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