Brittleness index and seismic rock physics model for anisotropic tight-oil sandstone reservoirs

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• 作者：Xin-Rui Huang ; Jian-Ping Huang ; Zhen-Chun Li ; Qin-Yong Yang…
• 关键词：brittleness index ; tight ; oil sandstone reservoirs ; seismic rock physics model ; brittleness sensitivity ; anisotropy
• 刊名：Applied Geophysics
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：12
• 期：1
• 页码：11-22
• 全文大小：3,030 KB
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• 作者单位：Xin-Rui Huang (1)
  Jian-Ping Huang (1)
  Zhen-Chun Li (1)
  Qin-Yong Yang (2)
  Qi-Xing Sun (1)
  Wei Cui (1)
  
  1. School of Geoscience of China University of Petroleum (East China), Qingdao, 266580, China
  2. Sinopec Geophysical Research Institute, Nanjing, 211103, China
  
• 刊物主题：Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-0658

文摘

Brittleness analysis becomes important when looking for sweet spots in tight-oil sandstone reservoirs. Hence, appropriate indices are required as accurate brittleness evaluation criteria. We construct a seismic rock physics model for tight-oil sandstone reservoirs with vertical fractures. Because of the complexities in lithology and pore structure and the anisotropic characteristics of tight-oil sandstone reservoirs, the proposed model is based on the solid components, pore connectivity, pore type, and fractures to better describe the sandstone reservoir microstructure. Using the model, we analyze the brittleness sensitivity of the elastic parameters in an anisotropic medium and establish a new brittleness index. We show the applicability of the proposed brittleness index for tight-oil sandstone reservoirs by considering the brittleness sensitivity, the rock physics response characteristics, and cross-plots. Compared with conventional brittleness indexes, the new brittleness index has high brittleness sensitivity and it is the highest in oil-bearing brittle zones with relatively high porosity. The results also suggest that the new brittleness index is much more sensitive to elastic properties variations, and thus can presumably better predict the brittleness characteristics of sweet spots in tight-oil sandstone reservoirs.