Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 98-102.doi: 10.3969/j.issn.1673-8926.2015.03.015

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Prediction technique of high-quality reservoir in tight reservoir of the sixth member of Xujiahe Formation in Jiannan area

ZHANG Shuishan， LIU Yongjiang， LIU Xianhong   

  1.  Geophysical Research Institute of Jianghan Oilfield Company ， Sinopec ， Wuhan 430000 ， China
  • Online:2015-05-26 Published:2015-05-26

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Abstract:

 The tight gas reservoir of the sixth member of Xujiahe Formation which is characterized by sandstone-rich, gas-bearing in whole and local enrichment is favorable area for exploration. The sixth member of Xujiahe Formation is chara-cterized by poor physical properties and relatively thin thickness, which gives birth to similar wave impedance of sandstone reservoirs and mudstones. Thus, it is difficult to use post-stack wave impedance inversion to distinguish reservoir. Prediction technique of high-quality reservoir in tight reservoir has been established by technical research. It includes three steps: firstly, seismic facie models of typical geologic bodies should be summarized from logging information and the macroscopic favorable zones ought to be forecasted by analyzing seismic attributes; secondly, physical properties of different types of rocks such as impedance, Poisson’s ratio and so on are supposed to be analyzed by rock physics modeling, in which the sensitive lithology parameters can be picked out; thirdly, favorable reservoir is able to identified effectively by comprehensive application of multi-parameter inversion and pre-stack inversion. The application of this technique in the sixth member of Xujiahe Formation in the study area proved to have good result and have great application prospects.

Key words:  tight sand, seismic attributes, petrophysics, pre-stack inversion, reservoir prediction

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