Reservoir Evaluation and Development ›› 2021, Vol. 11 ›› Issue (2): 176-183.doi: 10.13809/j.cnki.cn32-1825/te.2021.02.005

• Shale Gas Exploration • Previous Articles     Next Articles

Evaluation method of Weirong deep shale gas reservoir and its application

ZHOU Hua(),WEI Limin,WANG Tong,WANG Yan,PANG Heqing,ZHANG Tiancao   

  1. Research Institute of Petroleum Exploration and Development, Sinopec Southwest Oil and Gas Company, Chengdu, Sichuan 610041, China
  • Received:2020-10-20 Online:2021-04-30 Published:2021-04-26

Abstract:

The problems of strong longitudinal heterogeneity and difficulties in fine evaluation exist in shale reservoirs from the Wufeng Formation to the first member of Longmaxi Formation in Weirong Shale Gas Field. Therefore, TOC content, gas content, proportion of organic pores, brittle mineral content, clay mineral content, brittleness index and horizontal stress difference coefficient are selected as the key parameters for the shale gas reservoir evaluation, and the gray correlation analysis method is applied to quantitatively characterize reservoir quality based on the characteristics of Weirong deep shale gas reservoirs and their main influencing factors. The results show that: ①By calculating the correlation between evaluation parameters and reservoir quality, it is clear that gas content is the primary parameter to indicate high-quality reservoir. ②By calculating the comprehensive evaluation index of reservoir quality(Q), the reservoir can be divided into four levels, among which the A-level one is mainly bio-siliceous shale and calcium-bearing-clay-siliceous shale, consisting with the target window position of the current horizontal wells, and the research results are in good agreement with development practices. This method realizes the fine evaluation of reservoir quality under the influence of multiple factors, provides the basis for the objective evaluation of high-quality shale reservoirs, and has reference significance for the evaluation and development of similar gas reservoirs.

Key words: Weirong Shale Gas Field, deep shale gas, reservoir evaluation, grey correlation analysis, comprehensive evaluation index

CLC Number: 

  • TE121